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    Wyświetlanie 1-47 z 47
    Tytuł:
    Research of engine pistons form point of view of thermal shocks
    Autorzy:
    Sieminska, B.
    Slawinski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/246075.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    piston engines
    piston composite alloys
    thermal shocks
    temperature measurements
    Opis:
    Experimental test results of thermal shocks for heavy duty pistons of combustion engines are presented in the paper. The range and the level of thermal loads were diverse and dependent from working engine conditions as well as the temperature ranges were adapted for real conditions in which pistons of the combustion engine work. temperature measurement results on crown and skirt of a piston during an engine operating under different conditions are presented in the paper. Measured temperature differences during engine operating were greatest in areas, where appeared greatest piston temperatures. Researches of thermal shocks were realized on the special testing device. The device this is automatic, controlled a computer, makes possible the realization of the cycle of research of thermal shocks in the necessary range of the temperature. Test results showed that in following cycles of thermal shocks took place stable changes ofdimensions ofthe piston too. Mainfactors effecting on the resistance of piston materials on thermal shocks are presented in the paper, at this essential parameters influent on the resistance of materials on thermal shocks are coefficients of thermal expansion and Young's modules. In particular thermal shock resistance of the different piston alloys, dependence of dimensional thermal tensions versus the undimensional heat flux, Basic parameters of the composite material AK12 +20%Al2O3 and standard, values of heat conductivity coefficient the and temperature on the composite piston surface, values of stresses due with the temperature field in piston, values strains in the composite piston due the temperature field, the example of the influence of the number of thermal shocks on the deformation of the piston sample are presented in the paper.
    Źródło:
    Journal of KONES; 2010, 17, 1; 411-420
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnosis modern systems of marine diesel engine
    Autorzy:
    Krakowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/243668.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    technical diagnostics
    diagnostic methods
    piston engines
    cooling systems
    Opis:
    In this paper, in terms of diagnostic tests, functional systems composed of a technical object that is marine diesel engine piston were presented. This decomposition enables the identification of diagnostic systems, where failures occur most frequently and those whose failure may cause serious This decomposition enables the identification of diagnostic systems, where failures occur most frequently and those whose failure may cause serious consequences further consequences. Marine diesel engine was divided into the following functional systems: piston-crank exchange of the working medium, fuel supply, lubrication, cooling, starting, starting and reversing. Operating practice shows that the most common marine engine failure include damage to the injection system, the injectors, injection pumps, fuel system, speed controllers, lubrication system, timing mechanism, as well as the cooling system malfunctions. In this paper, examples of currently used diagnostic systems were described. In addition, the unconventional methods of diagnosing piston engines were presented. These are new, increasingly completely without disassembly and without any interference in the process of the internal combustion engine technical condition testing methods. Measurement systems computerization causes they are used with the simultaneous use of artificial intelligence and especially expert systems. These include, inter alia, vibration analysis, marine engine exhaust gas analysis, acoustic emission, endoscopy and quick photography in research diagnostics. Then infirmities cooling system were presented. The problem of development of methods of diagnosis and diagnostic system for marine diesel engine cooling system was formulated. It has been found that the developed diagnostic system would be a good complement to the existing electronic surveillance systems of the marine engine technical state.
    Źródło:
    Journal of KONES; 2014, 21, 3; 191-198
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of combustion system with semiopen combustion chamber in a commercial spark ignition engine
    Badania systemu spalania z półotwartą komorą spalania w silniku produkcyjnym o zapłonie iskrowym
    Autorzy:
    Leżanski, T.
    Sęczyk, J.
    Wolański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/245775.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    SI engines
    combustion
    combustion chamber of piston engines
    exhaust emission
    Opis:
    During the research of a new combustion system with semi-open combustion chamber for SI engines with use of the rapid compression machine (RCM) and visualisation experimental engine (VEE) it was proved that the application of this system results in shortening of the combustion time, increasing of the maximum cycle pressure and, in effect, increase of the combustion efficiency. The aim of the research using a commercial spark ignition engine was to prove that the similar results (as in RCM and VEE) could be obtained in a wide range of automotive engine operating parameters. In this research the two cylinder, four stroke air cooled SI engine, with volume displacement 650 cm3 from Fiat 126 motorcar was used. This engine was fitted with a modified cylinder head and ignition distributor. Two types ofprechamber with different shape were installed in different locations into the cylinder head but the ignition distributor had fixed, preadjusted, ignition advance angle in the full range of engine speed. The wide open throttle characteristics including power, specific fuel consumption and exhaust emission versus engine speed and load characteristics including: specific fuel consumption and exhaust emission versus engine torque were determined for different ignition advance angles. In the lower range of the ignition advance angle the engine showed stable operation at lower speed but unstable at high speed and, inversely, if the ignition advance angle was high the engine operation was stable at the higher speed and unstable at the lower. The engine characteristics during unstable operation were deteriorating. The research results show that improvement of the engine characteristics can be obtained in the full range of operating parameters ifthe ignition advance angle is varied continuously with the variation of engine speed. The ignition advance angle for the engine fitted with the new combustion system, which was subject of this research, was different form the ignition advance angle for standard engine.
    W badaniach prowadzonych przy zastosowaniu maszyny pojedynczego sprężu oraz badawczego silnika wizualizacyjnego, stwierdzono, że zastosowanie systemu z półotwartą komorą spalania może spowodować: skrócenie czasu spalania w komorze spalania, zwiększenie ciśnienia maksymalnego cyklu oraz zwiększenie sprawności spalania. Celem badAn w silniku produkcyjnym było wykazanie, że takie pozytywne efekty można uzyskać również w szerokim zakresie parametrów pracy trakcyjnego silnika spalinowego. Badania prowadzono przy zastosowaniu silnika samochodu Fiat 126p. W badaniach stosowano dwie różne głowice, w których zainstalowano w różnych miejscach i o różnym kształcie wstępną komore spalania oraz zmodernizowany aparat zapłonowy. Określono charakterystyki zewnętrzne i obciążenlowe przy różnych konfiguracjach komory spalania, różnych wartościach kąta wyprzedzenia zapłonu dla dwóch wartości współczynnika nadmiaru powietrza. W przypadku małych wartości kąta wyprzedzenia zapłonu uzyskiwano poprawę osiągów oraz zmniejszenie toksyczności spalin w zakresie niskich prędkości obrotowych, natomiast silnik pracował niestabilnie w zakresie wysokich prędkości obrotowych i odwrotnie, kiedy stosowano wysokie wartości kąta wyprzedzenia zapłonu uzyskiwano poprawę osiągów w zakresie wysokich prędkości obrotowych, natomiast silnik pracował niestabilnie w zakresie niskich wartości prędkości obrotowych. Uzyskane wyniki pokazują, że dzięki zastosowaniu systemu z półotwartą komorą spalania, o właściwie dobranych parametrach systemu, można uzyskać poprawę osiągów silnika oraz zmniejszenie toksyczności spalin w całym zakresie pracy silnika trakcyjnego
    Źródło:
    Journal of KONES; 2009, 16, 3; 203-211
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of combustion system with semi-open combustion chamber in a commercial spark ignition engine
    Autorzy:
    Leżański, T.
    Sęczyk, J.
    Wolański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/246474.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    SI engines
    combustion
    combustion chamber of piston engines
    exhaust emission
    Opis:
    During the research of a new combustion system with semi-open combustion chamber for SI engines with use of the rapid compression machine (RCM) and visualisation experimental engine (VEE) it was proved that the application of this system results in shortening of the combustion time, increasing of the maximum cycle pressure and, in effect, increase of the combustion efficiency. The aim of the research using a commercial spark ignition engine was to prove that the similar results (as in RCM and VEE) could be obtained in a wide range of automotive engine operating parameters. In this research the two cylinder, four-stroke air-cooled SI engine, with volume displacement 650 cm³ from Fiat 126 motorcar was used. This engine was fitted with a modified cylinder head and ignition distributor. Two types of prechamber with different shape were installed in different locations into the cylinder head but the ignition distributor had fixed, preadjusted, ignition advance angle in the full range of engine speed. The wide-open throttle characteristics including power, specific fuel consumption and exhaust emission versus engine speed and load characteristics including: specific fuel consumption and exhaust emission versus engine torque were determined for different ignition advance angles. In the lower range of the ignition advance angle the engine showed stable operation at lower speed but unstable at high speed and, inversely, if the ignition advance angle was high the engine operation was stable at the higher speed and unstable at the lower. The engine characteristics during unstable operation were deteriorating. The research results show that improvement of the engine characteristics can be obtained in the full range of operating parameters if the ignition advance angle is varied continuously with the variation of engine speed. The ignition advance angle for the engine fitted with the new combustion system, which was subject of this research, was different form the ignition advance angle for standard engine.
    Źródło:
    Journal of KONES; 2016, 23, 4; 283-290
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics of vessel power plants
    Autorzy:
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/247146.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    technical diagnostics
    piston engines
    gas turbine engines
    vessel power plants
    Opis:
    In this paper, the problems of diagnostics of main propulsion marine engines are presented. Diesel or turbine engines are used for main propulsion of vessel power plants. Marine engine is a complex technical object. For the purpose of diagnostics it is convenient to divide the engine into several units - subsystems such as: piston -crank assembly; working medium exchange system, fuel supply system, lubricating system, cooling system, starting up -reversing system; combustion chamber. The organization of the marine engine diagnostic process can usually come down to two stages, general diagnostics and damage location. Most popular in marine engine diagnostics have been the periodic run analyzers, called pressure analyzers, electronic indicators or MIP (Mean Indicated Pressure) calculators. Marine turbine engine operation requires professional technical supervision. The basic diagnostic system of marine turbine engine is able to assess the current engine condition and give forecast concerning its future operation in a complex way with the use of computer technology. Working out operating decision was based on proper preparation of operational parameters which were processed in a computer according to defined algorithms. Diesel engine diagnostic systems of merchant vessel engines are discussed. Finally, description of diagnostic methods implemented in turbine and piston engines in Polish Navy ships are introduced.
