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Tytuł:
Experiments on the upper explosion limits of gaseous alkanes-oxygen mixtures at elevated conditions of T and P in a spherical vessel
Badania górnej granicy wybuchowości (GGW) mieszanin gazowych alkanów w tlenie w naczyniu kulistym w warunkach podwyższonej temperatury T praz ciśnienia p
Autorzy:
Rarata, G.
Szymczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/213842.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
górna granica wybuchowości (GGW)
naczynie kuliste
warunki podwyższonej temperatury
warunki podwyższonego ciśnienia
flammability
explosive limits
flammability limits
elevated conditions
explosion pressure
Opis:
This experimental work has been completed in the Institute of Heat Engineering Laboratories of Warsaw University of Technology. The article reports on the explosion pressure data and the influ-of chosen physical parameters on the value of the Upper Explosive Limit (UEL) of gaseous alkanes-oxygen mixtures. Such explosion behavior data of common gases for different initial con-ditions are essential fora quantitative risk assessment in many industrial environments. A number of higher alkanes-oxygen mixtures were examined (up to n-butane). Summarized research data is presented in the paper. All the presented data have been obtained from the experiments conducted in a 2.3 dm' spherical, steel vessel. Exploding wire was used as the mean of ignition source. It released about 0.1 J energy each time. The pressure histories in the combustion vessel have been recorded by means of piezoelectric pressure transducer. The influence of the increased initial temperatures of the tested mixtures on their value of UEL was investigated in the range of 20°C up to 200°C. Further experiments on the influence of elevated pressure, as well as the position of the igignition source, were carried out too. The experiments allowed the authors to find a distinct dependencies in the values of obtained UEL under elevated conditions of pressure and temperature.
Przedstawiona praca doświadczalna została wykonana w laboratoriach Instytutu Techniki Cieplnej Politechniki Warszawskiej. Artykuł zawiera wyniki serii pomiarów, których celem bylo ustalenie wpływu wybranych parametrów fizycznych na wartość ciśnienia wybuchu dla mieszanin gazowych alkanów z tlenem. Dane takie, łącznie z wyznaczoną wartością górnej granicy wybuchowości (GGW) dla poszczególnych mieszanin, mają podstawowe znaczenie dla ustalania odpowiednich norm bezpieczeństwa w przemyśle chemicznym. Badaniom poddano gazowe alkany, a więc metan, etan, propan oraz n-butan. Wyniki, prezentowane w postaci sumarycznych danych (tabel) zostały uzyskane w wyniku przeprowadzenia pomiarów w stalowym naczyniu kulistym o objętości 2,3 dm3. Jako źródło zapłonu użyto tzw. eksplodujacy drucik (exploding wire), który uwalniał za każdym razem okolo 0,1J energii. Przebieg zmian ciśnienia w czasie rejestrowano przy użyciu szybkiego czujnika piezoelektrycznego. Zbadano wpływ ternperatury początkowej mieszanin testowych, w zakresie od 20°C do 200°C. Przeprowadzono również pomiary w zakresie wzrastajacego ciśnienia początkowego mieszanin. Na ich podstawie autorzy wyznaczyli wyraźne zależności GGW od początkowej wartaści T oraz p badanych mieszanin.
Źródło:
Prace Instytutu Lotnictwa; 2009, 5 (200); 160-167
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Research of combustion system with semiopen combustion chamber in a commercial spark ignition engine
Badania systemu spalania z półotwartą komorą spalania w silniku produkcyjnym o zapłonie iskrowym
Autorzy:
Leżanski, T.
Sęczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/245775.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SI engines
combustion
combustion chamber of piston engines
exhaust emission
Opis:
During the research of a new combustion system with semi-open combustion chamber for SI engines with use of the rapid compression machine (RCM) and visualisation experimental engine (VEE) it was proved that the application of this system results in shortening of the combustion time, increasing of the maximum cycle pressure and, in effect, increase of the combustion efficiency. The aim of the research using a commercial spark ignition engine was to prove that the similar results (as in RCM and VEE) could be obtained in a wide range of automotive engine operating parameters. In this research the two cylinder, four stroke air cooled SI engine, with volume displacement 650 cm3 from Fiat 126 motorcar was used. This engine was fitted with a modified cylinder head and ignition distributor. Two types ofprechamber with different shape were installed in different locations into the cylinder head but the ignition distributor had fixed, preadjusted, ignition advance angle in the full range of engine speed. The wide open throttle characteristics including power, specific fuel consumption and exhaust emission versus engine speed and load characteristics including: specific fuel consumption and exhaust emission versus engine torque were determined for different ignition advance angles. In the lower range of the ignition advance angle the engine showed stable operation at lower speed but unstable at high speed and, inversely, if the ignition advance angle was high the engine operation was stable at the higher speed and unstable at the lower. The engine characteristics during unstable operation were deteriorating. The research results show that improvement of the engine characteristics can be obtained in the full range of operating parameters ifthe ignition advance angle is varied continuously with the variation of engine speed. The ignition advance angle for the engine fitted with the new combustion system, which was subject of this research, was different form the ignition advance angle for standard engine.
W badaniach prowadzonych przy zastosowaniu maszyny pojedynczego sprężu oraz badawczego silnika wizualizacyjnego, stwierdzono, że zastosowanie systemu z półotwartą komorą spalania może spowodować: skrócenie czasu spalania w komorze spalania, zwiększenie ciśnienia maksymalnego cyklu oraz zwiększenie sprawności spalania. Celem badAn w silniku produkcyjnym było wykazanie, że takie pozytywne efekty można uzyskać również w szerokim zakresie parametrów pracy trakcyjnego silnika spalinowego. Badania prowadzono przy zastosowaniu silnika samochodu Fiat 126p. W badaniach stosowano dwie różne głowice, w których zainstalowano w różnych miejscach i o różnym kształcie wstępną komore spalania oraz zmodernizowany aparat zapłonowy. Określono charakterystyki zewnętrzne i obciążenlowe przy różnych konfiguracjach komory spalania, różnych wartościach kąta wyprzedzenia zapłonu dla dwóch wartości współczynnika nadmiaru powietrza. W przypadku małych wartości kąta wyprzedzenia zapłonu uzyskiwano poprawę osiągów oraz zmniejszenie toksyczności spalin w zakresie niskich prędkości obrotowych, natomiast silnik pracował niestabilnie w zakresie wysokich prędkości obrotowych i odwrotnie, kiedy stosowano wysokie wartości kąta wyprzedzenia zapłonu uzyskiwano poprawę osiągów w zakresie wysokich prędkości obrotowych, natomiast silnik pracował niestabilnie w zakresie niskich wartości prędkości obrotowych. Uzyskane wyniki pokazują, że dzięki zastosowaniu systemu z półotwartą komorą spalania, o właściwie dobranych parametrach systemu, można uzyskać poprawę osiągów silnika oraz zmniejszenie toksyczności spalin w całym zakresie pracy silnika trakcyjnego
Źródło:
Journal of KONES; 2009, 16, 3; 203-211
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
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
Artykuł
Tytuł:
Research of combustion system with semi-open combustion chamber in a commercial spark ignition engine
Autorzy:
Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/246474.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SI engines
combustion
combustion chamber of piston engines
exhaust emission
Opis:
During the research of a new combustion system with semi-open combustion chamber for SI engines with use of the rapid compression machine (RCM) and visualisation experimental engine (VEE) it was proved that the application of this system results in shortening of the combustion time, increasing of the maximum cycle pressure and, in effect, increase of the combustion efficiency. The aim of the research using a commercial spark ignition engine was to prove that the similar results (as in RCM and VEE) could be obtained in a wide range of automotive engine operating parameters. In this research the two cylinder, four-stroke air-cooled SI engine, with volume displacement 650 cm³ from Fiat 126 motorcar was used. This engine was fitted with a modified cylinder head and ignition distributor. Two types of prechamber with different shape were installed in different locations into the cylinder head but the ignition distributor had fixed, preadjusted, ignition advance angle in the full range of engine speed. The wide-open throttle characteristics including power, specific fuel consumption and exhaust emission versus engine speed and load characteristics including: specific fuel consumption and exhaust emission versus engine torque were determined for different ignition advance angles. In the lower range of the ignition advance angle the engine showed stable operation at lower speed but unstable at high speed and, inversely, if the ignition advance angle was high the engine operation was stable at the higher speed and unstable at the lower. The engine characteristics during unstable operation were deteriorating. The research results show that improvement of the engine characteristics can be obtained in the full range of operating parameters if the ignition advance angle is varied continuously with the variation of engine speed. The ignition advance angle for the engine fitted with the new combustion system, which was subject of this research, was different form the ignition advance angle for standard engine.
