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Tytuł:
A review of technical solutions for RCCI engines
Autorzy:
Szamrej, Grzegorz
Karczewski, Mirosław
Chojnowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2097649.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
HCCI
RCCI
dual-fuel
DDFS
silnik dwupaliwowy
Opis:
Engines working in dual-fuel mode need special conditions to ignite air-fuel mixture without spark plug in a good moment with high combustion efficiency. To create homogenous air-fuel mixture the conditions in the cylinder are even more demanding. Many concepts of ignition was developed, but the most effective needs perfect mixing of fuel and air, which is a serious technical challenge. Technical solutions for dual-fuel engines cover the complexity of these problems thus leading to the further development of ignition systems in internal combustion engines. Fuel supply systems, the operation strategy of them, the shape of the combustion chamber are the most important elements to change and develop for correct operation of dual-fuel engines. The literature analysis showed a small amount of research carried out to optimize the operation of dual-fuel engines The variety of engines in which a dual-fuel system can be used requires much more research about them, and solutions necessary for their correctly operation.
Źródło:
Combustion Engines; 2022, 61, 2; 36--46
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silniki o zapłonie samoczynnym mieszanki homogenicznej kluczem do dalszego rozwoju tłokowych silników spalinowych
Homogeneous mixture CI engines as a key to the further development of IC piston engines
Autorzy:
Szamrej, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2147158.pdf
Data publikacji:
2021
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
silnik spalinowy
silnik o zapłonie samoczynnym
mieszanki homogeniczne
silnik dwupaliwowy
ZS
RCCI
DUAL FUEL
HCCI
PCCI
PPCI
PCI
SPCCI
SACI
internal combustion engines
CI engines
homogeneous mixture
dual-fuel engine
ENGINES
Opis:
W artykule przedstawiono syntetycznie sposoby zapłonu mieszanki paliwowo-powietrznej w silnikach spalinowych wraz z charakterystyką ich kluczowych wad oraz zalet, problematyką ich stosowania oraz możliwością rozwoju. Dalszy rozwój tłokowych silników będzie wymagał drastycznego ograniczenia emisji szkodliwych składników spalin oraz dwutlenku węgla będącego najistotniejszym gazem cieplarnianym emitowanym przez silniki spalinowe. Z tego powodu zmianom muszą ulec nie tylko same silniki spalinowe, lecz także przede wszystkim stosowane paliwa. Aby były najskuteczniejsze, powinno się wykorzystywać samozapłon homogenicznej mieszanki paliwowo-powietrznej, co przy dzisiejszym stanie rozwoju technicznego nie jest możliwe w sposób pozwalający na realizację najbardziej zaawansowanych sposobów samozapłonu. W literaturze zagranicznej można znaleźć wiele publikacji dotyczących różnych sposobów zapłonu samoczynnego (ZS) w silnikach spalinowych, w tym zapłonu samoczynnego w silnikach dwupaliwowych. W literaturze krajowej nie ma jednak na ten temat wielu pozycji i choć można znaleźć prace dotyczące zapłonu samoczynnego w silnikach jednopaliwowych [1-10], to temat dwupaliwowego zasilania silników o ZS nie jest zbyt obszernie opisany. Z tego powodu godne uwagi wydaje się opublikowanie artykułu poruszającego ten istotny dziś temat.