    Źródło:
    Journal of KONES; 2011, 18, 2; 41-47
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multidimensional engine starting characteristics
    Autorzy:
    Pszczółkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/949496.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    piston combustion engines
    low temperature starting
    Opis:
    The difficulties in obtaining the start of piston combustion engines increase at low temperature conditions. Lowering abilities of a diesel engine to undertake the independent operating, at low temperature, result from its influence on exploitation materials, engine systems properties, and directly from low ering the temperature of sucked-up into the engine cylinders air. The successful engine start-up depends on three independent parameters: engine (and ambient) temperature, engine crankshaft rotational speed extorted by starting system and the time period at which this system is operating. An individual engine starting abilities measure can be the time of starter motor operating at aparticular temperature or its start-up limit temperature determined according to a specified research standard. The dependence of start-up time or start-up limit temperature on any particular factor is the engine starting characteristic. The combustion engine is a very complex object in respect of its starting abilities. If the engine constructionai adjustment and exploitation parameters are changed, the start-up characteristic (function) is a multi-dimensional function. Formally, from mathematical point of view, it is a surface in a multidimensional space. It is possible to obtain any engine starting characteristic by multidimensional starting surface intersection. In the paper there are presented examples of one- and multi- dimensional diesel engine starting characteristics as results of long-lasting starting tests of many engines.
    Źródło:
    Journal of KONES; 2010, 17, 3; 385-392
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing diagnostic applicability of heat release characteristics determined based on ship engine indicator diagrams
    Autorzy:
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/258814.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship piston engines
    indicator diagrams
    heat release
    characteristics
    diagnostic application
    Opis:
    In order to determine indicator diagrams-based heat release characteristics, a single- zone model of net heat release was used for perfect gas. It was proved that when a constant value for isentropic exponent is assumed, the error in determining the characteristics can be limited to 1% at the nominal load. The effect of errors in determining the position of piston TDC, as well as that of gas passages and indicator valves on the calculated characteristics was evaluated. It was shown that for low-speed engines the effect of gas passages in negligible, while for medium-speed engines the characteristics reveal some deformations (waves), which are repeatable for an individual cylinder in the examined engine construction. The results of the performed investigations and analyses suggest possibility and advisability of the use of heat release characteristics in diagnosing ship engines, in particular low-speed machines.
    Źródło:
    Polish Maritime Research; 2009, 3; 32-35
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field of pressure in zone contact elements assembly PRC stationary quantification
    Autorzy:
    Tkaczyk, M.
    Kaźmierczak, A.
    Kaźmierczak, Ł.
    Górniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246221.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    piston combustion engines
    PRC systems
    CFD
    Opis:
    One of the most common worldwide rubbing couple which performs plane-turning motion is a pair of selling rings - cylinder sleeve of a Piston - Ring- Cylinder (PRC) system of a combustion engine. It explains the necessity of performing investigations concerning the phenomenon occurring in rubbing couple PRC. One of the most important issues is the friction losses as well as losses of the working medium from the combustion chamber. Mathematical models of gas flow in the PRC are described in the literature differ in the way of description and scope of the phenomena taken into account. In this paper approach to determine the flow spaces between the rings considering the effect of the geometry of the PRC system has been proposed. Investigation conducted with aid of CFD (Computational Fluid Dynamics) were aimed on determination of flow resistance within the surface between the piston, rings, and cylinder liner. Aim of the study was achieved - The pressure field. it has been found that it is possible to determine the pressure field in the space of the PRC system basing on the approximation of the generalized transport equations for a discrete geometric model using the finite volume method. The precision of the results depends on the account in the form of boundary conditions as well as external conditions.
    Źródło:
    Journal of KONES; 2011, 18, 3; 463-471
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of a place for the measurement of cylinder pressure of marine piston engine on the indicator diagrams and indicator parameters
    Autorzy:
    Witkowski, Kazimierz
    Wysocki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/241929.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diagnostics
    marine piston engines
    self-ignition engines
    indication
    middle indicated pressure
    combustion pressure
    Opis:
    The article discusses one of the most popular methods of diagnosing selected damages of marine piston engines, which is the indication or measurement of pressure changes in the engine’s combustion chamber. Improving the quality of indicator diagrams may contribute to the increase in the efficiency of using the parameters indicated in the diagnostics of marine piston engines. Measurement errors during engine indication are primarily caused by measuring channels that connect the combustion chamber to the pressure sensor. One way to avoid these errors is to install the pressure sensor directly in the combustion chamber. It seems that it is possible to eliminate these errors. However, there is a risk that the pressure sensor will be damaged by the effect of high temperature on it during combustion of the fuel-air mixture in the engine’s combustion chamber. The article presents the results of tests that indicate that the measured temperatures in the place where the sensor was installed (in the combustion chamber) did not exceed the critical value specified by the pressure sensor manufacturer. The article also presents the results of cylinder pressure measurement not only in the combustion chamber but also in two other points - on the thread of the indicator cock and in the measuring channel between the indicator cock and the cylinder head. The tests were carried out in a wide range of engine load technically efficient and with simulated damage in the fuel injection system. The article presents a comparative analysis of the parameters read out of the indicator diagram for the three abovementioned pressure measurement locations. It was shown that the pressure measurements carried out directly in the combustion chamber are free from errors resulting from the influence of measuring channels and indicator cock.
    Źródło:
    Journal of KONES; 2019, 26, 2; 181-188
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected tribological parameters for silumin alloy used for engine piston
    Autorzy:
    Kozuba, J.
    Wieszała, R.
    Mendala, J.
    Roszak, M.
    Pakieła, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175806.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tribology
    piston engines
    coefficient of friction
    tribologia
    silniki tłokowe
    współczynnik tarcia
    Opis:
    Purpose: The conducted tests were aimed at determining whether the tested material meets the requirements for wear resistance in modern turbocharged combustion engines where there is an increased temperature and higher pressure. Design/methodology/approach: The tests were performed in a pin-on-disc system, according to the ASTM G 99 standard. Findings: The article presents the results of the coefficient of friction, the amount of wear, chemical analysis and surface profile of the tested material A390.0 in combination with EN GJL-350 cast iron. Research limitations/implications: The tested materials are used in the construction of pistons for internal combustion engines, therefore the test parameters were selected to take into account the operating conditions in a turbocharged engine with a power of up to 100 kW. Practical implications: After analysing the properties of the A390.0 alloy at elevated temperatures, it was found that without additional modifications, the alloy cannot be used in modern combustion engines, in particular with turbocharging. Originality/value: Presents the results of research concerning mechanical properties (HB, HV, Rm) and yield properties (R0.2, A5, Z) of the examined alloy.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 107, 2; 64--71
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of aircraft powerplants icing possibility in Poland
    Analiza możliwości wystąpienia oblodzenia lotniczych zespołów napędowych w warunkach polskich
    Autorzy:
    Chachurski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/243354.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    lotnictwo
    zespoły napędowe
    silniki turbinowe
    silniki tłokowe
    aeronautics
    power plants
    gas turbine engines
    piston engines
    Opis:
    Oblodzenie statków powietrznych i ich zespołów napędowych stanowi wciąż istotne zagrożenie dla bezpieczeństwa wykonywania lotów. W określonych warunkach lód może tworzyć się na elementach wlotu, żebrach, łopatach kierowniczych i wirnikowych sprężarek silników turbinowych, a także wewnątrz układów dolotowych silników tłokowych. Ponadto, w wypadku turbinowych zespołów napędowych wywołany oblodzeniem wybuch cieplny może doprowadzić do samoczynnego wyłączania się silników. Analiza danych meteorologicznych z polskiej przestrzeni powietrznej w latach 2004-2006 pokazuje, że dla silników turbinowych oblodzenie jest szczególnie groźna zimą, wiosną oraz późną jesienią. Z kolei silniki tłokowe są narażone na intensywne oblodzenie w każdej fazie lotu w porze nocnej oraz o poranku niemal przez cały rok. Podobnie jest w porze dziennej, przy czym w miesiącach letnich spada zagrożenie w każdej fazie lotu, ale wzrasta możliwość wystąpienia silnego oblodzenia podczas zniżania. Paradoksalnie najwięcej dni, w których zagrożenie oblodzeniem jest mniejsze występuje w miesiącach zimowych, wówczas, gdy temperatura otoczenia spada poniżej -5 stopni Celsjusza. Analiza wyników uzyskanych dla silników turbinowych pozwala na stwierdzenie, że w czasie nocy zagrożenie oblodzeniem może wystąpić przede wszystkim od stycznia do kwietnia dla samolotów szybkich i śmigłowców. Zagrożenie dla samolotów F-16 może wystąpić od października do maja. Natomiast dla samolotów pasażerskich i szkolno-treningowych zagrożenie pojawia się w miesiącach zimowych. W czasie dnia oblodzenie może wystąpić głównie zimą, wczesną wiosną i późną jesienią.
    Icing of aircrafts and their powerplants is essential danger for safety of flights. At specific conditions ice may form itself on elements of inlet, ribs, vanes and blades of compressors of gas turbine engines or inside induction systems of piston engines and on propellers. Moreover, heat explosion due icing may give rise to flameout of gas turbine engines. Analysis of meteorological data from the Polish airspace from 2004-2006 years shows, that for gas turbine engines icing is the most danger in winter, spring and late autumn. Piston engines risk due icing are high during all flight at night and at early morning almost all year. Similar risk is at day time, although risk during all flight is lower in summer, but during descent and approach is higher. It is a paradox that the fewest days with low risk for piston engines icing are in winter, when an air temperature is lower than -5 centigrade. The analysis of results obtained for turbine-engines lets on statement that during the night threat of icing can appear first of all from January to April for high-speed planes and helicopters. Danger for F-16 planes can appear from October to May. However for passenger aeroplanes and of school-of training threat appears in winter-months. During the day the icing can appear mostly in the wintertime, early spring and backdrop.
    Źródło:
    Journal of KONES; 2007, 14, 3; 131-138
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of marine piston engine injectors dynamic state for the non-invasive diagnostics purpose
    Autorzy:
    Dudziński, M.
    Kluczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315948.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    wtryskiwacze
    wibracje
    okrętowe silniki tłokowe
    stan techniczny
    injectors
    vibrations
    marine piston engines
    technical state
    Opis:
    The paper presents results of measurements conducted during multi-stage studies on injectors of WOLA 72H6 engine. The research was conducted to determine the technical condition of the injectors during their operation. As a result of the injector modeling in the CAD environment, the resonant frequencies of the examined element were obtained. The next stage of the study was a stand-alone tests with the simultaneous recording of vibration parameters. The aim of records was to link the vibration parameters with the technical condition of the tested injectors. The study series was finished with measurements on a real object test stand.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 487-493
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison the piston air engine performance with aviation gasoline (Avgas) or the E-85 ecological fuel supply
    Autorzy:
    Balicki, W.
    Irzycki, A.
    Snopkiewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/243897.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    nternal combustion engine
    piston air engines
    ecological fuels
    exhaust pollutant
    Opis:
    The fuel presently used for feeding of aircraft piston engines (petrol including TEL) is characterized by "strong unfriendliness" for environment. Many research centres have been going on fuels investigation, which could substitute Avgas utilized in aviation. This is why are there no being in force for Europe standards defining the allowable emission of pollutions in exhaust gases of aircraft piston engines (equivalent to EURO - standards introduced for traction engines). The mixtures of gas o line and alcohols are tested as "alternative" aircraft fuels for spark ignition engines, and in case of Diesel engines - evenjet kerosene. During the research works on test bed carried out at Institute of Aviation the performance offour-stroke aircraft carburettor piston engine supplied by "classical" aircraft petrol and the E - 85 fuel (mixture of petrol and ethanol) were compared. Except for measuring the functional parameters of engine (rotational speed, torque, specific fuel consumption, pressures and temperatures) the emissions of gaseous pollutants incorporated in exhaust gas were measured and analyzed. The range of modifications of engine supply system - necessary to introduce in case of changing of fuel type within the tested engine -was worked up. There are foreseen comparative test of fuelling the engine with mixtures of petrol and alcohols in different proportions in the next phase of research works.
    Źródło:
    Journal of KONES; 2010, 17, 3; 25-32
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the injection timing on the performance of two-stroke opposed-piston diesel engine
    Autorzy:
    Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/117835.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    diesel engine
    opposed piston engines
    two-stroke engine
    injection timing
    silnik wysokoprężny
    przeciwstawne silniki tłokowe
    silnik dwusuwowy
    czas wtrysku
    Opis:
    The performance of the engine strongly depends on the parameters of the combustion process. In compression ignition engines, the fuel injection timing has a significant influence on this process. The moment of its occurrence and its duration should be chosen so that the maximum pressure value occurs several degrees after TDC. In order to analyze the effect of the fuel injection timing on the performance of the tested two-stroke opposed-piston diesel engine, a zero-dimensional model was developed in the AVL BOOST program. Next, a series of simulations were performed based on the defined calculation points for maximum continuous power, which resulted in power, specific fuel consumption and mean in-cylinder pressure. Finally, the engine map was made as a function of the start of combustion angle.
    Źródło:
    Applied Computer Science; 2018, 14, 2; 69-81
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of susceptibility to icing of aircraft piston engine ROTAX 447 UL SDCI
    Badania podatności na oblodzenie lotniczego silnika tłokowego ROTAX 447 UL SCDI
    Autorzy:
    Chachurski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/241707.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    lotnictwo
    zespoły napędowe
    silniki tłokowe
    bezpieczeństwo lotu
    oblodzenie układów dolotowych
    aviation
    power plants
    piston engines
    safety of flights
    induction icing
    Opis:
    Icing of aircrafts and their powerplants is essential danger for safety of flights and is at the bottom of many more or less serious aviation incidents and accidents in Poland and worldwide. Icing of induction systems of aircraft piston engines is caused by water contained in the air, by vapour of water contained in the air and by fuel vaporising. Experimental investigations of the temperature changing in characteristic points of induction systems of piston engine Rotax 447 UL SDCI equipped with slide carburettor BING 54/36, which have been made in the Institute of Aviation Technology of Military University of Technology, show that these temperatures strongly depend on the inlet flow conditions and are significantly below the ambient air temperature. Results of measurements, which have been made in different conditions, show that the temperature in induction systems may drop up to 16-31oC compared to the external air temperature. This high temperature drop is caused mainly by process of vaporising fuel sprayed to the carburettor. Effects of acceleration of the air in the carburettor Venturi or between the throttle and carburettor walls are minor. Similar results have been obtained for the carburettor Walbro WB-37 with butterfly throttle and for the carburettor CVK-50 with variable Venturi and butterfly throttle. No induction icing has been observed, despite severe icing potential appropriate icing risk diagram.
    Oblodzenie statków powietrznych i ich zespołów napędowych stanowi istotne zagrożenie dla bezpieczeństwa lotów i jest przyczyną wielu bardziej lub mniej zdarzeń i wypadków lotniczych w Polsce i na świecie. Oblodzenie układów dolotowych lotniczych silników tłokowych jest wynikiem oddziaływania wody i pary wodnej zawartej w powietrzu atmosferycznym oraz, przede wszystkim, odparowywania paliwa. Przeprowadzone w Instytucie Techniki Lotniczej Wojskowej Akademii Technicznej badania rozkładu temperatury w charakterystycznych punktach układu dolotowego silnika tłokowego Rotax 447 UL SDCI wyposażonego w gaźnik BING 54/36 z przepustnicą tłokową pokazały, że temperatury te są znacznie niższe od temperatury otoczenia. Wyniki pomiarów przeprowadzanych w różnych warunkach pokazują, że temperatura w układzie dolotowym tego silnika spada o 16-31oC w stosunku do temperatury powietrza. Tak duży spadek temperatury jest przede wszystkim wynikiem odparowywania paliwa zasysanego z rozpylaczy do kanału przepływowego gaźnika. Wpływ przyspieszania strumienia powietrza w gardzieli gaźnika i między ściankami przepustnicy a ściankami kanału przepływowego jest znacznie mniejszy. Podobne wyniki uzyskano dla innych przebadanych gaźników: Walbro WB-37 z przepustnicą uchylną i podciśnieniowego gaźnika CVK-50. W trakcie badań nie zaobserwowano objawów oblodzenia układu dolotowego silnika, mimo, iż zgodnie z diagramem służącym do określania zagrożenia oblodzeniem, warunki były sprzyjające.
    Źródło:
    Journal of KONES; 2008, 15, 4; 73-80
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of susceptibility to icing of aircraft piston engine Rotax 447 UL SDCI9
    Badania podatności na oblodzenie lotniczego silnika tłokowego ROTAX 447 UL SCDI
    Autorzy:
    Chachurski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/248075.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    lotnictwo
    zespoły napędowe
    silniki tłokowe
    bezpieczeństwo lotu
    oblodzenie układów dolotowych
    aviation
    power plants
    piston engines
    safety of flights
    induction icing
    Opis:
    Icing of aircrafts and their powerplants is essential danger for safety off lights and is at the bottom of many more or less serious aviation incidents and accidents in Poland and worldwide. Icing of induction systems of aircraft piston engines is caused by water contained in the air, by vapour of water contained in the air and by fuel vaporising. Experimental investigations of the temperature changing in characteristic points of induction systems of piston engine Rotax 447 UL SDCI equipped with slide carburettor BING 54/36, which have been made in the Institute of Aviation Technology of Military University of Technology, show that these temperatures strongly depend on the inlet flow conditions and are significantly below the ambient air temperature. Results of measurements, which have been made in different conditions, show that the temperature in induction systems may drop up to 16-31oC compared to the external air temperature. This high temperature drop is caused mainly by process of vaporising fuel sprayed to the carburettor. Effects of acceleration of the air in the carburettor Venturi or between the throttle and carburettor walls are minor. Similar results have been obtained for the carburettor Walbro WB-37 with butterfly throttle and for the carburettor CVK-50 with variable Venturi and butterfly throttle. No induction icing has been observed, despite severe icing potential appropriate icing risk diagram.
    Oblodzenie statków powietrznych i ich zespołów napędowych stanowi istotne zagrożenie dla bezpieczeństwa lotów i jest przyczyną wielu bardziej lub mniej zdarzeń i wypadków lotniczych w Polsce i na świecie. Oblodzenie układów dolotowych lotniczych silników tłokowych jest wynikiem oddziaływania wody i pary wodnej zawartej w powietrzu atmosferycznym oraz, przede wszystkim, odparowywania paliwa. Przeprowadzone w Instytucie Techniki Lotniczej Wojskowej Akademii Technicznej badania rozkładu temperatury w charakterystycznych punktach układu dolotowego silnika tłokowego Rotax 447 UL SDCI wyposażonego w gaźnik BING 54/36 z przepustnicą tłokową pokazały, że temperatury te są znacznie niższe od temperatury otoczenia. Wyniki pomiarów przeprowadzanych w różnych warunkach pokazują, że temperatura w układzie dolotowym tego silnika spada o 16-31oC w stosunku do temperatury powietrza. Tak duży spadek temperatury jest przede wszystkim wynikiem odparowywania paliwa zasysanego z rozpylaczy do kanału przepływowego gaźnika. Wpływ przyspieszania strumienia powietrza w gardzieli gaźnika i między ściankami przepustnicy a ściankami kanału przepływowego jest znacznie mniejszy. Podobne wyniki uzyskano dla innych przebadanych gaźników: Walbro WB-37 z przepustnicą uchylną i podciśnieniowego gaźnika CVK-50. W trakcie badań nie zaobserwowano objawów oblodzenia układu dolotowego silnika, mimo, iż zgodnie z diagramem służącym do określania zagrożenia oblodzeniem, warunki były sprzyjające.
    Źródło:
    Journal of KONES; 2008, 15, 3; 59-66
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowoczesne stanowisko do badań strategii sterowania i zasilania współczesnych silników o ZI
    Modern experimental set-up for investigations into strategies for the control and fueling of spark ignition engines
    Autorzy:
    Ambrozik, A.
    Ambrozik, T.
    Kurczyński, D.
    Łagowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/133511.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    tłokowy silnik spalinowy
    wskaźniki pracy silnika
    badania hamowniane
    paliwa silnikowe
    internal combustion piston engines
    engine operation parameters
    bench tests
    engine fuels
    Opis:
    Tłokowym silnikom spalinowym stawiane są coraz większe wymagania, których celem jest ograniczenie ich szkodliwego wpływu na środowisko naturalne co jednocześnie stymuluje kierunki rozwoju silników spalinowych. W przypadku silników o zapłonie iskrowym dotyczy to przede wszystkim ograniczenia emisji tlenków azotu oraz tlenków węgla i węglowodorów. Ograniczenie emisji szkodliwych składników spalin przez te silniki uzyskuje się między innymi poprzez zastosowanie skomplikowanych układów oczyszczania splin. W ostatnich latach obserwuje się zainteresowanie także paliwami alternatywnymi a przede wszystkim - gazowymi jak LPG czy CNG. Jest to związane także z malejącymi światowymi zasobami ropy naftowej. W artykule przedstawiono wyniki hamownianych badań silnika o zapłonie wymuszonym Fiat 0.9 TwinAir produkowanego w Bielsku Białej przez Firmę Fiat Powertrain Technologies Poland . Podczas badań silnik zasilano standardową benzyną 95 oktanową oraz gazem LPG. Badania przeprowadzono na stanowisku hamownianym wyposażonym w hamulec elektrowirowy EMX–100/10000 zbudowanym w Laboratorium Silników Cieplnych Politechniki Świętokrzyskiej. Zakres badań obejmował wyznaczenie wskaźników ekonomiczno-energetycznych i ekologicznych silnika takich jak stężenia NOx, HC, CO i CO2 w spalinach przy pracy silnika według zewnętrznej charakterystyki prędkościowej i przy jego fabrycznych ustawieniach regulacyjnych.
    Internal combustion piston engines have to comply with increasingly stricter requirements which are intended to limit their detrimental effect on the natural environment. At the same time, however, those provide a stimulus for the development of internal combustion engines. For positive ignition engines, the requirements primarily concern reduction in the emissions of nitrogen oxides, carbon oxides and hydrocarbons. In those engines, decreased emissions of the harmful components of the exhaust gas are achieved, among others, by complex exhaust aftertreatment systems. In recent years, increased interest in alternative fuels, mainly LPG or CNG, is observed. That is also related to the depletion of crude oil resources. The paper presents the results of the bench tests on Fiat 0.9 TwinAir positive ignition engine produced in Bielsko Biała by Fiat Powertrain Technologies Poland. In the tests, the engine was fuelled by regular 95-octane petrol and by LPG. The tests were performed at the bench equipped with the AMX 100 eddy current brake, constructed at the Heat Engine Laboratory of the Kielce University of Technology. The test range included the determination of economic, energy and environmental parameters of the engine, including NOx, HC, CO i CO2 concentrations in the exhaust gas when the engine operated at full load and had factory settings for control.
    Źródło:
    Combustion Engines; 2015, 54, 3; 1030-1035
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of undesirable events in operation of bulk carriers
    Autorzy:
    Monieta, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/245847.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    bulk carriers
    functional systems
    elements
    adverse events
    piston marine diesel engines
    Opis:
    This paper describes the introduced results of researches of undesirable events at one shipowner for a period of twelve years. The study included mostly merchant vessels bulk carriers and their significant objects. The ships were decomposed on functional systems and elements also divided them into of the navigation and machinery part. There was carried out a quantitative and economics analysis. In the economic analysis have been exchange rates accounted. Attempted classification of the causes of the event and its participation in material losses incurred. These events are also a threat to human life and health as well as the natural environment. One showed on methods and means of diagnostics as manner of limitation their sizes and results. The results should be useful in the design of diagnostic experiments to select the objects that should be subject monitored. The larges losses of adverse events were initiated in the functional systems: navigation, main drive and cargo. The most often adverse events are collisions. The most expensive vessel objects in the engine room proved to be reciprocating internal combustion engines for main propulsion and auxiliary. The investigations were conducted for all types of reciprocating internal combustion engines mounted on the test vessels. Combustion engines were operated under different external and internal conditions and were feed distillate and residual fuel oils.
    Źródło:
    Journal of KONES; 2013, 20, 2; 291-297
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological indicators of the perkins 1104D-e44TA engine after its adaptation for being powered with natural gas and diesel fuel
    Autorzy:
    Kurczyński, D.
    Łagowski, P.
    Warianek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/244009.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    piston combustion engines
    engine fuels
    harmful exhaust gases components
    bi-fuelling
    natural gas
    experimental tests
    Opis:
    The contemporary progress of automotive industry and transportation is determined to a large extent by the increasing environmental requirements, aimed at limiting the harmful impact of vehicles upon human life and people’s health. A crucial issue linked with operating vehicles is the exhaust gases generated by internal combustion engines. In order to reduce this hazardous impact upon the natural environment, the construction of the engines is continuously improved, electronic controlling is being developed for managing the course of working processes taking place in cylinders and auxiliary systems, exhaust gases cleaning systems are being developed, alternative fuels are being sought for and the possibilities of their optimal use are being examined. Natural gas is the fuel that is highly expected and hoped to be used more widely for powering internal combustion engines in vehicles. This article presents the values of selected ecological indicators of the Perkins 1104D-E44TA Diesel engine, powered by compressed natural gas and Diesel fuel (CNG + ON). For comparison reasons, the engine was powered with both fuels at the same time and then only by Diesel fuel (ON) in the same working conditions. Before the tests, the powering system control unit had been calibrated so as to enable obtaining similar values of torque while the engine was powered with the Diesel fuel only and with both CNG and ON while working with external speed characteristics; the calibration was also set up to allow for the maximum share of the natural gas in the total fuel amount supplied into the engine cylinders without engine knocking. When powering the engine with both CNG and Diesel fuel, the concentration levels of nitric oxides and carbon dioxide in exhaust gases were lower. However, the total content of hydrocarbons in the exhaust gases grew multiple times, and the content of the carbon monoxide was significantly increased. In addition, the obtained measurement results of the smokiness of the exhaust gases and the content of the soot with the engine powered with two fuels were not satisfactory.
    Źródło:
    Journal of KONES; 2017, 24, 3; 143-150
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential possibilities for biocomponents usage in aircraft fuels for piston and turbine engines
    Potencjalne możliwości zastosowania biokomponentów w silnikach lotniczych
    Autorzy:
    Pągowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/213515.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    zastosowanie biokomponentów
    silniki lotnicze
    biocomponents usage
    aircraft fuels
    piston and turbine engines
    Opis:
    Paper presents possibilities of biological components usage in aircraft fuels for piston and turbine engines, considering serious developments in that matter from the USA, Brazil and Germany. In his work, paper's author refers to Institute of Aviation contacts with leading world biofuels research centers, as Baylor University Renewable Aviation Fuels Development Center in Texas, USA, European Union coordinating action of 6th Scientific Program Aeronet III, and latest developments of Embraer Company. Paper suggests necessity of starting biofuels implementation program for Polish aviation. It seems, that Poland, potentially one of the largest biofuel producers in Europe, for economic, ecologic and technical reasons should undertake this strategic challenge, more about it in the article.
    Przedstawiono możliwości zastosowania biokomponentów w paliwach lotniczych do silników tłokowych i turbinowych, uwzględniając poważniejsze osiągnięcia w tym względzie między innymi z USA, Niemiec, Brazylii. Autor publikacji opiera się przy tym o kontakty Instytutu Lotnictwa z czołowymi ośrodkami światowymi wprowadzającymi biopaliwa jak Centrum Rozwoju Lotniczych Paliw Odnawialnych Uniwersytetu Baylor w Teksasie, akcji koordynacyjnej 6 Programu Naukowego Unii Europejskiej Aeronet III a także ostatnie osiągnięcia firmy Embraer. Artykuł proponuje podjęcie wdrażania biokomponentów do polskiego lotnictwa. Wydaje się, ze Polska potencjalnie jeden z największych producentów biopaliw w Europie powinna podjąć to strategiczne wyzwanie z wielu względów ekonomicznych, ekologicznych i technicznych, o czym pokrótce w artykule.
    Źródło:
    Prace Instytutu Lotnictwa; 2005, 4 (183); 65-69
    0509-6669
    2300-5408
    Pojawia się w:
    Prace Instytutu Lotnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the possible increasing of efficiency of ship power plant with the system combined of marine diesel engine, gas turbine and steam turbine in case of main engine cooperation with the gas turbine fed in parallel and the steam turbine
    Autorzy:
    Dzida, M.
    Mucharski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/258706.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine power plants
    combined systems
    piston internal combustion engines
    gas turbine
    steam turbine
    Opis:
    The article presents a concept of a combined large-power ship propulsion system, composed of the leading internal combustion main engine associated with a power gas turbine and the steam turbine system, both utilising the energy taken from the main engine exhaust gas. In the examined variant the power turbine, arranged in parallel with a turbocharger, is fed with the exhaust gas from the exhaust manifold. A calculation algorithm is presented, along with sample calculations for particular subsystems: supercharging, gas power turbine, and steam turbine system. Assumptions were formulated for the calculations, and were complemented by the adopted limits. Selected system parameters were confronted with the experimental investigations available in the literature. The performed power optimisation of the entire combined marine power plant took only into account the thermodynamic point of view, leaving aside technical and economic aspects. The numerical calculations were performed for the 52 MW low-speed marine diesel engine.
    Źródło:
    Polish Maritime Research; 2009, 2; 40-44
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Baza danych o tłokowych silnikach okrętowych produkowanych w H. Cegielski Poznań S. A. i ZUT Zgoda
    A database of piston marine diesel engines produced in H. Cegielski Poznań S. A. and ZUT Zgoda
    Autorzy:
    Monieta, J.
    Sendecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/132989.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    tłokowe silniki okrętowe
    producenci w Polsce
    parametry techniczne
    baza danych
    piston marine engines
    producers in Poland
    technical parameters
    database
    Opis:
    W czasie prac badawczych dotyczących tłokowych silników spalinowych często potrzebne są dane techniczne tych obiektów. Dane te są zwykle rozproszone i dotarcie do niektórych jest utrudnione lub niemożliwe. Opracowano, zatem elektroniczną bazę danych o najważniejszych producentach okrętowych tłokowych silnikach spalinowych dla potrzeb badań eksploatacyjnych w celu zgromadzenia niezbędnych informacji. W tej pracy przedstawiono bazę danych głównych polskich producentów okrętowych tłokowych silników spalinowych. Informacje zostały pozyskane z różnych źródeł, takich jak: strony internetowe producentów, katalogi reklamowe, książki i czasopisma o tematyce związanej z okrętowymi silnikami spalinowymi. Informacje te zostały zebrane i zapisane przy pomocy programu Microsoft Office. Zgromadzone dane podzielono na silniki napędu głównego i pomocnicze, zawierający dane o producentach, typach i parametrach silników dwusuwowych i czterosuwowych. Baza umożliwia uzupełnianie i modyfikację wprowadzonych danych. Wyprodukowane silniki eksploatowane są zwykle przez kilkadziesiąt lat po wytworzeniu na obiektach pływających.
    During research works concerning piston internal-combustion engines specifications of these objects are often needed. This data is usually dispersed and reaching to some is hampered or impossible. And so an electronic database was drawn up about the most important ship's producer’s piston internal-combustion engines for needs of exploitation investigations in the destination of gathering the necessary information. At this work a database of main Polish producers of marine diesel engines was presented. Information was obtained from various sources, so as: websites of producers, advertising catalogues, or books and magazines about subject matter associated with marine diesel engines. This information was collected and written with the help of the program Microsoft Office. Gathered data was divided in engines of the main drive and emergency, containing details about producers, types and parameters of 2-stroke engines and four-stroke. The base enables supplementing and the alteration of entered data. Produced engines are usually operated by several dozen years after producing on swimming objects.
    Źródło:
    Combustion Engines; 2015, 54, 3; 278-285
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modyfikacja układu do pomiaru przebiegu ciśnienia spalania okrętowego silnika tłokowego Sulzer AL25/30
    Modification of the System for Measuring Combustion Pressure in the Ship Piston Engine Sulzer AL25/30
    Autorzy:
    Wysocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/342392.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
    Tematy:
    indykowanie
    wykresy indykatorowe
    średnie ciśnienie indykowane
    maksymalne ciśnienie spalania
    ciśnienie cylindrowe
    diagnostyka
    okrętowe silniki tłokowe
    indication
    indicator diagrams
    average indicated pressure
    maximum combustion pressure
    cylinder pressure
    diagnostics
    marine piston engines
    Opis:
    Artykuł przedstawia wybrane problemy analizy przebiegów ciśnień cylindrowych w okrętowych silnikach tłokowych. Prawidłowo sporządzony i przeanalizowany wykres indykatorowy pomaga w formułowaniu wniosków diagnostycznych, za pomocą których można doprowadzić do optymalnej, pod kątem ekonomicznym i ekologicznym, regulacji silnika okrętowego. Pomiary ciśnień cylindrowych zaliczane są do trudnych, a także obarczonych wieloma błędami, dlatego też głównym tematem artykułu jest przedstawienie nowej koncepcji pomiarów przebiegów ciśnień cylindrowych.
    The article presents selected problems regarding the correct analysis of cylinder pressures in ship piston engines. Correctly prepared and the analyzed indicator diagram helps in formulating appropriate diagnostic conclusions, with the help of which it is possible to achieve the optimal, in economic and environmental terms, regulation of the ship's engine. Cylinder pressure measurements are classified as difficult and also burdened with many errors. Therefore, the main topic of the article is to present a new concept for cylinder pressure measurements.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Gdyni; 2018, 108; 168-180
    1644-1818
    2451-2486
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Gdyni
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie gliceryny do zasilania tłokowych silników wysokoprężnych dużej mocy
    Application of glycerine for powering piston diesel engines of large power
    Autorzy:
    Rychlik, A.
    Kibalczyc, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/133915.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gliceryna
    spalanie gliceryny w tłokowych silnikach spalinowych
    emisja zanieczyszczeń gazowych
    glycerine
    glycerine combustion in piston combustion engines
    gaseous pollution emission
    Opis:
    Na całym świecie produkcja gliceryny jest coraz większa ze względu na stale rosnące zapotrzebowanie na biodiesla. Na każdą tonę wyprodukowanego biodiesla uzyskuje się 100-110 kg gliceryny, jako produktu ubocznego. Istnieje wiele metod i sposobów wykorzystania powstałej gliceryny, począwszy od przetwarzania jej na inne produkty w przemyśle farmaceutycznym, chemicznym itp., poprzez dodawania jej do paliw czy bezpośredniego spalania w silnikach spalinowych. W przypadku bezpośredniego spalania gliceryny w tłokowych silnikach wysokoprężnych występuje problem niskiej liczby cetanowej paliwa glicerynowego, która utrudnia proces spalania w silnikach spalinowych. W artykule przedstawiona została metoda spalania gliceryny w silniku wysokoprężnym, bez potrzeby stosowania paliwa pilotażowego lub dodatków poprawiających wartość cetanową gliceryny jako paliwa. Przedstawione zostaną ponadto, wyniki badań eksploatacyjnych emisji zanieczyszczeń gazowych i wielkości zużycia paliwa agregatu prądotwórczego składającego się z silnika MTU V652 i prądnicy AvK typ DIDB140, zasilanego paliwem w postaci oleju napędowego oraz gliceryną techniczną 98,5% obciążonego mocą do 1200 kW.
    All over the world glycerine production is growing due to continuously increasing demand for biodiesel. For every ton of produced bio-diesel 100-110 kg of glycerine is obtained as a by-product. There is many methods and ways of use of the obtained glycerine, beginning with processing it into other products in pharmaceutical industry, chemical industry and others, through adding it to fuels or direct combustion in engines. In case of direct combustion of glycerine in piston diesel engines there exists a problem of the low cetane number of glycerine fuel which makes difficult burning it in combustion engines. The paper will present the method of glycerine combustion in a diesel engine with-out necessity of using pilot fuel or additives improving the cetane number of a fuel in the form of glycerine. Additionally, there will be presented the results of the operational research of gaseous pollution emission and fuel consumption by the electric power generator consisting of: MTU V652 engine and AvK DIDB140 generator powered by diesel oil and 98.5 % technical glycerine. The unit was loaded up to 12000 kW power.
    Źródło:
    Combustion Engines; 2015, 54, 3; 644-648
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some effects of applying a new type of pistons for SU12-U diesel engine
    Autorzy:
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246313.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engines
    compression ignition engines
    exhaust emissions
    combustion engine piston
    piston materials
    testing of combustion engines
    Opis:
    In the task of research and development of internal combustion engines, the strong emphasis is placed on reducing emissions of harmful substances in exhaust gases, which include carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NOx), particulate matter (PM, PN); while maintaining a high engine performance and, above all, adequate: power, fuel consumption, noise. One of the possibilities to reduce emissions of HC and engine working noise is to reduce the clearance between the piston and the cylinder liner. This is possible only, when the permanent deformations of the piston are reduced, which result from rapid piston temperature changes (thermal shocks). The newly developed composite aluminum alloy is characterized by high strength parameters and low dimensional hysteresis during repeated heating and cooling. The S12-U engine pistons are made of this material, and they had a slightly larger nominal diameter than the standard pistons. They were then mounted in the engine. The engine was tested on a test stand with the modern, accurate measuring equipment. Test results show, that the HC and CO content in the exhaust gas has been reduced, exhaust gas blowby to the crankcase declined, smoke emission was reduced and engine lubricating oil consumption was also reduced. Analysis of test results indicates that this has been achieved, mainly by reducing the clearances between the piston and the cylinder. The article provides detailed test results, mainly in the form of charts, on which one can compare the results, achieved by the engine with new material pistons with results of the same engine, but with the standard pistons.
    Źródło:
    Journal of KONES; 2016, 23, 4; 167-174
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The numerical calculation module for piston rings
    Autorzy:
    Kaźmierczak, A.
    Tkaczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/245797.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    tribology
    piston ring
    bearing surface
    simulation
    combustion engines
    Opis:
    The piston with piston rings and bearing surface is a self-contained and highly complex tribological system. One of the most widespread global friction pairs traversed by reciprocating a pair of ring - cylinder liner piston - rings - cylinder internal combustion engine. Group PRS combustion engine is the solution generating considerable friction. Various researchers estimate the share of friction losses, per node piston rings - cylinder liner, at 19 to 60% of the total friction losses in the combustion engine. This paper describes part of a larger program to reduce wear the set working parts (piston, piston ring and bearing surface). The project is implemented through the development of new designs of piston rings with anti-wear coating that contains synthetic diamond in the form of loose embedded in a coating of chromium (PRS). The aim of the authors was to present the methodology used to compute characterized by a particular procedure. In practical use FEM software is used and the FVM. Developed and implemented Piston Rings Calculation Module is compatible with the idea of numerical computational methods is to say: functionally consists in carrying out a calculation of the desire to achieve the exact solution (the nearest is real) by conducting and receiving intermediate solutions (the next).
    Źródło:
    Journal of KONES; 2015, 22, 3; 301-307
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research results of novel composite materials with low hysteresis during heating and cooling for pistons of combustion engines
    Autorzy:
    Sieminska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/245037.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engines
    engine piston
    thermal expansion
    emissions
    Opis:
    Research results of novel silumins on pistons for combustion engines, which have high mechanical properties within the range of piston higher operating temperatures, 100-300°C, are presented in the paper. Silumins contain enlarging concentration of the nickel and copper alloy additives up to 4.0, and chrome and molybdenum alloy additives up to 1.0%. Occurrence of given microstructure in piston-silumins results in almost the same values of the coefficient thermal expansion during the heating up to the 300 °C temperature and during the next cooling into the ambient temperature. Small values of the coefficient of expansion of thermal and small differences between values of the coefficient of thermal expansion during heating and cooling enable on application of small values of working clearances between piston and the cylinder liner. As a consequence they make possible, the low exhaust emission level, and the low noise level. The pistons from alloys with small values ofthe coefficient of thermal expansion, small differences of this coefficient during heating and cooling are novel aspects presented in paper. Research results of strength and metallographic parameters, research results of the coefficient of thermal expansion, comparative engine research results are represented in the paper. In particular representative chemical components for a standard alloy and novel alloy, mechanical properties investigated alloys after solution heat treatment, wear resistance of novel alloy compared with two cast irons, ATD curves, fibrous construction, silicon construction, microstructure of novel alloy, courses of changes of the coefficient of thermal expansion in the function of the temperature during heating and cooling are presented in the paper.
