Temat: spark ignition - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of compression ratio on combustion, turbulence, swirls into model combustion chamber of SI engines
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/246616.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: internal combustion engines
spark ignition
combustion processes
new combustion systems
combustion process visualisation
Opis:: The results of the visualization researches, with the pressure measurement results are presented in the paper. Researches deal with the combustion system with semi-open combustion chamber for spark ignition engines. This system was elaborated in Aircraft Engine Department of Heat Engineering Institute of Warsaw University of Technology. During researches the influence of CR on a flame front propagation and turbulences into combustion chamber, when CR and ignition advance are varied, was determined. The model combustion chamber was made with the constant volumes ratio (the prechamber volume to the prechamber plus main combustion chamber volumes) of 28%. The CR were varied: 6:1, 8:1, 10:1 and 12:1, by changing of combustion chamber length and establish high. The researches were performed using rapid compression machine (RCM). The combustion sequences were recorded using high-speed digital camera with speed of 5000 frames per second. Simultaneously with combustion sequences recording, the high-speed pressure courses were registered. The research results show that the growth of compression ratio causes an improvement of combustion system performances; an increase of maximum cycle pressure and useful work field. The improvement of the performances is caused mainly by shortening of the combustion time and intensification of the turbulences and approaching of supposed combustion course.
Źródło:: Journal of KONES; 2015, 22, 4; 179-186
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research effects of novel combustion system with semi-open combustion chamber using rapid compression machine
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/245605.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: internal combustion engines
spark ignition
combustion processes
engine combustion systems
combustion process visualization
Opis:: The combustion system with semi open combustion chamber (SOCC) was originally elaborated in Aircraft Engine Department of Warsaw University of Technology. In this system the original combustion chamber of the standard SI engine, was divided by partition in prechamber and main combustion chamber, but yet this division exists only when the piston is close to TDC, on the contrary by the rest of the cycle the chambers are fully open. The system operation mechanism, the visualization research results, the high speed changed of the pressure measurements, was presented in this paper. The influence on the system performances of the different combustion systems parameters: the prechamber volume, the nozzle hole diameter in the partition, the ignition place, the compression ratio, and the ignition advance angle (IAA), on the basis of the research results, using rapid compression machine was presented in this paper. All research results show, that the best results of the system operation can be obtained if the stream outflow from prechamber to main combustion chamber starts when the piston is at TDC, and if the stream energy will be so big to displace all main combustion chamber before the clearance between partition and piston crown was opened. If the system operated correctly, the combustion time shortening, the growth of the maximum cycle pressure, and the combustion efficiency increase were obtained.
Źródło:: Journal of KONES; 2014, 21, 4; 297-310
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Flame front propagation in combustion system with semi - open combustion chamber with different compression ratio
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/242590.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: internal combustion engines
spark ignition
combustion processes
new combustion systems
combustion process visualisation
Opis:: Researches of the combustion system with semi-open combustion chamber for spark ignition engines. This system was elaborated in Aircraft Engine Department of Heat Engineering Institute of Warsaw University of Technology. The researches concern the determination of influence CR on a flame front propagation into combustion chamber when CR and ignition advance are varied. The model combustion chamber make up with the constant volumes ratio of the prechamber volume to the prechamber plus main combustion chamber volumes, of 28%, but the CR were varied: 6:1, 8:1, 10:1 and 12:1, by changing of combustion chamber length. The researches were performed using rapid compression machine (RCM). The combustion sequences were recorded using high-speed digital camera with speed of 5000 frames per second. Simultaneously with combustion sequences recording, the high-speed pressure measurements were performed. The results of the visualization researches, with the pressure measurement results are presented in the paper. The research results show that the growth of compression ratio caused an improvement of combustion system performances; an increase of maximum cycle pressure and useful work field. The improvement of the performances is caused mainly by shortening of the combustion chamber length and approaching of supposed combustion course.