The article presents synthetically the methods of ignition of the air-fuel mixture in Internal Com-bustion (IC) engines along with the characteristics of their advantages and disadvantages, the problems of their use and the possibility of development. The further development of piston engines will require a drastic reduction in the emission of harmful exhaust components and carbon dioxide, which is the most important greenhouse gas emitted by IC engines. For this reason, not only the engines themselves must be changed but fuels as well. For the most effective use of them, self-ignition of a homogeneous fuel-air mixture should be implemented. In the present state of technical development is not possible to widespread use the most ad-vanced ways of self-ignition methods. Typical homogeneous charge compression ignition (HCCI), where an engine uses only one type of the fuel and correctly self-ignite in the full scope of work is still not implemented in a serial production. In the foreign literature, there is a significant number of publications on various methods of Compression Igni-tion (CI) in IC engines, including IC in Dual Fuel (DF) engines. The Polish literature, however, is extremely sparse in this matter, and one can find a number of works on CI in single-fuel engines [1-10], but the topic of DF fueling is not too extensively described. For this reason, it seems important to publish an article on this important topic today
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2021, 70, 4; 15--58
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of engine speeds and dimethyl ether on methyl decanoate HCCI combustion and emission characteristics based on low-speed two-stroke diesel engine
Autorzy:
Wang, Shiye
Yao, Li
Powiązania:
https://bibliotekanauki.pl/articles/258938.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
homogeneous charge compression ignition (HCCI)
methyl decanoate (MD)
dimethyl ether (DME)
speed
NOx emission
Opis:
The combustion and emission characteristics of homogeneous charge compression ignition (HCCI) fuelled by methyl decanoate (MD) with different engine speeds and dimethyl ether (DME) mixing ratios are investigated in this work. Engine data of a MAN B&W 6S70MC low-speed two-stroke marine diesel engine were used for the reactor. The results show that a decrease of engine speed has little effect on the in-cylinder temperature and pressure of the engine at constant excess air coefficient of 1.5. Meanwhile, NOx emissions decrease with a decrease of engine speed in pure MD HCCI combustion. The results also indicate that NOx and CO2 emissions decrease significantly with an increase in the percentage of DME in MD and DME mixing combustion at a constant total mole fraction and engine speed of 85 revolutions per minute (r/min).
Źródło:
Polish Maritime Research; 2020, 2; 85-95
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrocarbon species in SI and HCCI engine using winter grade commercial gasoline
Autorzy:
Elghawi, Usama
Mayouf, Ahmed
Tsolakis, Athanasios
Powiązania:
https://bibliotekanauki.pl/articles/2097456.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
homogeneous charge compression ignition
HCCI
gas chromatography-mass spectrometry
GC-MS
hydrocarbon speciation
regulated emissions
unregulated emissions
zapłon samoczynny mieszanki jednorodnej
chromatografia gazowa ze spektrometrią mas
specjacja węglowodoru
emisje regulowane
emisje nieregulowane
Opis:
The study provides a qualitative and quantitative analysis of the C5-C11 hydrocarbon species generated in Spark Ignition - Homogeneous Charge Compression Ignition (SI/HCCI) gasoline direct injection (GDI) engine at range of operating conditions. The presented results and data were obtained from the combustion of winter grade commercial gasoline containing 2% w/w ethanol (C2H5OH) for the engine operated in steady-state, fully warmed-up condition. The hydrocarbon analysis in exhaust gases was executed on a Gas Chromatography-Mass Spectrometer (GC-MS) apparatus directly connected to the engine exhaust via heated line. The highest concentration of the total hydrocarbon emissions was obtained under low load HCCI engine operation at stoichiometric fuel-air ratio. The major hydrocarbon compounds detected in the collected samples were benzene, toluene, p-xylene, and naphthalene. Benzene originates from the incomplete combustion of toluene and other alkylbenzenes which are of considerable environmental interest. During the SI engine operation, increase of the engine speed and load resulted in the increase of benzene and the total olefinic species with simultaneous decrease in isopentane and isooctane. The same trends are seen with the engine operating under HCCI mode, but since the combustion temperature is always lower than SI mode under the same engine conditions, the oxidation of fuel paraffin in the former case was less. As a result, the total olefins and benzene levels in HCCI mode were lower than the corresponding amount observed in SI mode. Aromatic compounds (e.g., toluene), except for benzene, were produced at lower levels in the exhaust when the engine speed and load for both modes were increased.
