Temat: thermal combustion - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis and research of piston working conditions of combustion engine in high thermal load conditions
Autorzy:: Jankowska-Sieminska, B.
Jankowski, A.
Slezak, M.
Powiązania:: https://bibliotekanauki.pl/articles/243400.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
piston
thermal load
thermal expansion
thermal shock
Opis:: Explanation of phenomena occurring in pistons of combustion engines which appear during heating and cooling processes in reference to standard materials and composite materials of high material proprieties is aim of the paper. Bring over researches were mostly directed on measurements of difference dimensions which appear during the piston work in the combustion engine. The paper concentrates on phenomenon of different proprieties of materials. The thermal stresses and shocks differ. In the thermal shock, thermal stresses are caused by instantaneous temperature gradients which appear at high engine speed. These stresses are determined thro temperature distribution and they do not differ from stresses in steady-state conditions. Researches concerning thermal expansions were performed by means of sensitive dilatometer which can work in simple and differential system. Changes of dimensions versus temperature function were measured with inductive sensor and the sensitive Pt-ptrh thermocouple, and results were referred to reference material-Platinum. Research results are illustrated on diagrams of different courses of changes of the of thermal expansion coefficient during heating and cooling of standard and composite materials. Values of the thermal expansion coefficient a for the heating and cooling are smaller for composite alloys. The course of the coefficient â during cooling can be higher or lower from the coefficient a during heating. Similar values were also received. Maximum differences were of 10%. Smaller values of the coefficient a for composite alloys cause that for such the same thermal loads temperature gradients will be smaller for composite alloys. Courses of changes of the coefficient â have a different characteristics suited from chemical composition of alloy, granularity of the composite component and thermal treatment.
Źródło:: Journal of KONES; 2007, 14, 3; 233-243
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Testing of internal combustion engines of motorcycles with the use of thermal imaging methods
Autorzy:: Magdziak-Tokłowicz, M.
Skrętowicz, M.
Wróbel, R.
Sroka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/949484.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
thermal analysis
thermography
thermal research of motorcycles
Opis:: The internal combustion engine should be rated for the thermal loads that come from different sources. Thermal analysis is important both for design purposes and for evaluating the conditions of its use. Very good results are obtained by a combination of non-invasive measurement techniques, such as research using infrared thermal imaging techniques [3, 11]. The purpose of the study was to determine the engine thermal load by evaluating the average temperature on the outside surface of the engine at many of its points for two selected motorcycle engines with similar displacement capacities. For many reasons, such as ecology, durability, engine strength and thermal performance when heating and cooling are critical. To accomplish this task, a thermographic technique for indirect evaluation has been used, thus creating the possibility of measuring the temperature in a dynamic manner. These are accurate measurements and most importantly do not interfere with the construction of the object under investigation. The engine was tested during operation according to external and load characteristics. As a result of the work, graphs of temperature curves of heating and cooling of the tested engines were compiled. The article presents a methodology for measuring the temperature fields of outer surface engines. The collected material will be used in the future for studying the equable load on the cylinders, and as accurately as possible determine the conditions of movement such as power, revolutions, flow rates, temperatures and pressures.
Źródło:: Journal of KONES; 2017, 24, 4; 181-186
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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: 4.

Tytuł:: Coefficient of thermal expansion as a component quality estimation of alloys on pistons of combustion engines
Autorzy:: Sieminska, B.
Powiązania:: https://bibliotekanauki.pl/articles/245892.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
thermal expansion
coefficient of thermal expansion
Opis:: The aim of realized works in the area of materials on pistons is: low thermal expansion, small differences of coefficient of thermal expansion between heating and cooling, high stiffness at elevated temperatures, high hardness and wear resistance. Changes in thermal expansion coefficient during heating and cooling may be very large, as well as during subsequent cycles of heating and cooling of an internal combustion engine pis ton with respect to standard silumin alloys usedfor pistons of internal combustion engines. The paper presents: coefficient of linear expansion a for the AlSi standard alloy, coefficient of linear expansion a for the AlSi alloy with the apositive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the a negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive and negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive, negative and positive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the very small a differences between cooling and heating, coefficient relative elongation as afunction of temperature with the positive elongation differences between cooling and heating, coefficient relative elongation with the very small elongation differences between cooling and heating, coefficient the course of derivative as a function of temperature (T) during heating and cooling with the positive elongation differences.