Źródło:
Journal of KONES; 2016, 23, 4; 283-290
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
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
Artykuł
Tytuł:
Experiments on the upper explosion limits of gaseous alkanes-oxygen mixtures at elevated conditions of T and P in a spherical vessel
Autorzy:
Rarata, G.
Szymczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/242309.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
explosive limit
flammability limit
elevated conditions
explosion pressure
Opis:
This experimental work has been completed in the Institute of Heat Engineering Laboratories of Warsaw University of Technology. The article reports on the explosion pressure data and the influence of chosen physical parameters on the value of the Upper Explosive Limit (UEL) of gaseous alkanes-oxygen mixtures. Such explosion behavior data of common gases for different initial conditions are essential for a quantitative risk assessment in many industrial environments. A number of higher alkanes-oxygen mixtures were examined (up to n-butane). Summarized research data is presented in the paper. All the presented data have been obtained from the experiments conducted in a 2.3 dm3 spherical, steel vessel. Exploding wir e was used as the mean of ignition source. It released approx. 0.1 J energy each time. The pressure histories in the combustion vessel have been recorded by means of piezoelectric pressure transducer. The influence of the increased initial temperatures of the tested mixtures on their value of UEL was investigated in the range of 20°C up to 200°C. Further experiments on the influence of elevated pressure, as well as the position of the ignition source, were carried out too. The experiments allowed the authors to find distinct dependencies in the values of obtained UEL under elevated conditions of pressure and temperature.
Źródło:
Journal of KONES; 2009, 16, 2; 393-399
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Research of influence of design parameters on combustion system operation for SI engines
Badania wpływu parametrów konstrukcyjnych na pracę systemu spalania dla silników o zapłonie iskrowym
Autorzy:
Leżanski, T.
Sęczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/245689.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
silniki spalinowe o zapłonie iskrowym
maszyna pojedynczego sprężu
spalanie
wizualizacja procesu
SI engine
rapid compression machine
combustion visualisation of the combustion process
Opis:
The summary of the investigation performed with a new combustion system with divided semi-open combustion chambers for SI engines while using rapid compression machine (RCM) is presented in this paper. Division of the combustion chamber with partition to the prechamber and the main combustion chamber exists only when the piston is close to the TDC, for the rest of the cycle the chambers are fully open. Variable parameters of the combustion system during the tests were: ratio of the prechamber volume to the sum of the prechamber and main combustion chamber volumes, diameter of the orifice in the partition, point of the ignition and ignition advance angle (ignition timing). Constant parametr es were: RCM speed — 1800 rpm, and stoichometric mixture of air to natural gas- it contained 96% ofmethane. research results show that the ignition advance angle, which ensures the optimal results, has to be adjusted for each configuration of the RCM design parameters. The influence of prechamber volume, orifice diameter, point of ingnition and ignition advance angle on combustion process in the combustion chamber was analysed. If the prechamber volume is too small the energy of the stream is small and the stream has a small range. Its energy is too small to travel through all the main combustion chamber with the speed greater than the combustion speed. The partition orifice diameter influences on the time from the start of the ignition to the beginning of the stream outflow.from prechamber to the main combustion chamber and the stream energy. The biggest influence on stream formation process has the placement of the ignition and the best results are obtained when the ignition occured on the prechamber wall. The high speed Schilieren photographs of the combustion process of the most characteristic cases and of the travel of the flame front curves are shown in this paper. The research results show the direction of the trade - off investigation of commercial SI engine for a wide range of engine speed and loads.