Źródło:
Combustion Engines; 2020, 59, 1; 17--24
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Duel fuel compression ignition engine fuelled with homogeneous mixtures of propane and kerosene-based fuel
Autorzy:
Skrzek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/133333.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
dual-fuel engine
kerosene-based fuel
propane
HCCI process
low NOx emissions
silnik dwupaliwowy
paliwo na bazie nafty
propan
spalanie mieszanki jednorodnej
niska emisja NOx
Opis:
The paper presents some results of examination of DF CI engine fuelled with kerosene-based fuel (Jet A-1) and propane. The aim was to obtain the maximum engine thermal and overall efficiency and checking the engine emissions for the application of significant share of propane as a main source of energy. The fuel which initiates the ignition was Jet A-1 provided by common rail system during the beginning of compression stroke. Propane was provided to inlet manifold in a gas phase. The method of providing of both fuels to the engine cylinder allowed to create nearly homogeneous mixture and realized HCCI process for dual fuelling with Jet A-1 and propane. It was possible to compare two combustion strategies PCCI and HCCI for fuelling of CI engine with single fuel (Jet A-1) and dual fuelling with Jet A-1 and propane. The results of experiment show that the NOx and soot emissions are much lower than for standard CI or SI engines. The results also show very interesting potential role of propane in control of HCCI dual fuel combustion process which gives the new perspective of dual fuel engine development. The low levels of toxic components in exhaust gases encourage to test and develop this type of fuelling which could radically confine the negative influence on the environment as well as enable to apply an alternative fuels.
Źródło:
Combustion Engines; 2019, 58, 3; 191-197
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of combustion timing on pressure rise rates in a residual effected HCCI engine
Autorzy:
Hunicz, Jacek
Gęca, Michał
Kordos, Paweł
Rybak, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/134242.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
HCCI
boost
pressure rise rate
szybkość przyrostu ciśnienia
Opis:
Realization of a low temperature combustion concept in homogeneous charge compression ignition (HCCI) engines is a cutting-edge technology that offers clean combustion in parallel with high thermal efficiency. Low combustion temperature prevents from NOx formation whereas homogeneous mixture assures smokeless exhaust. However, achieving the production feasibility by HCCI technology is hampered by high pressure rise rates and the resulting combustion noise at a high load operation. This paper explores combustion timing parameters that are capable of maintaining permissible levels of pressure rise rates under a high load regime. On the basis of experimental data collected at a high load HCCI operation, pressure rise level was correlated with combustion duration. Furthermore, combustion duration has been found to scale with in-cylinder volume, for which 50% of mass fraction burned appeared. The results showed quantitatively limitations of engine load, pointing out on required combustion timings to achieve acceptable combustion harshness depending on engine load.
Źródło:
Combustion Engines; 2019, 58, 3; 46-50
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Influence analysis of detonations related to output characteristics and to damage level of engine parts in order to eliminate potential risks and ensure reliability of the HCCI technology
Autorzy:
Puškár, M.
Kopas, M.
Puškár, D.
Powiązania:
https://bibliotekanauki.pl/articles/198699.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
analysis
detonation
reliability
HCCI technology
analiza
detonacja
niezawodność
technologia HCCI
Opis:
The engine output characteristic offers very important information during the real application of the HCCI technology. This kind of combustion process significantly influences the wearing degree of the main engine components or even the engine damage. The principle of the HCCI combustion is basically beneficial, however, it can also be destructive. Described in this article are measurements of the engine output characteristics in the case of an experimental piston combustion engine. These measurements were performed by means of a data recording system, whereby the detonation combustion was evaluated using a quantitative method. The real values of atmospheric conditions and fuel mixture composition were added to the measured values. The resulting values were visually compared with a degree of the engine piston damage caused by the detonations. The final result is a limit value, which represents a maximal number of the detonation units that are permissible in order to ensure reliable operation of the HCCI engine.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 102; 151-163
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Ion Current Measurement to Identification of Combustion Parameters in a Homogeneous Charge Compression Ignition Engine
Autorzy:
Hunicz, J.
Filipek, P.
Sobiesiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/221670.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HCCI
ion current
heat release rate
combustion control
Opis:
This study examines the application of ion current measurements to the identification of heat release parameters inside the combustion chamber of a homogeneous charge compression ignition (HCCI) engine fuelled with gasoline. HCCI combustion was achieved with the use of exhaust gas trapping. Combustion parameters derived from the in-cylinder pressure and ion current measurements were compared and analysed. Ion current measurements were accomplished using the existing spark plug and a dedicated electronic circuit. The experiments were performed at a variable excess air ratio and a variable amount of trapped residuals. The results showed a good correlation between peak values of the ion current and heat release rate, except for the cases where a fuel-rich mixture was burnt. The computed ion current integral over the volume of the combustion chamber showed a good agreement with the heat released in the combustion chamber, however this parameter was found to be affected by the amount of trapped residuals. Combustion timing characteristic values computed using heat release and ion current were found to be correlated, however the relationship was not linear.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 223-234
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic and management system specified for control of engine equipped with the HCCI combustion technology
Autorzy:
Puškár, M.