Źródło:: Journal of KONES; 2009, 16, 4; 575-583
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Proposal of a piston engine with close thermal cycle of working medium
Autorzy:: Mitianiec, W.
Powiązania:: https://bibliotekanauki.pl/articles/242513.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
combustion engine
thermal cycles
closed system
Opis:: Ecological aspects and utilization of biomass as a fuel leads to applying of a closed work cycle in the piston engine. It forces usually to delivering of heat to working medium through a heat exchanger. The heat may get from any type of fuel in an external combustion chamber, which allows on precisely control of combustion process. The paper describes a new conception of the engine operating in two-stroke cycle with working medium being in the close system, the best with the perfect gas as argon or helium. The delivering process of working medium with high temperature from the heat exchanger takes place through the inlet valve during a few dozen degrees of CA rotation in piston position at TDC. Expansion stroke takes place until outlet valve opens shortly BBDC. The outlet period from the cylinder follows almost at constant pressure and at low temperature to an adiabatic chamber, from where the working medium is compressed by an adiabatic compressor to pressure near pressure being in the heat exchanger. The engine works in two-stroke cycle and enables to get low temperature and pressure as early as BDC through a long time of opening of the outlet valve. The paper presents the ideological scheme of the engine system and theoretical thermal cycle. On this basis one presents the theoretical description of the individual thermodynamic processes with determination of thermal parameters of the characteristic points of the cycle. This article determines also the thermal efficiency of such closed cycle. The presented engine may have a practical applying as a stationary engine in energetic systems, where as fuel may be biomass, which globally influences on decreasing of CO2 and NOx by temperature control of the combustion process
Źródło:: Journal of KONES; 2013, 20, 1; 209-217
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Preliminary research no vel composite materials with small hysteresis and high functional parameters for combustion engines pistons
Autorzy:: Siemińska-Jankowska, B.
Powiązania:: https://bibliotekanauki.pl/articles/246073.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
thermal expansion
hysteresis
Opis:: Pistons of internal-combustion engines are the most loaded elements of internal-combustion engines, belong to these specialistic elements, which have essential influence on the ecological properties of engines, their durability and reliability. The object of paper is pistons manufactured from the standard material and from new research alloy. The investigations were performed with dilatometer permitting on the registration of changes of the dimensions of sample in the function of temperature and time. The measurements are possible in straight system and in differential system. Exemplary results of investigations are presented in the paper. During the piston heating, period preutectic phases succumb the partial dissolution in solid solution a, but in the cooling process they secrete again. As a consequence the piston partial deformation occurs, which by result is gradual growth of difference between its expansibility during the warming and contraction in the process of cooling (so-called hysteresis occurs). The characteristics of the new piston silumin alloys give possibility of dearances minimalization and the obtainments of a correct engine performance in the full range of engine rotational velocities and loads. The effect are the decrease of the oil expenditure, the decrease of the emission of hydrocarbons in exhaust gases, the decrease of blowbys to crankcase, the decrease of the expenditure of piston rings grooves wear and the piston skirt wear, the decrease of the piston deformation and the increase of engine durability and reliability.
Źródło:: Journal of KONES; 2009, 16, 1; 447-452
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Composite alloy for IC engine pistons
Autorzy:: Jankowska-Sieminska, B.
Jankowski, A.
Sławinski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/246922.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
composite alloys
thermal analysis
Opis:: Aluminum is the most popular matrix for the metal matrix composites The Al alloys are attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and electrical conductivity, and their high damping capacity. The characteristics of metal matrix composite materials are determined by their microstructure and internal interfaces, which are affected by their production and thermal mechanical treatment. Investigations to improve the combustion piston engines arę leading to improve the working process performance by increase ofits parameters, especially the average temperature of the thermodynamic cycle. New piston consists of two parts manufactured of standard and composite materials are presented in the paper. Composite alloy has chemical composition of short fibre with Al2 O3 was following, in the mass percentage: 96% Al2 03, 4%, SiO2. As the binder the colloidal silica was used in quantity 5%. The volume of fibres in the insert was 22 plus or minus 2% by volume. Bending strength of the insert was 0.5 MPa. Temperature and stresses distribution in standard piston and different versions of composite pistons are introduced in the paper. The paper presents the resistance of investigated materials on thermal shocks. Experimental veriflcation of manufactured composite pistons in the engine proved the larger exhaust temperaturę for about 20-70°C, in comparison with the engine with standard pistons (that gives the greater effectiveness of turbo charging application), proved the lowering of a individual volume of gases blow-bys to the crankcase, the lowering of noise level, larger resistance on thermal loads.