    Źródło:
    Journal of KONES; 2010, 17, 1; 421-432
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania wpływu rozruchu i jakości olejów silnikowych na zużycie pierścieni tłokowych
    Experimental research of oil grade and “cold start” conditions impact on intensity of piston’s rings wearing
    Autorzy:
    Lewkowicz, R.
    Piątkowski, P.
    Kiedrowski, T.
    Ściegienka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/315450.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    pierścienie tłokowe
    układ tłokowo-korbowy
    eksploatacja silnika
    piston rings
    piston-crank system
    engines exploitation
    Opis:
    W artykule przedstawiono wyniki badań eksperymentalnych wpływu rozruchu zimnego silnika na zużycie pierścieni tłokowych oraz tulei cylindrowej silnika spalinowego z zapłonem iskrowym. Celem badań było wykazanie wpływu częstości rozruchu i jakości oleju silnikowego na intensywność procesu zużycia tulei cylindrowej oraz pierścieni tłokowych. Badania obciążeniowe wykonano na specjalnie zaprojektowanym i wykonanym stanowisku badawczym z użyciem dwóch rodzajów olejów silnikowych wg klasyfikacji SAE oznaczonej jako 10W40, natomiast zużycie określono bezpośrednio poprzez pomiar wymiarów geometrycznych.
    Results of experimental research of piston rings and cylinder wearing process were presented in this article. The oil grade impact on piston’s rings wearing intensity were discussed in this paper. Research were conducted for “cold start” engine condition. The results were obtained for two different condition of 10W40 engine oil, like the new and used. Piston’s rings wearing process were assessed directly by measurement of geometrical parameters.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1127-1132
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-quality silumin on pistons of combustion engines
    Autorzy:
    Jankowski, A.
    Pietrowski, S.
    Sieminska, B.
    Szymczak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/245889.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    piston
    composite alloys
    heat treatment
    thermal expansion
    hysteresis
    Opis:
    In the paper the test results are presented for the AlSH2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 newly worked out silumin close to eutectic piston-silumin with the elevated content ofcopper and nickel to approx. 5% with relation to generally applied the AISH2 piston silumin. The novel silumin contains also Cr, Mo, In and V micro alloy additions in quantity approx. 0.05 percent for every element. Research of microstructure, HB hardness and coefficient of lineal thermal expansion a for the AlSil2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 silumin in the cast state, after the separation strengthening and additional short duration high-temperature heat-treatment were performed. Research of the microstructure of the AlSH2Cu5Ni5MgO.5CrO.05MoO.05WO.05VO.05 silumin showed the occurrence in it following constituent phases: alfa(Al), beta(Si), Al2Cu and AlMoCrWVMgNiSiCuFe. The separation strengthening brought about the coagulation of silicon emissions. The short duration high-temperature heat-treatment caused additional coagulation of silicon emissions and also its coalescence. Measurement of the HB hardness showed high hardness investigated alloy in the rough state, approx. 30% higher from the AlSi2 piston silumin. Measurement of the a coefficient of thermal expansion showed beneficial effects of novel alloy connected with the value decreasing of this coefficient as well so called hysteresis. Further studies on novel alloy will concentrate on alloy-additional and processes of the heat treatment.
    Źródło:
    Journal of KONES; 2009, 16, 4; 563-573
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some problems pistons made from composite materials with small hysteresis to combustion engines
    Autorzy:
    Jankowska-Sieminska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/245555.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    combustion engine piston
    composite alloys
    thermal expansion
    hysteresis
    Opis:
    Novel composite ma hysteresisterials on the pistons are characterised that they occur in them multiple intermetallic phases which crystallize in the high temperature, before crystallization of the alfa+beta (Al+Si) eutectic. For forming of pre-eutectic phases, chromium and molybdenum are introduced to silumins, and for derivation of multiple increased concentration of nickel and copper and decreased concentration of magnesium are accomplished. On the basis of evaluations of mechanical and thermal loads of combustion engines pistons applying essence of composite materials of combustion engines pistons, as well requirements for combustion engines pistons, especially high loaded engines are expressed. Test results of hardness, influence of temperature of casting, test results of mechanical properties, friction coefficient and coefficient of thermal expansion are presented in the paper. The special attention devoted to so called hysteresis coefficient of thermal expansion and hysteresis of the relative elongation in function temperature and time. Courses of coefficient of thermal expansion for standard and composite material are presented. Differences of the a coefficient during heating and cooling in function temperature are relative to kind of heat treatment. Two-stage heat treatment is beneficial for the obtainment small values of the a coefficient.
    Źródło:
    Journal of KONES; 2011, 18, 3; 123-128
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of engine load on piston ring pack operation of a marine two - stroke engine
    Autorzy:
    Wolff, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246695.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    marine engines
    piston rings
    gas dynamics
    hydrodynamic lubrication
    mixed friction
    Opis:
    A set of piston rings is used to form a dynamic gas seal between the piston and cylinder wall. Many physical phenomena are associated with the operation of the system piston-ring-cylinder (PRC), such as: inter-ring gas dynamics for the labyrinth seal, hydrodynamic lubrication and mixed friction in gaps between the rings and cylinder liner, oil flow and distribution of lubricant along the liner, twist motion of rings, liner temperature influence on the oil viscosity. A complex model of the PRC system has been developed by the author. Among own models it includes several sub-models taken from literature, like: a model of viscous oil flow between rough gap surfaces formulated by Patir and Cheng and an elastic contact model of Greenwood and Tripp. The main parts of the mathematical model and software have been experimentally verified abroad by the author at the marine engine-designing centre. A relatively good qualitative and quantitative compatibility between the experimental measurements and calculated results has been achieved. In contrast to the previous papers of the author, new calculation results for a marine two-stroke engine have been presented. These results concern influence of engine load on piston ring pack operation of the analysed engine. They include basic physical quantities associated with gas and oil flow in the piston-ring-cylinder system of the engine. The developed model can be utilized for: evaluation of gas leakage through the sealing ring set, prediction of lubrication conditions of piston rings and oil consumption, defining areas of the possible cylinder liner wear and profile changes of piston rings sliding surfaces, and thus can be useful for optimization of the PRC system design.
    Źródło:
    Journal of KONES; 2012, 19, 2; 557-568
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical analysis of failure of combustion engines elements
    Autorzy:
    Karczewski, M.
    Koliński, K.
    Walentynowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244604.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    3D scanning
    piston failure
    triangulation principle
    poligonization
    Opis:
    Methodology of analysis of damages of piston combustion engines by using 3D scanner enabling threedimensional analysis of such damages was introduced in the study. The principle of the device operation and his investigative possibilities were introduced. Presented is a phased process of scanning. The possibilities of the method were analyzed on examples of the damaged pistons for this engine supplied by fuel with low octane number. Precision of the damage measurements were estimated. The piston is one of the busiest part of the engine. The effects of wear on its surface are irregular and difficult to quantify. Geometric shape changes are related to: - movement of material in the case of dry friction due to accidents, - loss of material due to burnout, - formation of carbon deposits. With the 3D scanner is possible to observe these processes and to quantify the resulting deformation. The measurement results can be edited in many different ways to connect them to present them in an accessible form. Moreover, data obtained in digital form, you can quickly send long-distance transport instead of the actual object which is costly and time consuming.
    Źródło:
    Journal of KONES; 2011, 18, 1; 237-242
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The dynamic TDC assigning on the marine four stroke engines indication diagram
    Autorzy:
    Kowalak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/243233.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    marine diesel engines
    combustion processes
    power estimation
    determination of piston's TDC
    Opis:
    Determination of the internal combustion piston engine 's indicated power is a complex task. A number of difficulties lead to lots of solutions utilized to increase the accuracy of the result. This paper reports on the experiments concerned with a four stroke engine's piston dynamic position determination. Although the paper is mostly concerned with the piston's TDC definition, the experimental methodology can be utilized in the entire piston movement determination. A specially developed measuring assembly and its working principle utilized in the experiment have been presented too. It allows the acquiring of a set of time-position coordinates. Based on the coordinates, the mathematical algorithm for dynamic piston positioning can be developed. As the piston movement was being observed from the crankcase side, the methodology proved to be relatively cheap and easier for installation, compared to proximity sensors installed in the cylinder head. The advantage of optical sensors and light pipes being used was reduction of the explosion risk in oil mist environment inside the crank case.
    Źródło:
    Journal of KONES; 2007, 14, 2; 259-266
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction reducing performance of carbon nanotubes covered pistons in internal combustion engines – engine test results
    Autorzy:
    Kałużny, J.
    Merkisz, J.
    Kempa, K.
    Gapiński, B.
    Wróblewski, E.
    Stepanenko, A.
    Al-Karawi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/133001.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    combustion engines
    piston
    carbon nanotubes
    friction
    silniki spalinowe
    tłok
    nanorurki węglowe
    tarcie
    Opis:
    This article discusses the posibility of reducing friction losses in internal combustion engines by using carbon nanotubes, pointing out the large potential of this application. Experimental pistons were made of standard aluminum alloy and coated with a layer of nanotube deposits by spraying them with an aqueous solution containing the binder. The proposed technology of applying layers of nanotubes can be adopted in industrial-scale production. Engine tests were carried out showing a significant reduction of the engine motoring torque, up to 16% for the experimental pistons, thus confirming the favorable tribological properties of nanotubes observed in tribological research and reported by many authors. Supplementary tests were carried out: SEM, EDS, coordinate measuring technique, and x-ray tomography. An alternative technology for hierarchical nanotube multilayer coatings electro-deposition was proposed.