Kopas, M.
Puškár, D.
Powiązania:
https://bibliotekanauki.pl/articles/329596.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostic system
management
control
HCCI technology
system diagnostyczny
zarządzanie
kontrola
technologia HCCI
Opis:
On the present there is very intensively emphasized the environmental protection, which is also connected with reduction of emissions produced by the vehicles. The actual European emission standard EURO 6 will be replaced very soon with the new and even stricter standard EURO 7. There is a well-known fact that the new regulations are demanding with regard to the NOX emissions. However, there is at disposal a suitable technical solution, namely in the form of an innovative engine technology, which is called the HCCI. A principle of this technology consists in a self-ignition of the homogenous air-fuel mixture using the compression process. Combustion of the mixture is performed in the whole compression volume without a spark ignition, whereby the NOX emission level is almost negligible. However, this technology is also characterised by several serious problems, for example there is occurring a complication concerning control of the self-ignition phenomenon. The presented article introduces an original diagnostic system, which enables to control the whole self-ignition system and in this way to ensure a reliable operation of the HCCI engine. This system is patented now as well as it was tested in an experimental vehicle built for the international competition “shell eco marathon”.
Źródło:
Diagnostyka; 2018, 19, 4; 39-44
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of pressure rise rates in boosted HCCI engine using advanced valve actuation strategies
Autorzy:
Hunicz, J.
Rybak, A.
Gęca, M.
Powiązania:
https://bibliotekanauki.pl/articles/243727.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
low temperature combustion
HCCI
valve actuation
combustion harshness
Opis:
Homogeneous Charge Compression Ignition (HCCI) is a promising low temperature combustion technology which offers high fuel efficiency and extremely low exhaust emissions. However, there are still some pending issues to be resolved before the technology will achieve mass production level. Namely, combustion controllability should be improved and HCCI operating range should be widen. The latter is constrained by excessive combustion rates under high loads. In this study, advanced variable valve actuation strategies were applied to control auto-ignition timings and combustion rates. The examinations were conducted using single-cylinder research engine fuelled with directly injected gasoline. The HCCI combustion was achieved using negative valve overlap technique. The engine was run under boosted conditions, in an operation regime where acceptable pressure rise rate (PRR) level is usually exceeded. Selected valve timing sweeps were carried out within a scope of the experiments to evaluate PRR reduction potential. The obtained results manifested superior combustion controllability. Late exhaust valve closing enabled reduction of the amount of internally re-circulated exhaust, which propagated to the main event combustion. From the intake side, two effects were observed, i.e. variability of the intake air aspiration and variability of the apparent compression ratio. Both phenomena were found to affect combustion timings and rates.
Źródło:
Journal of KONES; 2018, 25, 4; 369-376
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation into the effect of direct fuel injection on thermal stratification in HCCI engine
Autorzy:
Gęca, M.
Hunicz, J.
Jaworski, P.
Powiązania:
https://bibliotekanauki.pl/articles/133917.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
homogeneous charge compression ignition
HCCI
direct injection
thermal stratification
computational fluid dynamics
CFD
silnik wysokoprężny o spalaniu homogenicznym
wtrysk bezpośredni
stratyfikacja termiczna
obliczeniowa mechanika płynów
Opis:
Despite the fact that HCCI engines are distinguished by mixture homogeneity, some degree of stratification always appears inside a combustion chamber. It is especially applied to residual effect engines utilizing negative valve overlap. Mixture stratification is a result of the imperfect mixing of fresh air with trapped residuals. Direct fuel injection introduces stratification as well, due to fuel vaporization. As a consequence, the temperature within the combustion chamber is uneven. Thermal stratification affects auto-ignition timing and combustion evolution in a high extent. The purpose of this study was to evaluate a degree of thermal stratification in HCCI engine utilizing negative valve overlap. Investigations were performed using three-dimensional CFD model of the combustion system, made by using AVL FIRE software. Simulations were realized for various timings of fuel injection into the cylinder. It was found that fuel injection timing had a significant effect on the thermal stratification and resulting auto-ignition timing.