Źródło:: Journal of KONES; 2010, 17, 2; 159-166
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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: 9.

Tytuł:: Thermal deformations of the SW680 engine piston depending on the applied combustion chamber shape
Odkształcenia cieplne tłoka silnika sw680 w zależności od kształtu zastosowanej komory spalania
Autorzy:: Mitukiewicz, G.
Sygniewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/243030.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silnik spalinowy
tłok
odkształcenia termiczne
komora spalania
combustion engine
piston
thermal deformations
combustion chamber
Opis:: The paper describes simulation model of thermal deformations of piston of Diesel engine with combustion chamber placed in piston crown. Results for different shapes of combustion chamber are presented and analyzed. For calculations assumed that thermal deformation of piston do not vary within engine 's cycle if it works in constant conditions. An hand of pressure and temperature charts of SW680 engine, heat transfer coefficient on piston crown surface was defined. Heat transfer coefficient on the rest piston surfaces was defined based on the literature. Using finite element method (FEM) code, piston shape was created, and then the piston body was meshed and loaded according to Fourier conditions. Nodes displacements let describe piston deformation. The simulation results allow to find the optimal shape of combustion chamber, in respect of piston deformation, and also can be the base to create the method of fast verify combustion chamber shape. Results simulation research of piston deformations showed that piston deformations were considerably dependent from combustion chamber shape . The biggest deformations came out for the chamber of small depth and the high diameter. Differences of thermal deformations of piston skirt reach to 50 mi m
W artykule przedstawiono model obliczeniowy odkształceń cieplnych tłoka silnika o zapłonie samoczynnym z komorą spalania umieszczoną w jego denku, oraz wyniki obliczeń dla różnych kształtów komory spalania wraz z ich analizą. Do obliczeń przyjęto, że odkształcenia cieplne tłoka są stałe w całym cyklu pracy silnika jeżeli pracuje on w ustalonych warunkach. Na podstawie wykresu indykatorowego silnika SW680 określono współczynnik przejmowania ciepła na powierzchni denka tłoka ALFA 0. Współczynniki przejmowania ciepła na pozostałych powierzchniach tłoka zostały przyjęte na podstawie zależności podanych w literaturze. Za pomocą programu komputerowego wykorzystującego metodę elementów skończonych (MES) zamodelowano tłok, a następnie dyskretyzowano jego objętość elementami przestrzennymi obciążonymi cieplnie przy wykorzystaniu warunków brzegowych trzeciego rodzaju (Fouriera). Wyznaczenie przesunięcia węzłów siatki pozwoliło na określenie odkształceń tłoka. Uzyskane wyniki obliczeń mogą stanowić punkt wyjścia do wyznaczenia optymalnego pod względem odkształceń cieplnych kształtu komory spalania a także być podstawą do stworzenia metody umożliwiającej szybką weryfikację przyjętego kształtu komory spalania. Wyniki badań symulacyjnych odkształceń tłoka, wskazały, że odkształcenia tłoka są w znacznym stopniu zależne od kształtu komory spalania. Największe odkształcenia wystąpiły dla komory o małej głębokości i dużej średnicy. Różnice odkształceń cieplnych części prowadzącej tłoka sięgają do 50mi m.