    Źródło:
    Combustion Engines; 2018, 57, 1; 14-24
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie skanera 3D do analizy uszkodzeń silników spalinowych
    Failure analysis of combustion engines elements with scanner 3D
    Autorzy:
    Karczewski, M.
    Koliński, K.
    Walentynowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/222206.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    silniki
    skanowanie 3D
    uszkodzenia tłoków
    combustion engines
    3D scanning
    piston failure
    Opis:
    W artykule przedstawiono metodykę analizy uszkodzeń tłokowych silników spalinowych za pomocą skanera 3D umożliwiającego trójwymiarową analizę obiektów przestrzennych. Przedstawiono zasadę działania urządzenia oraz jego możliwości badawcze. Przeanalizowano możliwości metody na przykładzie uszkodzeń eksploatacyjnych tłoków silnika o ZS zasilanego paliwem lekkim. Oceniono dokładność pomiarów uszkodzeń tłoków silnika.
    The paper presents a methodology used to analyze damage of piston combustion engines by means of 3D scanner enabling three-dimensional analysis. It shows the principle of the device operation and its investigative potentials. Damage done to pistons in operation of engines burning fuel with low octane number was used to analyze the potentials offered by the method. It assesses the accuracy damage to engine piston measurements.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2011, R. 52 nr 1 (184), 1 (184); 59-66
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel engine of higher efficiency
    Autorzy:
    Siemińska, B.
    Drew, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/242762.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    combustion engines
    constant volume combustion chamber
    dual heat path
    non moving piston
    Opis:
    The idea of the new engine results that is possible increasing of the work efficiency of the engine. novel engine of higher efficiency development and the novel method of cylinder filling, piston stop study, dual heat path, piston cooling, combustion chamber pressure development in the constant volume phase, stress containment in the non moving piston, emissions with the direct injection installation. The creature of the solution consists in the realization the process of the combustion at the constant of the volume combustion chambers. It is realized with a piston stand during the period of combustion process. This permits on maximum pressure increasing and average indicated pressure. The enlargement of the efficiency is obtained, and finally - decrease of fuel consumption. Whereas at such itself average indicated pressure, the maximum decrease appears. This development's intention is to answer the question of alternate method of production of mechanical power from the expanding medium. The novel engine of higher efficiency development and novel engine of higher efficiency patents address the means and methods of exchange of spent or burned gasses for the fresh charge of air or fuel-air mixture in the two stroke configuration using the circular cross section pistons like the conventional four and two stroke engines mentioned above and the practical method of stopping the piston mid cycle that will create a constant volume combustion chamber for the duration of the combustion process.
    Źródło:
    Journal of KONES; 2007, 14, 4; 409-416
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinematic of marine piston-crankshaft system
    Autorzy:
    Murawski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/246452.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    marine propulsion system
    piston-crankshaft kinematic
    slow speed engines
    inertia forces
    propulsion system vibrations
    Opis:
    Two-stroke, slow speed main engines are often installed on merchant ships, because of its very high efficiency. That kind of engine has an output of about 5500 kW per cylinder. The mass of piston-crankshaft system reaches over a dozen tons. That reciprocating masses are source of high level of dynamic inertia forces (mass forces). Those forces have big influence on engines working parameters and characteristics. One of them is instability of crankshaft rotational speed, which leads to dangerous torsional vibrations of propulsion system. Some inconsistency can be observed during analysis of piston-crankshaft system kinematic. In the theoretical engine books, the piston speed and acceleration has only two harmonic components, the inertia forces are depended on engine rotation speed and they doubled rotation speed. However, empirical formulas, published by engines producers, give us at least five harmonic components of mass forces. The author tries to find out the theoretical reason of existing (measured) higher harmonic orders of engines inertia forces. It is a first step for developing monitoring system of propulsion system’s torsional vibrations coupled with axial vibration, dynamic shaft line alignment and crankshaft springing. In the paper two analytical methods of piston displacement, speed and acceleration are presented. Well-known (from literature) equations are compared with more-detailed analytical procedures. The analysis was performed for one of the biggest marine MAN B&W engine, type 7K98MC. A discussion about the analysis results was included in the final part of the paper.
    Źródło:
    Journal of KONES; 2015, 22, 2; 155-162
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the combustion chamber strength of aluminum pistons in diesel engines using the DuralBowl technology
    Autorzy:
    Żurawski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/24202436.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engines
    DuralBowl
    piston
    combustion chamber
    chamber melting
    silnik Diesla
    tłok
    komora spalania
    topnienie komory
    Opis:
    The article focuses on the problem of loading the combustion chamber of diesel engine pistons together with the method of its optimization using the DuralBowl technology. Along with the growing requirements of exhaust emission standards, the increasing competition in the efficiency of internal combustion engines, the load on the combustion pistons increases due to the increase in pressure and temperature of fuel combustion and the tendency to slim the structure. Numerical analyzes and analyzes of damaged pistons in diesel engines have shown that one of the places most exposed to piston damage are the combustion chambers. There is a concentration of thermomechanical stress at the edge of the combustion chamber, which may lead to the destruction of the piston and the necessity to carry out overhaul of the drive unit. One of the technologies that optimizes the strength of this zone is the DuralBowl local remelting process. This process allows for several timesimprovement in the fatigue strength of pistons in internal combustion engines. The article analyzes the thermomechanical load on the combustion chamber along with the impact of this load on the durability of pistons in diesel engines. An analysis of the DuralBowl process was also performed, aimed at eliminating the negative effects of loading the combustion chamber, extending the piston life. The analysis focused on the microstructure of the material before and after the DuralBowl process.
    Źródło:
    Combustion Engines; 2023, 62, 1; 91--96
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanorurki węglowe jako substancja uszlachetniająca prowadząca do poprawy parametrów trybologicznych zespołu tłok-cylinder silnika spalinowego
    Carbon nanotubes as ennobling substance leading to the improvement of the tribological movements piston-cylinder of internal combustion engine
    Autorzy:
    Iskra, A.
    Babiak, M.
    Wróblewski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/317208.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    silniki spalinowe
    zespół tłok-cylinder
    trybologia
    nanorurki węglowe
    internal combustion engines
    piston-cylinder
    tribology
    carbon nanotubes
    Opis:
    Aktualne tendencje rozwoju silników spalinowych kładą szczególny nacisk na ciągłe zmniejszanie zużycia paliwa i emisji toksycznych składników spalin. Jednym ze sposobów spełnienia tych założeń jest redukcja tarcia w grupie tłok-cylinder. W artykule przedstawione zostały wyniki badań oporów ruchu tłoków pokrytych warstwą nanorurek węglowych oraz dodatku nanorurek węglowych do oleju silnikowego jako substancji uszlachetniającej. Pokrycie powierzchni nośnej tłoków nanorurkami węglowymi wykazały znaczną redukcję strat tarcia w grupie tłokowo-cylindrowej. Doprowadziło to także do redukcji zużycia paliwa. Również przez uszlachetnianie oleju smarującego, obszaru współpracy tłoka z gładzią cylindrową, poprzez tworzenie struktur nanorurek może prowadzić do dalszego obniżenia oporów tarcia.
    This article presents the results of motion resistance measurements of an engine equipped with pistons coated with carbon nanotubes and using carbon nanotube additions to the engine’s oil as the active additive. Covering the side surface of the piston with carbon nanotubes results in significant reduction in friction loss of the piston-cylinder system, and reduction in fuel consumption. Supplementing the lubricating oil working in the piston-cylinder liner area with nanotubes could also result in a further reduction of frictional resistance. Nanotubes in the lubricating oil can create structures able to significantly change oil properties, however, suspension creation processes are radically different.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 905-908
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine diesel engine pistons instantaneous position experimental determination
    Eksperymentalne wyznaczanie chwilowego położenia tłoka silnika okrętowego
    Autorzy:
    Kowalak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/258342.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    okrętowy silnik spalinowy
    szacowanie położenia
    tłok TDC
    marine diesel engine
    diesel engines indication
    piston TDC determination
    Opis:
    Przedstawiono eksperymentalne możliwości obserwacji ruchu tłoka poprzez skrzynię korbową silnika okrętowego. Wyznaczono charakterystyczne punkty położenia tłoka w czasie. opracowano metodę estymacji wystąpienia GMP tłoka na podstawie jego obserwowanych położeń. Zaproponowano model matematyczny umożliwiający szacowanie położenia dynamicznego GMP tłoka na podstawie obserwacji jego ruchu. Wykazano występowanie różnicy pomiędzy wystąpieniem GMP termodynamicznym, a GMP dynamicznym.
    The experimental possibility of piston movement observation through the crankcase has been presented. The characteristic piston positioning points in the time domain have been determined. The piston TDC estimation methodology based on observed positioning points has been developed. A mathematic model for piston TDC estimation has been proposed. The difference between thermodynamic and dynamic TDC has been detected and presented.
    Źródło:
    Problemy Eksploatacji; 2007, 3; 113-120
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic simulation comparison of opposed two-stroke and conventional four-stroke engines
    Autorzy:
    Shokrollahihassanbarough, F.
    Alqahtani, A.
    Wyszynski, M. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/133447.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    opposed piston two-stroke engine
    AVL Boost software
    thermodynamic benefits
    conventional crankshaft engines
    silnik dwusuwowy
    korzyści termodynamiczne
    Opis:
    Today’s technology leveraging allows OP2S (Opposed Piston 2-Stroke) engine to be considered as an alternative for the conventional four-stroke (4S) engines as mechanical drive in various applications, mainly in transportation. In general, OP2S engines are suited to compete with conventional 4-stroke engines where power-to-weight ratio, power-to-bulk volume ratio and fuel efficiency are requirements. This paper does present a brief advent, as well as the renaissance of OP2S engines and the novel technologies which have been used in the new approach. Also precise thermodynamic benefits have been considered, to demonstrate the fundamental efficiency advantage of OP2S engines. Hence, simulations of two different engine configurations have been taken into consideration: a one-cylinder opposed piston engine and two-cylinder conventional piston four-stroke engine. In pursuance of fulfilling this goal, the engines have been simulated in AVL Boost™ platform which is one of the most accurate Virtual Engine Tools, to predict engine performance such as combustion optimization, emission and fuel consumption. To minimize the potential differences of friction losses, the bore and stroke per cylinder are taken as constant. The closed-cycle performance of the engine configurations is compared using a custom analysis tool that allows the sources of thermal efficiency differences to be identified and quantified. As a result, brake thermal efficiency, power and torque of OP2S engine have been improved compared to conventional engines while emission concern has been alleviated.