Źródło:
Combustion Engines; 2017, 56, 2; 137-140
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of spark assist on HCCI combustion
Autorzy:
Hunicz, J.
Gęca, M.
Kordos, P.
Medina, A.
Powiązania:
https://bibliotekanauki.pl/articles/134201.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
HCCI
homogeneous charge compression ignition
spark assist
double Wiebe
silnik wysokoprężny o spalaniu homogenicznym
Opis:
HCCI (homogeneous charge compression ignition) combustion is initiated by compression temperature and is independent of spark discharge. However, spark discharge can be applied under certain conditions to achieve hybrid combustion, where combustion by flame propagation is followed by auto-ignition of the unburned mixture. Spark assist can be applied to improve combustion stability at low loads or to reduce pressure rise rates under high load regime. In the current study variable spark ignition timing was applied for stoichiometric HCCI combustion, achieved using negative valve overlap technique. Under investigated conditions increase of nitrogen oxides emissions, due to flame propagation, was not observed. To provide more insight into combustion evolution, double Wiebe function was fitted to experimental heat release rates. It was found that only less than 10% of mixture was burned by flame propagation, even for very advanced spark discharge.
Źródło:
Combustion Engines; 2015, 54, 2; 73-77
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic simulation comparison of AVL BOOST and Ricardo WAVE for HCCI and SI engines optimization
Autorzy:
Alqahtani, A.
Shokrollahihassanbarough, F.
Wyszynski, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/133607.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
HCCI
homogeneous charge compression ignition
SI
numerical simulation
software platform
AVL BOOST
Ricardo WAVE
silnik wysokoprężny o spalaniu homogenicznym
silnik ZI
symulacja numeryczna
Opis:
The aim of this paper is to compare two simulation software platforms, AVL BOOSTTM and Ricardo WAVETM as used to simulate HCCI and SI GDI engines with the intention of maximising the engine’s efficiency and minimising the emissions. This paper compares these platforms in an experimentally validated model to analyse a spark ignition and a Homogeneous Compression Ignition Charge (HCCI) single cylinder 4 valve gasoline engines with multiple configurations and running parameters in order to find the most optimal set-up for the engine, with the prospect of allowing an optimum engine to be built and tested in real world conditions without the need for multiple expensive prototypes and long delays.
Źródło:
Combustion Engines; 2015, 54, 2; 68-72
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the ignition control in the HCCI system using dose of monoatomic inert gas
Autorzy:
Postrzednik, S.
Przybyła, G.
Żmudka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/248032.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IC engine
HCCI system
ignition control
charge compression
Opis:
The subject of the analysis presented in the paper is the idea and implementation method of the ignition point of homogeneous air-fuel mixture, used in the IC engine with HCCI system. Autoignition of the combustible mixture can occur only upon reaching the characteristic self-ignition temperature Tz. It should take place during (near end) the load compression. In order to achieve the fuel mixture ignition temperature Tz in the system, usually it is proposed adjusting the engine compression ratio, epsilon. However, it is quite cumbersome especially in case of frequent changes of engine load (there are also difficulties with the precise advance angle adjusting of fuel mixture ignition). According to our conception, the other method of autoignition adjustment can be successfully applied. The essence of the new idea consists in proper selection, according to engine load, of the exponent k of charge polytropic compression. Introducing the defined dose of monoatomic gas (e.g. argon Ar,k almost equal 1.667) to air-fuel mixture, the higher values of the polytropic compression exponent .. of working medium can be achieved. It will result in significant increase of the temperature rise Delta Tmax of the compressed charge and accordingly progressive increase of the advance angle of the mixture ignition.
Źródło:
Journal of KONES; 2012, 19, 1; 319-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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