Źródło:: Journal of KONES; 2007, 14, 2; 327-334
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Experimental investigations of various modes of charging on HCCI engine
Autorzy:: Prasad, A. Renuka
Bhandari, Rakesh
Jagadish, Donepudi
Powiązania:: https://bibliotekanauki.pl/articles/245191.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: HCCI technology
homogeneous mixture
thermal efficiency
combustion rate
emissions
Opis:: Homogeneous Charged Compression Ignition technology is most favourable or suitable for Internal Combustion engines for reducing the exhaust emissions and enhances the Thermal efficiency, improve the fuel consumption, and increase the rate of combustion. This article represents the various charging methods on HCCI technology engine; it improves the engine performance and determines the emission characteristics of HCCI technology engine. The homogeneous mixture prepared with different methods. In –cylinder internal homogeneous mixture preparation method applied in this present work. It reduces the exhaust emissions released from the combustion chamber. However, oxides of nitrogen and soot emissions are significantly reduce, because combustion starts at lower temperatures and various points in combustion chamber. The HCCI technology generates small amount of exhaust emissions and it improves the performance of the engine. In addition, performance and released emissions depends on the quality and quantity of homogeneous mixture.
Źródło:: Journal of KONES; 2019, 26, 1; 119-126
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Determination of thermal efficiency of the spark ignition systems
Autorzy:: Sendyka, B.
Mitianiec, W.
Noga, M.
Wachulec, W.
Powiązania:: https://bibliotekanauki.pl/articles/246099.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion process
ignition system
thermal efficiency
spark plug
CNG
Opis:: The paper presents results of measurements performed to determine thermal efficiency of spark ignition systems. Because of small pressure change after sparking process smali volume chamber has been proposed for measurements. A direct measurement method of pressure increment determination has been chosen. In this method one pressure chamber is used. The caloric chamber isfilledwith nitrogen, which is a neutral gas. It is preferable medium than air because it is one-component gas and it has a precisely-known value of a specific gas constant. The value of speciflc gas constant is reąuested to calculate a value of discharge energy given to the gas. In the chosen method pressure increment in the chamber during spark discharge is measured. The pressure increment in the chamber during ignition is strictly related to the energy of spark discharge. The energy balance calculations determined values of heat los s es for two types of electrodes (normal and "thin") anddifferent initial pressure (p=0 bar and p=25 bar). The maximal value of the thermal efficiency was observedfor the higher value of pressure in chamber and thin electrodes of spark ping. It was also stated, that the higher thermal efficiency for" thin " spark ping electrodes is a result of reduced heat transfer. The paper presents results of the tests carried out in the caloric chamber of 4. l cm3 filled with nitrogen at ambient temperature using PCB transducer direct measurement method. Results of the measurements done using differential pressure transducer for the same parameters like in thefirst measurement method were similar.
Źródło:: Journal of KONES; 2010, 17, 1; 365-371
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Possibility to reduce knock combustion by EGR in the SI test engine
Autorzy:: Tutak, W.
Powiązania:: https://bibliotekanauki.pl/articles/246177.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion
knock
exhaust gas recirculation (EGR)
modelling
thermal cycle
Opis:: The paper presents the results of modelling thermal cycle of internal combustion engine including exhaust gas recirculation. The test engine can not achieve the optimum parameters of work due to occurrence of the knock combustion. The influence of EGR on the limits of the knock occurrence in the engine was studied. It turned out that few percent of exhaust gases in the fresh charge effectively shifts the knock limit to higher ignition advance angles. The values of the limit ignition timing for the test engine was determined in order to avoid combustion knock. Larger share of EGR caused too much slowing the spread of the flame inside the combustion chamber of the test engine. EGR at constant angle of ignition was very effective in limiting the content of NO in the exhaust, but on the other hand it has an adverse effect on the engine parameters. The engine operate with exhaust gas recirculation in order to obtain the possible best parameters the ignition timing should be optimized. However, that with increasing values of the thermodynamic parameters of thermal cycle of engine increased NO content in the exhaust. The paper presents results of modelling thermal cycle of IC engine, including exhaust gas recirculation and knock combustion. The object of researches was the S320ER spark ignition internal combustion engine supplied with petrol. The engine was operated at a constant speed of1000 rpm. Modelling of the thermal cycle of the test SI engine in the FIRE software was carried out.
Źródło:: Journal of KONES; 2011, 18, 3; 485-492
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Researches novel materials on the pistons with low hysteresis to combustion engines
Autorzy:: Sieminska, B.