    Źródło:
    Combustion Engines; 2015, 54, 3; 78-84
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of piston ring profiles and oil temperature distribution on cylinder liner lubrication of a marine two-stroke engine
    Autorzy:
    Wolff, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/132952.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine engines
    piston rings
    gasdynamics
    hydrodynamic lubrication
    mixed friction
    silniki okrętowe
    pierścienie tłokowe
    gazodynamika
    smarowanie hydrodynamiczne
    tarcie mieszane
    Opis:
    In the paper a comprehensive model of a piston-ring-cylinder (PRC) system has been presented. The local thickness of the oil film can be compared to height of the combined surface roughness of a cylinder liner and piston rings. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works of Patir, Cheng and Greenwood, Tripp have been applied. The main parts of the model have been experimentally verified abroad by the author at the marine engine designing centre. In contrast to the previous papers of the author concerning the PRC system of combustion engines, new calculation results for a marine two-stroke engine have been presented. Firstly the right selection of barrel-shaped sliding surface of piston rings has been analysed. Secondly the influence of oil temperature distribution along the cylinder liner on the lubrication of the PRC system has been assessed. The developed model and software can be useful for optimization of the PRC system design.
    Źródło:
    Combustion Engines; 2019, 58, 3; 257-263
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing of High-Cycle Fatigue Lifetimes in Un-corroded and Corroded Piston Aluminum Alloys in Diesel Engine Applications
    Autorzy:
    Azadi, M.
    Aroo, H.
    Parast, M. S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079778.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bending fatigue
    corrosion fatigue
    piston aluminum alloys
    diesel engines
    immersion time
    zginanie
    zmęczenie korozyjne
    tłoki
    stopy aluminium
    silnik Diesla
    Opis:
    Diesel engine components in the combustion chamber have been exposed to cyclic loadings under environmental effects, including high temperatures and corrosive fluids. Therefore, knowing the corrosion-fatigue behavior of materials is essential for designer engineers. In this article, pure fatigue and corrosion-fatigue behaviors of the piston aluminum alloy have been experimentally investigated. For such an objective, as-cast and pre-corrosive standard samples were tested by the rotary bending fatigue machine, under 4 stress levels. Some specimens were exposed to the corrosive fluid with 0.00235 % of the sulfuric acid for 100 and 200 hours. The results showed higher weight losses for 200 hours immersion times. As another result, it could be concluded that the lifetime decreased in pre-corrosive samples for both 100 and 200 hours of the immersion time, compared to that of as-cast specimens. However, such a lifetime reduction was more significant for 200 hours of the immersion time, especially within the high-cycle fatigue regime (or lower stress levels). Under high stress levels, both pre-corrosive sample types had almost similar behaviors. The field-emission scanning electron microscopy images of specimen fracture surfaces indicated that the brittle region of the fractured surface was larger for specimens after the 200 hours of corrosion-fatigue testing than the other specimen.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics of vessel power plants
    Diagnostyka okrętowych siłowni spalinowych
    Autorzy:
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/329162.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    diagnostyka techniczna
    tłokowy silnik spalinowy
    turbinowy silnik spalinowy
    siłownia okrętowa
    technical diagnostics
    piston engine
    gas turbine engines
    vessel power plants
    Opis:
    In this paper, the problems of diagnostics of main propulsion marine engines are presented. Piston or turbine engines are used for main propulsion of vessel power plants. Diesel engine diagnostic systems of merchant vessel engines are discussed. Finally, description of diagnostic methods implemented in turbine and piston engines in Polish Navy ships are introduced.
    W referacie przedstawiono problematykę diagnozowania okrętowych silników napędu głównego. Silnikami tymi mogą być tłokowe lub turbinowe silniki spalinowe. Omówiono stosowane systemy diagnostyczne silników statków handlowych. Przedstawiono także opis metod diagnostycznych w zbudowanych systemach diagnozowania silników tłokowych i turbinowych okrętów Polskiej Marynarki Wojennej.
    Źródło:
    Diagnostyka; 2008, 4(48); 133-137
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the oil supply through the connecting rod to the piston cooling channels in medium speed engines
    Autorzy:
    Jaskiernik, Maciej
    Buczek, Konrad
    Walkowiak, Jędrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2097450.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    oil flow simulation
    piston cooling
    connecting rod dynamics
    medium speed engines
    symulacja przepływu oleju
    chłodzenie tłoków
    dynamika korbowodu
    silnik średnioobrotowy
    Opis:
    The importance of the oil flow simulation in connecting rod oil channels during the engine development process is recently increasing. This can be observed either in medium speed engines, where, as one of the traditional solutions, the oil for piston cooling is supplied through the connecting rod, or in automotive engine VCR (variable compression ratio) connecting rods, where engine oil is used to change the compression ratio of the engine. In both cases, precise numerical results are necessary to shorten the prototyping period and to reduce the overall development cost. The multi-physics character of the simulation problem basically consists of the interaction between the dynamics of the crank train components and the oil flow. For the oil supply to the piston cooling channels through the connecting rod in medium speed engines, being the objective of this paper, a major influencing factor is the oil pressure behavior in the piston cooling gallery providing periodical interaction with its supply. At the same time, the connecting rod elastic deformation during engine operation can be regarded as negligible and the planar motion of the connecting rod can be reproduced by combination of translational and rotational acceleration fields in the CFD solver. The paper includes the description of the applied simulation approach, the results and a comparison with the state-of-the art calculation without consideration of the above-mentioned influencing factors.
    Źródło:
    Combustion Engines; 2020, 59, 1; 25--30
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of piston ring pack configuration on blowby and friction losses in a marine two-stroke engine
    Autorzy:
    Wolff, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/134100.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine engines
    piston rings
    gas dynamics
    hydrodynamic lubrication
    mixed friction
    silnik okrętowy
    pierścień tłokowy
    dynamika gazów
    smarowanie hydrodynamiczne
    tarcie mieszane
    Opis:
    In the paper a comprehensive model of a piston ring pack motion on an oil film has been presented. The local thickness of the oil film can be compared to height of the combined surface roughness of a cylinder liner and piston rings. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works of Patir, Cheng and Greenwood, Tripp have been combined and used in this paper. In addition a model of gas flow through the labyrinth seal of piston rings has been developed. The main parts of the model and software have been experimentally verified abroad by the author at the marine engine designing centre. For the selected two-stroke marine engine, the influence of the number of piston rings used and the type of the top ring lock (straight or overlapped) on blowby to piston underside and on friction losses of the piston-ring-cylinder (PRC) system have been investigated. The developed model and software can be useful for optimization of the PRC system design.
    Źródło:
    Combustion Engines; 2017, 56, 3; 164-170
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operational evaluation of piston-rings-cylinder liner assembly wear in high power marine diesel engines
    Eksploatacyjna ocena zużycia układu tribologicznego tłok–pierścień–cylinder okrętowych silników spalinowych dużych mocy
    Autorzy:
    Adamkiewicz, A.
    Drzewieniecki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/187972.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    tribological wear
    piston–piston rings–cylinder liner assembly
    high power diesel engines
    marine main propulsion
    top layer
    scavenge ports
    zużycie tribologiczne
    układ tłok-pierścienie tłokowe-tuleja cylindrowa
    silniki spalinowe dużych mocy
    napęd główny statku
    warstwa wierzchnia
    okna przepłukujące
    Opis:
    This paper presents an operational evaluation of piston-piston rings-cylinder liner (PRC) assembly wear in marine diesel engines of high power. It is based on visual inspection through cylinder liner scavenge ports. Clearance measurements of piston rings in piston grooves and piston ring gap measurements were used to evaluate the extent of wear of the PRC assembly. Moreover, it is shown that piston ring gap measurements can be used as a reference parameter in wear trend analysis to predict the length of time periods between overhauls (TBO). Furthermore, it has been shown that controlling the wear of chromium (protective) layers of piston ring working surfaces by measuring their thickness with induction and eddy current methods is highly useful. They were accepted as a source of information on PRC lubrication correctness and as a symptom of its technical condition. Factors indicating the necessity of an overhaul and introducing operational methods of improving working conditions between the tribological pair – liner and piston rings have been determined.
    W artykule przedstawiono metodę eksploatacyjnej oceny zużycia układu tribologicznego: tłok–pierścienie tłokowe–tuleja cylindrowa (TPC) okrętowego silnika spalinowego dużej mocy. Metoda oparta jest na wynikach inspekcji wizualnych z wykorzystaniem okien przepłukujących tulei cylindrowych. Do oceny stopnia zużycia układu TPC wykorzystano pomiary luzów między pierścieniami a rowkami tłoka oraz pomiary luzu w zamkach. Wykazano, że wyniki pomiarów luzów w zamkach pierścieni tłokowych mogą być miarami stopnia zużycia wykorzystywanymi jako parametry referencyjne w analizie trendu zużycia do prognozowania okresów pomiędzy przeglądami. Pokazano przydatność kontroli zużywania się warstw wierzchnich roboczych powierzchni pierścieni tłokowych (pokrytych powłokami ochronnymi) metodami indukcyjnymi. Otrzymane oceny zużycia tribologicznego weryfikowano na podstawie wyników analizy oleju cylindrowego pobieranego z komór podtłokowych silnika. Uznano je za źródło informacji o poprawności smarowania układu TPC oraz jako symptom stanu technicznego układu. Określono czynniki wyznaczające konieczność przeprowadzenia remontu oraz wprowadzenia eksploatacyjnych metod poprawy warunków współpracy układu tribologicznego tuleja cylindrowa–pierścienie tłokowe.
    Źródło:
    Tribologia; 2017, 271, 1; 5-15
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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