Wszystkie pola: advance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of ignition timing advance on the CNG natural gas combustion in SI engine
Autorzy:: Flekiewicz, M.
Kubica, G.
Fabiś, P.
Powiązania:: https://bibliotekanauki.pl/articles/241679.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: CNG passenger car engine
combustion analysis
ignition advance
Opis:: A significant reduction of CO2 emission in the road transport is a major challenge for next years. In the combination with efficient powertrain technologies, the potential of natural gas is excellent for comparably light and cost effective reduction of CO2 and toxic emission in the future [1-2]. As the CNG fuelling stations in Poland are not so far widespread enough to make a dedicated natural gas vehicle practical, it results necessary to start with proposing alternatively CNG powered engines. Such a bi-fuel automotive engines are necessary to bridge the gap between petrol and natural gas. As a sample of modern engine design an Opel 1.6 litre 4-cylinder engine has been selected as a base of powertrain for development of bi-fuelpassenger car engine. The influence of ignition timing on CNG combustion process has been presented in this paper. A 1.6 litre SI engine has been tested in the special program. For selected engine operating conditions, following data were acquired: in cylinder pressure, crank angle, fuel mass consumption and exhaust gases temperatures. For the settings of 6, 9, 12 and 15 deg crank angle timing advance correction, the internal temperature of combustion chamber has been estimated, as well as the charge combustion ratio and ratio of heat release were tested. With the help of the mathematical model, emissions of NO, CO and CO2 were additionally estimated. Obtained results made it possible to compare the influence of ignition timing advance on natural gas combustion in SI engine.
Źródło:: Journal of KONES; 2008, 15, 4; 123-131
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The effect of fuel injection parameters on the combustion process in a self-ignition engine
Autorzy:: Imiołek, M.
Piętak, A.
Wierzbicki, S.
Powiązania:: https://bibliotekanauki.pl/articles/243984.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: injection pressure
injector opening time
fuel injection advance angle
Opis:: This paper presents the effect of the main parameters of fuel injection, such as injection angle and injector opening time, on the combustion process in a self-ignition engine. The study continues the research aimed at optimising the bi-fuel feeding of self-ignition engines with a main fuel dose of methane (CNG). The results described in the paper apply to a HATZ 1B40 one-cylinder engine, which was adapted for being powered with methane. Examinations of the engine powered with a pilot dose of mechanically-injected diesel oil revealed the necessity to adjust the fuel injection advance angle. To this end, the mechanical system offuel supply was replaced with a Common Rail, with controllable fuel injection pressure, fuel injection advance angle and injector opening time. The results presented in the paper show the characteristics of the injector output depending on the fuel pressure in the Common Rail and on the duration of the electric impulse which opens the injector. Moreover, the article presents examples of pressure courses in the combustion chamber at a constant fuel dose and with a different fuel injection advance angle. An example of the combustion pressure course at a constant fuel dose and variable injection pressure and injector opening time is given.
Źródło:: Journal of KONES; 2010, 17, 3; 143-148
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 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

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Skocz do pozycji: 4.

Tytuł:: Effect of the parameters of pilot dose injection in a dual fuel diesel engine on the combustion process
Autorzy:: Wierzbicki, S.
Powiązania:: https://bibliotekanauki.pl/articles/246181.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diesel engine
injection pressure
injector opening time
fuel injection advance angle
course of combustion
Opis:: The paper presents the effect of the main parameters of pilot dose ignition: injection pressure, injection advance angle and injector opening time on the combustion process in a dual fuel diesel engine. The study continues the research conducted at the Department of Mechatronics of the University of Warmia and Mazury, Olsztyn, on optimisation of dual fuel self-ignition engines with CNG as the main fuel dose. The results presented in the paper were obtained with a single-cylinder engine HATZ 1B40, adapted to methane combustion. The results presented in the paper show the recorded changes of pressure in the combustion chamber with a constant fuel pilot dose and different ignition advance angles. Scheme of fuelling and measurement systems, view of engine indicating system, average changes of pressure in the combustion chamber, average changes of pressure in the combustion chamber and average changes of pressure in the combustion chamber at dual fuel engine supply with diesel oil at varied pilot dose injection angle, effects of advance angle of the pilot dose injection on the maximum pressure of combustion, at various proportions of diesel oil and CNG, average changes of pressure in the combustion chamber at double-fuel engine fuelled with diesel oil and various shares of methane in the dose powering the engine, CNG consumption as a function of the advance angle of the pilot dose injection for various shares of the pilot dose are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 3; 499-506
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: An influence of correction of the ignition advance angle on the combustion process in SI engine fuelled by lpg with the addition of DME
Autorzy:: Kubica, Grzegorz
Marzec, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/243249.pdf
Data publikacji:: 2019
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dimethyl ether
DME+LPG
fuel blend
SI engine
Opis:: The paper presents the results of tests of the SI engine fuelled by LPG with the addition of DME in the form of a mixture of gaseous fuels. Experimental tests were carried out on a chassis dynamometer in the full range of engine loads, at a fixed rotational speed: 2000, 2500 and 3000 rpm. The use of dimethyl ether (DME) as a fuel component makes it possible to exploit its important advantages. DME can be produced as a renewable fuel, which is important from the point of view of ecology. Another important fact is the presence of oxygen in this fuel, which has a positive effect on the engine volumetric efficiency. During the tests, the ignition timing was also adjusted due to the very good DME flammability. Two additional correction levels were applied, increasing the ignition advance by 3 and 6 CA degrees, compared to the factory settings of the driver. The analysis of the obtained results allowed determining the dependence of the basic engine parameters, in the function of the correction of ignition advance angle. In the summary, attention was also paid to the possibility of determining corrected maps of the ignition advance angle taking into account the variable proportions of fuel components.
Źródło:: Journal of KONES; 2019, 26, 4; 285-292
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Researches of possibilities of lowering the toxicity of ship diesel exhaust gases by changing the chosen control parameters
Badanie możliwości obniżenia toksyczności spalin silników okrętowych przez zmianę wybranych parametrów regulacyjnych
Autorzy:: Witkowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/242693.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: okrętowe silniki spalinowe
zanieczyszczenie atmosfery
ciśnienie powietrza doładowania
kąt wyprzedzenia wtrysku paliwa
diesel ship engines
atmospheric pollution
charging air pressure
fuel injection advance angle
Opis:: This paper describes the issues of atmospheric pollution created by ship engines. Not long ago the most important issue of ship engine construction was to lower fuel consumption and achieve high durability and reliability. In the recent years another problem has risen. A ship engine must meet more and more strict demands made on account of natural environment - the emission of toxic combustion products to the atmosphere. Although the share of ship engines in global toxic product emission was only 7% nitric oxides (NOx) and 4 - 5% sulphur oxides (SOx), the International Maritime Organization (IMO) and the Marine Environment Protection Committee (MEPC) in November of1990 proposed to reduce the emission of NOx by 70% and SOx by 50% by the year 2000. As the outcome of conducted procedures appropriate changes were made to MARPOL Convention in the form of Appendix VI. In this paper the effects of the influence of the chosen regulation parameters changes (charging air pressure and fuel injection advance angle) on the contents of the exhaust gasses of a diesel engine burning heavy oil fuel are presented and discussed. Necessary research was carried out in Gdynia Maritime Academy. Extraordinary attention was paid to successful reduction of nitric oxides (NOx) in the exhaust gasses. It was proven that decreasing the charging air pressure and increasing the fuel injection delay together lead to significant reduction of the amount of nitric oxides in ship engine exhaust gasses burning heavy oil fuel. Laboratory research was carried out using heavy fuels in a close-to-real environment. Therefore their results may be taken under consideration by ship owners. Considering the possibility of making necessary adjustments by the ship crew, which would lead to similar results, this method could also be used in practice, especially on older engines which usually do not conform to MARPOL Convention, Appendix VI with their nitric oxides emissions.
Artykuł poświęcony jest problemom związanym z zanieczyszczaniem atmosfery przez silniki okrętowe. Do niedawna najważniejszym problemem w budowie silników okrętowych było zmniejszenie zużycia paliwa oraz osiągnięcie ich dużej trwałości i niezawodności. W ostatnich latach pojawił się kolejny problem. Silnik okrętowy musi spełniać coraz ostrzejsze wymagania stawiane ze względu na ochronęśrodowiska naturalnego - emisję toksycznych produktów spalania do atmosfery. Wprawdzie udział silników okrętowych w emisji toksycznych składników wynosi w skali globalnej około 7% w przypadku tlenków azotu (NOx) i 4-5% dla tlenków siarki (SOx), to jednak Międzynarodowa Organizacja Morska (IMO) i Komitet d/s Ochrony Środowiska Morskiego (Marine Environment Protection Committee - MEPC) przy IMO, w listopadzie 1990 roku zaproponowały zmniejszenie emisji do 2000 roku NOx o 70% i SOx o 50%. W wyniku prowadzonej procedury legislacyjnej odpowiednie zapisy wprowadzono do konwencji MARPOL w postaci załącznika VI. W artykule zaprezentowano i przedyskutowano poparte wynikami badań laboratoryjnych przeprowadzonych w Akademii Morskiej w Gdyni rezultaty wpływu zmian wybranych parametrów regulacyjnych (ciśnienia powietrza ładującego i kąta wyprzedzenia wtrysku) na skład spalin silnika wysokoprężnego zasilanego paliwem ciężkim. W badaniach w szczególności zwracano uwagę na skuteczną możliwość obniżenia w spalinach zawartości tlenków azotu (NOx). Wykazano, że spadek ciśnienia powietrza ładującego i wzrost opóźnienia wtrysku paliwa wprowadzone łącznie, prowadzą do istotnego obniżenia zawartości tlenków azotu w spalinach silnika okrętowego pracującego na paliwie ciężkim. Badania laboratoryjne przeprowadzono na paliwach ciężkich, a więc w warunkach zbliżonych do rzeczywistych. Ich rezultaty mogą być więc brane pod uwagę przez armatorów. Z uwagi na możliwość wykonania przez załogę statku regulacji silnika pozwalającej na osiągnięcie podobnych rezultatów, metoda sprawdzona w badaniach laboratoryjnych, może być również właściwa w praktyce, szczególnie w odniesieniu do silników wcześniej budowanych, które zazwyczaj nie spełniają normy emisji tlenków azotu wskazanej w załączniku VI Konwencji MARPOL.
Źródło:: Journal of KONES; 2007, 14, 4; 531-536
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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