Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "HCCI" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 21
Tytuł:
Wpływ temperatury początkowej i składu mieszaniny palnej na pracę silnika HCCI zasilanego biogazem
The impact of initial temperature and combustible mixture composition on work of biogas-operated HCCI engine
Autorzy:
Motyl, K.
Lisowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/290301.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
silnik spalinowy
HCCI
zapłon samoczynny
biogaz
paliwo alternatywne
combustion engine
spontaneous ignition
biogas
alternative fuel
Opis:
W pracy przedstawiono wyniki badań wpływu temperatury początkowej i składu mieszaniny palnej na pracę silnika działającego według koncepcji HCCI. Stwierdzono, że istnieje określona wartość temperatury początkowej mieszaniny (około 200°C), po osiągnięciu której dalszy jej wzrost nie powoduje wyraźnego zwiększania ciśnienia maksymalnego spalania, prędkości narastania ciśnienia i opóźnienia samozapłonu. Wartość tej temperatury zależy nieznacznie od składu mieszaniny palnej.
The paper presents results of the research carried out on the impact of initial temperature and combustible mixture composition on work of engine based on the HCCI principle. The researchers found that there is a specific value of the mixture initial temperature (approximately 200°C). When it is reached, further temperature rise does not cause any distinct increase of combustion process maximum pressure, pressure buildup rate and self-ignition delay. This initial temperature value slightly depends on combustible mixture composition.
Źródło:
Inżynieria Rolnicza; 2008, R. 12, nr 1(99), 1(99); 311-317
1429-7264
Pojawia się w:
Inżynieria Rolnicza
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:
Simulation of work of an engine working with combustion initiation from ignition dose of fuel
Autorzy:
Sendyka, B.
Mitianiec, W.
Noga, M.
Powiązania:
https://bibliotekanauki.pl/articles/245989.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
modelling
simulation
combustion engine
HCCI
two stage injection system
Opis:
The paper presents analysis of fuelling and of the course of combustion process for a two-cycle engine. The main idea of the engine according to patent solution of Prof. B. Sendyka consists in the fact that engine work begins from spark ignition, whereas, at higher load and higher temperature in the cooling system there occurs switching off spark ignition and transition to ignition from an ignition dose injected directly into the combustion chamber. Such an engine possesses two injection systems: one system of multi-point injection which forms homogenous mixture, whereas, the other system of direct injection is used for ignition dose injection only. After injection of the ignition dose of a very small mass combustion is initiated on the basis of formation of auto-ignition centres so as it takes place during knock combustion. Auto-ignition centres initiate combustion of the basic charge. Simulation was carried out in order to perform analysis occurring phenomena of fuel feeding and combustion. Works on it started from elaboration of a computational grid of the engine and subsequently analysis of indicated diagrams of engine work with injection of ignition dose was performed. Analysis was also performed of temperature traces and of traces of charge mass change in the cylinder as well as of participation of the mass of basic fuel dose in the cylinder in function of the crank angle. Moreover visualization of effects of the process of mixture formation and combustion was performed and presented in form of illustrations of charge temperature distribution, fraction of fuel ignition and basic dose vapours in cross-sections of the combustion chamber.
Źródło:
Journal of KONES; 2011, 18, 3; 395-403
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
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:
Preliminary investigations of the HCCI combustion system in a single cylinder research engine
Autorzy:
Motyl, K.
Lisowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/246468.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
thermodynamics
internal combustion engines
HCCI
combustion process
exhaust emission
bio-fuel
Opis:
This paper describes the results of the preliminary experimental research of the HCCI combustion system in a single cylinder research engine fuelled by means of natural gas containing 95% methane. In this research, influence of the initial temperature of the charge and mixture composition on the maximum combustion pressure, maximum speed of pressure growth, selfignition delay time, combustion time, maximum combustion temperature, heat release and combustion efficiency have been studied. The paper contains: description of the engine modification to adopt it for HCCI operation requirements, applied measurements equipment, selected results of the experimental research. The results shows that initial charge temperature and mixture composition (relative air/fuel ratio coefficient) have essential influence on the engine operating results. The experimental research has been conducted for the varied initial charge temperature from 140 centigrade up to 210 centigrade and for varied relative air/fuel ratio coefficient 1=1; 1=1.5; 1=1.7; 1=2. Maximum charge pressure, maximum speed of pressure growth selfignition delay time was rather unaffected on the initial charge temperature increase beyond 200 centigrade. Previous and current author's research works have indicated that extremely low emissions and high combustion efficiencies are possible to reach if homogeneous charge compression ignition is applied.
Źródło:
Journal of KONES; 2007, 14, 3; 429-436
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:
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:
Increase of high load limit in a gasoline HCCI engine
Autorzy:
Hunicz, J.
Kordos, P.
Gęca, M.
Powiązania:
https://bibliotekanauki.pl/articles/242189.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
HCCI engine
negative valve overlap
high load limit
mechanical boost
Opis:
Engine operation in HCCI mode allows for improvement of thermal efficiency and substantial reduction NOX emission. The most production feasible solution for gasoline HCCI engine is application of exhaust gas trapping using a negative valve overlap. This technique increases thermal energy of a mixture, thus allowing for auto-ignition at moderate compression ratios. However, high exhaust gas re-circulation rate decreases volumetric efficiency. As a result, achievable engine loads are also reduced. Supercharging can be applied in order to improve volumetric efficiency and extend high load limit. However, increase of amount of intake air can lead to reduction of start of compression temperature via decrease of residuals in a mixture. In order achieve HCCI mode of combustion, temperature of start of compression must be kept within narrow limits. In this study experimental and modeling investigations were presented. Experiments were carried out using single cylinder research engine. The engine was equipped with fully variable valvetrain and direct gasoline injection. Application of mechanical boosting allowed for widening achievable load range in HCCI mode of operation. Numerical calculations allowed for determination of admissible valvetrain settings and intake pressure, which guarantee proper temperature of start of compression.
Źródło:
Journal of KONES; 2012, 19, 4; 231-238
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
HCCI engine - idea and expectations. Case study
Autorzy:
Kowalewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/244203.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
HCCI engine
auto-ignition control
Opis:
Internal combustion engines yet have not exhausted their development possibilities in the range of economy and ecology demands. Development of SI and CI engines, which several years ago proceeded individually in-parallel, now becomes likely in common: one type of engine shares some features with the other one, e.g. direct injection, electronically controlled injectors, electronic control unit etc. However, type of ignition and mixture formation are still different (spark assisted ignition versus auto ignition and homogeneous mixture versus heterogeneous). HCCI engine overcomes this difference. At present HCCI engine uses both type of ignition modes and both types of mixture in different ranges of operational parameters. Direct injection during compression stroke and stratified charge are characteristics for low and mild power resulting in low emission of CO and HC as well as NOx. Combustion is initiated by spark when mixture is very poor. For maximum load and speed, auto-ignition of homogeneous stoichiometric mixture takes place in the whole volume of combustion chamber. Due to the absence of flame and low temperature, nitrogen oxides, of which molecules arise in post flame zone, are low. Also emission of CO and HC are low due to stoichiometry of the mixture. The key problem is controlled auto-ignition as a function of speed and load (fully HCCI engine). Several methods of auto-ignition control (CAI) are discussed in this paper.
Źródło:
Journal of KONES; 2008, 15, 2; 217-224
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
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:
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:
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
Wyświetlanie 1-15 z 21

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies