Wszystkie pola: compression ignition engines - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Design of the rapid compression machines for combustion researches in spark ignition engines
Autorzy:: Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/241847.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: SI engines
rapid compression machine
combustion chamber
Opis:: The rapid compression machines (RCM) are extensive applied to combustion process researches and mixture process preparation research in the internal combustion engines (ICE). The principal advantage of these arrangements is easy optical access to the inside space of combustion chamber. This enables to observe the course of ignition process and the flame propagation process. There are some RCM designs, which they differ, first of all, the modelling method of piston movement into cylinder. The most known designs use the pneumatic and hydraulic drives. Their concern is that they enable the modelling compression stroke only but combustion is performed in constant volume combustion chamber. It was not relevant for the research of the new combustion system elaborated at Aircraft Engine Department of Warsaw University of Technology (AED). The RCM elaborated at AED has unique form it includes the crank mechanism, speedy operating electromagnetic clutch and flywheel. The applying of this design enables modelling the compression stroke and working stroke (two-stroke from engine cycle). It enables assessment of the system with semi-open combustion chamber what it will be impossible using other RCM designs. The different designs RCM used for combustion research at the research and development centres, on worldwide will be compared with the design of RCM developed at AED. The most known designs of the different RCM were described and the research result examples were given in this paper. The advantages and disadvantages of the different designs were discussed too in this paper.
Źródło:: Journal of KONES; 2012, 19, 4; 379-391
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

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: 4.

Tytuł:: Using of high speed photography to research of ignition process in SI engines with semi open combustion chamber
Zastosowanie fotografii szybkiej w badaniach procesu zapłonu w silnikach o zapłonie iskrowym z półotwartą komorą spalania
Autorzy:: Leżanski, T.
Sęczyk, J.
Siwiec, S.
Wolański, P.
Powiązania:: https://bibliotekanauki.pl/articles/245692.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silniki spalinowe
maszyna pojedynczego sprężu
spalanie
zapłon
wizualizacja procesów spalania
SI engines
rapid compression machine
combustion
ignition
combustion process
visualization
Opis:: The results of the research into visualisation of the ignition process in a combustion system with divided, semi open combustion chamber, for SI engines are presented in this paper. In this combustion system the original combustion chamber was divided, by partition, into prechamber and the main combustion chamber. Initiation of the ignition had place in the prechamber using electric spark plug. Expected results of the research of this combustion system were: shortening ofcombustion time in all combustion chambers, reduction of exhaust emission and increased engine efficiency. The research was focused on experimental study of flame propagation during ignition and combustion into the prechamber when the point of ignition was placed in the wali of the prechamber opposite to the ońfice in the prechamber, in the middle of the prechamber and in the orifice in the partition. The rapid compression machine (RCM) was used in the experimental research to facilitate visualisation of the process. This high speed Schlieren photography system and high speed pressure measurement system were used to record path of combustion and pressure variation in the combustion chamber. The best results were obtained when the point of ignition was placed at the wali of the prechamber, it was probably caused by flame front turbulisation immediately after ignition initiation. In this case the shortest time of combustion and the highest maximum cycle pressure were achieved resulting in the maximum combustion efficiency and minimum exhaust emission. If the point of ignition was placed in the middle of the prechamber or in the orifice in the partition, immediately after ignition initiation the laminar flame front was observed. This flame front was turbulised after some time from ignition initiation, however, the time to turbulisation was shortened in the case of the ignition in the middle of the prechamber. As a result, the combustion time after ignition initiation in the orifice in the partition was close to one in the original combustion chamber. Pictures in the paper present black-white high speed photography of the flame front development after ignition initiation for different ignition placements and the curves of flame front travel after the ignition.
W publikacji przedstawiono wyniki badań wizualizacyjnych procesu zapłonu w systemie spalania z dzieloną, półotwartą komorą spalania przeznaczonego dla silników o zapłonie iskrowym. System charakteryzuje się podziałem standardowej komory spalania na komorę wstępną i zasadniczą. Inicjacja zapłonu od świecy elektrycznej ma miejsce w komorze wstępnej. Przedmiotem badań był przebieg zapłonu i spalania mieszaniny w komorze wstępnej, w przypadku umieszczenia elektrod świecy zapłonowej: na ściance, w środku komory wstępnej, w otworze w przegrodzie łączącym komorę wstępną z komorą zasadniczą. Badania prowadzono przy zastosowaniu maszyny pojedynczego sprężu co pozwoliło ułatwić wizualizację procesu. Wraz z rejestracją przebiegu spalania na taśmie filmowej rejestrowano przebieg zmian ciśnienia w komorze spalania. Najlepsze efekt uzyskano w przypadku miejsca inicjacji zapłonu na ściance komory wstępnej. Wówczas czas spalania był najkrótszy, ponieważ spalanie miało charakter turbulentny. W przypadku zapłonu w środku komory wstępnej i zapłonu w otworze spalanie, bezpośrednio po zapłonie, miało charakter laminarny i dopiero po pewnym czasie następowała turbulizacja płomienia, z tym, że l w przypadku zapłonu w otworze czas ten był bardzo długi. W efekcie czas spalania, w przypadku zapłonu w otworze, j był bardzo zbliżony do czasu spalania w komorze standardowej. Najkrótsze czasy spalania uzyskiwano w przypadku zapłonu na ściance, co wyraźnie można ocenić na wykresach i fotografiach przebiegu spalania.
Źródło:: Journal of KONES; 2009, 16, 4; 277-286
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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: 6.

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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