Temat: piston engines - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

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

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

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

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

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

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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

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