W publikacji podsumowano wyniki badań prowadzonych nad nowym systemem spalania dla silników o zapłonie iskrowym, w którym dokonano podziału standardowej komory spalania na komorę wstępną i komorę zasadniczą. Przy tym podział ten występuje wyraźnie tylko wówczas, kiedy tłok znajduje się w pobliżu GMP. Badania prowadzono przy zastosowaniu maszyny pojedynczego sprężu. Zmiennymi parametrami konstrukcyjnymi były: stosunek objętości komory wstępnej do całkowitej objętości komory spalania, średnica otworu w przegrodzie łączącego komorę wstępną z komorą zasadniczą, miejsce zapłonu. Badania prowadzono przy różnych wartościach kąta wyprzedzenia zapłonu, przy stałej prędkości obrotowej wału korbowego 1800 obr./min. Paliwem była stechiometryczna mieszanina powietrza z gazem ziemnym zawierającym 96% metanu. Wyniki badań wskazują, że dla uzyskania pozytywnego efektu konieczne jest dobranie odpowiedniego kąta wyprzedzenia zapłonu dla każdej konfiguracji parametrów konstrukcyjnych (objętość komory wstępnej, średnica otworu w przegrodzie, miejsce zapłonu). W pracy przeanalizowano wypływ: stosunku objętości komór spalania wstępnej do zasadniczej, średnicy otworu w przegrodzie oraz miejsca zapłonu na przebieg spalania i stwierdzono, że przy zbyt małej objętości komory spalania energia strugi jest zbyt mała, aby przemieścić się z dużą prędkością przez całą zasadniczą komorę spalania, większą niż prędkość spalania w komorze standardowej. Średnica otworu w przegrodzie wpływa zarówno na czas od początku zapłonu do początku wypływu jak i energię strugi. Miejsce zapłonu najsilniej wpływa na proces tworzenia się strugi. W publikacji przedstawiono fotografie z przebiegiem spalania w najbardziej charakterystycznych przypadkach oraz wykresy przemieszczeń czoła płomienia w przypadku różnych fotografii parametrów badań
Źródło:
Journal of KONES; 2009, 16, 4; 265-276
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Some problems of combustion system operation with semi-open combustion chamber for spark ignition engine
Autorzy:
Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/247782.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SI engine
rapid compression machine
combustion
combustion process visualization
ignition advance angle
Opis:
The some problems concern of the new combustion system operation with semi open combustion chamber, which can be used in spark ignitions internal combustion engines are presented in this paper. These considerations are based on the visualization research results, with using rapid compression machine (RCM). In this researched combustion system the original combustion chamber was divided by partition in prechamber and main combustion chamber. This division of the original combustion chamber exists only when the piston is close to TDC, for the rest of the cycle the chambers arefully open. Ignition is initiated in the prechamber using electric spark plug, but the mixture in main combustion chamber is ignited by the stream of the burned gases injected from prechamber through the orifice in partition, if the ignition advance angle is correct. If the ignition advance angle is incorrect the mixture from prechamber will be outflowing through the orifice in partition and through the slot which is created between the partition and piston crowns. This last stream is swirled on the partition edge, what causes decrease of the stream speed outflowed from the orifice in partition to main combustion chamber. If the ignition advance angle is too big, then a peak pressure and compression work is very big because the burned gases are compressed instead of the fresh air/fuel mixture. This causes that the effective work is small and combustion efficiency is small.
Źródło:
Journal of KONES; 2010, 17, 4; 287-294
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Research of flame propagation in combustion system with semi-open combustion chamber for gasoline SI engines
Autorzy:
Leżański, T.
Sęczyk, J.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/242275.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SI engines
engine combustion systems
combustion process visualization
Opis:
Some results of visualization researches of combustion system with divided, semi - open combustion chamber for SI engines, using rapid compression machine (RPM) and experimental visualization engine (EVE) are presented in his paper. Short description of combustion system operation, description of test stands and research equipment can be found in the paper. The tests were performed at stoichiometric ratio natural gas-air and propane-air mixtures. A few the most characteristic of results are shown; to explain how should be operate the combustion system, to yield the better performance. They are compared the research results (photographs of combustion sequence, diagrams of in-cylinder pressure histories) during visualization testing with using RCM and EVE. During RCM testing we obtained the combustion photographs in the plain pass in cylinder axis but during ECE testing at the plain perpendicular to the cylinder axis. All researches shown that the best performance are yielded when a spark advance angle (ignition timing) is such selected that stream outflow prechamber to main combustion chamber starts when the piston is at TDC and it has adequate energy to travel a main combustion chamber with higher velocity than burning velocity in quiescent chamber. Then the shortest time of combustion, the highest peak pressure in the cycle and bigger useful working are yielded. The impact of spark advance angle on flame propagation process into combustion chamber in extreme cases has been analyzed too.
Źródło:
Journal of KONES; 2011, 18, 2; 251-260
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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