Źródło:: Journal of KONES; 2013, 20, 4; 227-235
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Combustion process visualisation in rapid compression machine modelling combustion in spark ignition engines
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/245855.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: internal combustion engines
spark ignition engines
combustion process
combustion process control
visualization of combustion process
Opis:: Mixture preparation and combustion processes in internal combustion engines are very complex and very difficult to investigate. These processes run very quickly and their parameters are changed quickly and in wide ranges. Therefore, the interpretation of measurement results is very difficult and uncertain. The visualization methods applied in the combustion researches can help to interpret the results. For many years, the visualization methods have been developed at the Aircraft Engine Department of Heat Engineering Institute of Warsaw University of Technology, in the field of combustion in engines, detonation and gas dynamics research. In these researches, different method of registration of very fast changes of combustion were applied. The combustion experiments have been performed in constant volume bomb, rapid compression machines and experimental visualisation engines. In the last case, the electronic digital camera of Photram SA 1.3 has been used. This paper refers to the experiments, which were conducted using rapid compression machine. Their goal was explanation the combustion mechanism in combustion system with semi-open combustion chamber under different parameters of this system. The obtained results show a strong influence of combustion system parameters on combustion mechanism, especially on a compression ratio and ignition timing. The strong swirls were registered at all sharp edges on combustion chamber during compression stroke. These swirls had a strong influence on the combustion system operation.
Źródło:: Journal of KONES; 2013, 20, 4; 219-226
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Control strategy combustion of system with semi – open combustion chamber of spark ignition engines
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/241853.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
spark ignition engines
combustion processes
new combustion system
new strategy of combustion control
Opis:: The attempts to increase the engine combustion efficiency of the spark ignition (SI) engines have led to development of the new combustion system with semi-open combustion chamber. This system is similar to flame jet ignition systems, which were applied in many production internal combustion engines. The similar pulsed jet combustion system was elaborated by Professor A. K. Oppenheim. In the system developed at Aircraft Engine Department of Warsaw University of Technology (AED) the standard combustion chamber of SI engine was divided on prechamber and main combustion chamber using partition. The ignition in prechamber is more reliable and repeatable but total burning time in the prechamber and main combustion chamber is shorter than in standard combustion chamber. The principal problem of efficient operation of this system and obtaining of the required performance is securing the relevant control strategy. The performances of this system are dependent from: the rate of this prechamber volume to total combustion chamber volume, the orifice diameter in a partition, the ignition place and the ignition advance angle (ignition timing). Among these parameters the ignition timing only may be varied in the continuous manner during the engine operations without of the engine disassembling. Therefore constant values separate parameters (prechamber volume, orifice diameter, ignition place) should be selected in comprehensive, time consuming researches for different engine operation conditions (engine speed, load and environment conditions) and subsequently the map of ignition advance angles should be determined at state remaining separate parameters. The values of the ignition advance angle should be selected and programmed in electronic control unit, which will be control the ignition advance angle at different engine operating conditions. The dependences between engine operating parameters and the ignition timing are not linear and therefore mechanical control system is not effective. Some research results concerning the best engine operating parameters has been presented in this paper.
Źródło:: Journal of KONES; 2012, 19, 4; 367-377
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigation of new combustion system with prechamber for spark ignition engines
Badania nowego systemu spalania dla silników o zapłonie iskrowym z półotwartą komorą spalania
Autorzy:: Leżański, T.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/246440.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silniki spalinowe
silniki o zapłonie iskrowym
spalanie
komory spalania
komory wstępne
kąt wyprzedzenia zapłonu
wizualizacja procesu spalania
internal combustion engines
spark ignition engines
combustion
combustion chamber
prechamber
ignition timing
visualization of combustion process
Opis:: In the study the high speed Schlieren photographs of combustion process and suitable pressure traces in cylinder, in experimental four cylinder four stroke internal combustion engine with the new combustion system, are presented. The new combustion system for spark ignition is the original system in which combustion chamber is divided into the prechamber and main chamber. The research engine was modified to operate with one cylinder only, but the other three cylinders operated without combustion. The cylinder head of this engine was equipped with specially designed lateral valve timing system. The research cylinder was equipped with quartz windows, mirrors and lenses system to provide optical access into the combustion chamber, in parallel direction to the cylinder axis. The crankshaft of research engine was driven with electric motor by the belt gear, with constant speed of 750 rpm. Research conditions: volume of prechamber - 27% of total volume combustion chamber and orifice diameter in partition - 3mm were established in research using rapid compression machine. The ignition advance angle in range of 0°CAD (TDC) to 30°CAD BTDC was changed. For these conditions the maximum values of pressure in combustion chamber and the best of combustion efficiency were obtained. The research clearly demonstrates that ignition timing play a main role in combustion intensification, because energy of burning mixture spray, which flows out from orifice in partition, depends on the ignition advance angle. In this research the best ignition timing, for test conditions, was determined.