Slawinski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243012.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
engine pistons
composite alloy
thermal expansion
hysteresis
Opis:: The researches were carried out at the use of the precise dilatometer of the firm BAHR 802/801. The device makes possible the registration of changes of measurements of the sample in the function of the temperature. Measurements in the simpler and differential are possible. Heating and cooling is performed in the special device, which realizes the programme temperature, controlled computer. Changes of dimensions are measured with an inductive sensor. Samples were placed in the quartz-pipe and changes of their length were transferred by quartz-rods. The temperature of tested material was measured by means of the Pt-PtRh thermocouple. Material on the pistons has a fundamental meaning for the value of the clearances between the cylinder and the piston. Too small clearness between the piston and cylinder on the cold engine cannot be applying, because during the work of an engine it would be able to occur seizing of an engine. From here, also the large resistance on seizing of material of the piston is essential. Investigated composite materials performed based on piston-silumins AK12 and AK18 in which a composite addition was silicon carbide (SiC) and ferric sulphide (FeS).
Źródło:: Journal of KONES; 2012, 19, 4; 549-554
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Thermal deformation of the SW680 engine piston depending on the position of combustion chamber
Odkształcenia cieplne tłoka silnika SW680 w zależności od położenia zastosowanej komory spalania
Autorzy:: Mitukiewicz, G.
Pawelski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/244887.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
silniki spalinowe
tłoki
komory spalania
odkształcenia cieplne
combustion engine
pistons
combustion chamber
thermal deformation
Opis:: The paper describes simulation model of thermal deformations of piston of Diesel engine with combustion chamber placed in piston crown. Results for different position of combustion chamber are presented and analyzed. For calculations assumed, that thermal deformation of piston does not vary within engine's cycle if it works in constant conditions. An hand of pressure and temperature charts of SW680 engine, heat transfer coefficient on piston crown surface was defined. Heat transfer coefficient on the rest piston surfaces was defined based on the literature. Using finite element method (FEM) code, piston shape was created, and then the piston body was meshed and loaded according to Fourier conditions. Nodes displacements let describe piston deformation. The results of initial simulation research of piston deformations shows that these deformations to a considerable degree will depend from the position of the combustion chamber. The largest deformations stepped out for piston with the chamber farther displaced from the piston axis, the smallest for piston with the symmetrically situated combustion chamber. The largest differences in the deformations steps out in the areas of piston crown. Results from the performed earlier simulations show, that the position of combustion chamber has comparable influence on the deformation of piston leading parts (so essential for the engine exploitation with accordance to the rules), how the combustion chamber shape. Obtained results encourage to the performing of further research works.
W artykule przedstawiono model obliczeniowy odkształceń cieplnych tłoka silnika o zapłonie samoczynnym z komorą spalania umieszczoną w jego denku, oraz wyniki obliczeń dla różnie położonych komór spalania wraz z ich analizą. Do obliczeń przyjęto, że odkształcenia cieplne tłoka są stałe w całym cyklu pracy silnika, jeżeli pracuje on w ustalonych warunkach. Na podstawie wykresu indykatorowego silnika SW680 określono współczynnik przejmowania ciepła na powierzchni denka tłoka a0. Współczynniki przejmowania ciepła na pozostałych powierzchniach tłoka zostały przyjęte na podstawie zależności podanych w literaturze[6]. Przy pomocy programu komputerowego wykorzystującego metodę elementów skończonych (MES) zamodelowano tłok, a następnie dyskretyzowano jego objętość elementami przestrzennymi obciążonymi cieplnie przy wykorzystaniu warunków brzegowych trzeciego rodzaju (Fouriera). Wyznaczenie przesunięcia węzłów siatki pozwoliło na określenie odkształceń tłoka. Wyniki wstępnych badań symulacyjnych odkształceń tłoka wskazują, że odkształcenia te w znacznym stopniu zależą od położenia komory spalania. Największe odkształcenia wystąpiły dla tłoka z komorą najdalej odsuniętą od osi tłoka, a najmniejsze dla tłoka z symetrycznie umieszczoną komorą spalania. Największe różnice w odkształceniach występują w okolicach korony tłoka. Z przeprowadzonych wcześniej symulacji wynika, że położenie komory spalania ma porównywalny wpływ na odkształcenie części prowadzącej tłoka (tak istotne dla prawidłowej eksploatacji silnika), jak kształt komory spalania. Otrzymane wyniki zachęcają do prowadzenia dalszych prac badawczych.
Źródło:: Journal of KONES; 2008, 15, 4; 359-367
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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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

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