W artykule zaprezentowano fotografie Schlieren procesu spalania oraz wyniki pomiarów ciśnienia w cylindrze w eksperymentalnym czterocylindrowym czterosuwowym silniku z nowym systemem spalania. Nowy system spalania silnika z zapłonem iskrowym jest oryginalnym systemem, w którym komora spalania jest podzielona na komorę wstępną i główną. Silnik badawczy został zmodyfikowany w taki sposób, żeby pracował na jednym cylindrze, a pozostałe trzy cylindry pracowały bez zapłonu. W cylindrze badawczym umieszczono system wzierników i luster pozwalających na przekazywanie obrazu spalania do szybkiej kamery fotograficznej. Silnik badawczy był napędzany silnikiem elektrycznym z prędkością obrotową 750 obr/min. Warunki badań: objętość komory wstępnej 27%, średnica otworu w przegrodzie - 3mm.W badaniach zmieniano kąt wyprzedzenia zapłonu w granicach 0° OWK - 30° owkprzed GMP. Stwierdzono istnienie optymalnej wartości kąta wyprzedzenia zapłonu dla tych warunków badań. W pracy przedstawiono: stanowisko badawcze oraz wybrane przebiegi procesu spalania. Stwierdzono istotny wpływ wstępnej komory spalania na intensyfikację procesu spalania w silniku.
Źródło:: Journal of KONES; 2007, 14, 3; 347-354
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Combustion process control in system with semi-open combustion chamber for spark ignition engines
Kontrola procesu spalania w systemie półotwartej komory spalania dla silników z zapłonem iskrowym
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/133345.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: internal combustion engines
spark ignition engines
combustion process
combustion process control
visualization of combustion process
silniki spalinowe
silniki o zapłonie iskrowym
proces spalania
kontrola procesu spalania
wizualizacja procesu spalania
Opis:: A few operation examples of combustion system with semi open combustion chamber for spark ignitron engines has been presented in this paper. This system has been designed in Aircraft Engine Department of Heat Engineering Institute of Warsaw University of Technology. The principal problem of operation this system is to assure that jet-stream commences to outflow from prechamber to main combustion chamber when the piston is at TDC and that it will have a sufficient energy quickly to displace all main chamber. This is a task for combustion control system. This can be obtained by correct selection of the system operating parameters: the volume ratio of prechamber to total combustion chamber, the hole diameter in partition, the igniter locations, the ignition advance angle. If this system has operate correctly it was obtained the shortening of combustion time about 2.2 time, growth of maximum cycle pressure 1.9 time and increase of combustion efficiency 1.4 time, in comparison to standard combustion chamber. This research results concern the test conducted using rapid compression machine.
W artykule przedstawiono kilka przykładów pracy systemu z półotwartą komora spalania przeznaczonego dla silników o zapłonie iskrowym. System ten został opracowany w Zakładzie Silników Lotniczych Instytutu Techniki Cieplnej Politechniki Warszawskiej. Podstawowym problemem pracy tego systemu jest zapewnienie, że początek wypływu strumienia z komory wstępnej do zasadniczej nastąpi wówczas, kiedy tłok znajduje się w GMP i że energia strugi będzie wystarczająca, aby szybko przebyć całą komorę zasadniczą. Takie jest zadanie układu sterowania. Może to być osiągnięte przez właściwy dobór parametrów pracy systemu: proporcji objętości komory wstępnej do całej objętości komory spalania, średnicy otworu w przegrodzie, miejsca zapłonu oraz kąta wyprzedzenia zapłonu. Jeśli ten system działał prawidłowo, to uzyskiwano: skrócenie czasu spalania około 2.2 razy, zwiększenie ciśnienia maksymalnego cyklu 1,9 razy i wzrost sprawności spalania 1,4 razy, w porównaniu ze standardową komorą spalania. Wyniki te dotyczą badań, które były prowadzone z zastosowaniem maszyny pojedynczego sprężu.
Źródło:: Combustion Engines; 2013, 52, 3; 434-441
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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