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    Wyświetlanie 1-9 z 9
    Tytuł:
    Theoretical analysis of air-fuel mixture formation in the combustion chambers of the gas engine with two-stage combustion system
    Autorzy:
    Jamrozik, A.
    Tutak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/201585.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-stage combustion system
    prechamber
    stratified mixture
    dwustopniowy system spalania
    komora wstępna
    mieszanina warstwowa
    Opis:
    The results of theoretical analysis of a mixture formation process during the compression stroke in a prechamber of the IC (internal combustion) gas engine with the stratified mixtures two-stage combustion system were presented in the paper. The course of excess air-fuel ratio changes in prechamber at ignition time λkz in function of degree of the mixture condensation during the compression stroke φ expressing quotient of a temporary cylinder and prechamber volume and maximal value of the volume were estimated. Research concerning λkz sensitivity on changes of rich combustible mixture composition delivered to the prechamber by the additional fuel supply system λko, mixture composition in cylinder _c and degree of filling a prechamber with the rich combustible mixture ξ were performed. According to numerical calculations it was proved that the real gas engine with the two stage combustion system at equal degree requires exact regulation of the three analysed values.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 779-790
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study on combustion characteristics of lean premixed CH4/air mixtures in RCM using spark ignition and turbulent jet ignition in terms of orifices angular position change
    Autorzy:
    Bueschke, Wojciech
    Skowron, Maciej
    Wisłocki, Krzysztof
    Szwajca, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/973119.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    CNG
    turbulent jet ignition
    prechamber
    optical analysis
    flame development
    heat release rate
    turbulentny zapłon odrzutowy
    komora wstępna
    analiza optyczna
    szybkość wydzielania ciepła
    Opis:
    The increase in ignitability consist a main aim of implementation of the turbulent jet ignition (TJI) in relation to the combustion of diluted charges. Such an ignition system has been introduced to the lean-burn CNG engine in the scope of GasOn-Project (Gas Only Internal Combustion Engines). In this study the impact of TJI application on the main combustion indexes has been investigated using RCM and analyzed on the bases of the indicating and optical observations data. The images have been recorded using LaVision HSS5 camera and post-processed with Davis software. Second part of the study based on indicating measurements consist the analysis of combustion regarding the variation in the geometry of pre-chamber nozzles. It has been noted, that combustion with TJI indicates significantly bigger flame luminescence and simultaneously - faster flame front development, than the combustion initiated with conventional SI. The positive impact of nozzles angular position on engine operational data has been found in the static charge movement conditions, regarding the combustion stability.
    Źródło:
    Combustion Engines; 2019, 58, 1; 36-41
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental comparison of efficiency and emission levels of four-cylinder lean-burn passenger car-sized CNG engines with different ignition concepts
    Autorzy:
    Soltic, Patric
    Hilfiker, Thomas
    Hutter, Richard
    Hänggi, Severin
    Powiązania:
    https://bibliotekanauki.pl/articles/133343.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    dual-fuel
    diesel pilot
    spark ignition
    prechamber
    silnik dwupaliwowy
    silnik Diesla
    zapłon iskrowy
    komora wstępna
    Opis:
    Today’s passenger car CNG engines are based on petrol engines which typically have restrictions preventing the exploitation of the full potential of methane based fuels, especially if they have to be operated also on petrol as a second fuel. Additionally, the use of threeway-catalysis limits the engine operation to λ = 1. Here, we present the efficiency potential and the raw emission characteristics for a dedicated four cylinder passenger car CNG engine without sticking to the usual combustion peak pressure and λ limitations. Lean combustion reduces the knocking tendency but, because of the higher pressure levels, increases the ignition energy demand. Therefore, different ignition systems (spark plug, prechamber, Diesel pilot) have been used.
    Źródło:
    Combustion Engines; 2019, 58, 1; 27-35
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lean-burn CNG engine with ignition chamber: from the idea to a running engine
    Autorzy:
    Weißner, Michael
    Beger, Frank
    Schüttenhelm, Martin
    Tallu, Gunesh
    Powiązania:
    https://bibliotekanauki.pl/articles/133168.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    CNG
    scavenged prechamber
    lean combustion
    ignition system
    efficiency
    oczyszczona komora wstępna
    spalanie ubogie
    układ zapłonowy
    wydajność
    Opis:
    Current and further developing CO2 and emission regulations worldwide and the competition to full electric mobility deliver a challenge for internal combustion engines in general. A state of the art solution is the use of natural gas mainly contending methane to reduce CO2 significantly and to offer lowest emission levels. The EU-funded project GasOn developed engine concepts to fully exploit the advantages of CNG. This article describes the development of an innovative, monovalent engine dedicated to Compressed Natural Gas (CNG) and characterised by the lean burn concept and the innovative pre-chamber combustion.
    Źródło:
    Combustion Engines; 2019, 58, 1; 3-9
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of fuel and turbulence distributions in an automotive-sized scavenged pre-chamber
    Autorzy:
    Bolla, Michele
    Shapiro, Evgeniy
    Kotzagianni, Maria
    Kyrtatos, Panagiotis
    Tiney, Nick
    Boulouchos, Konstantinos
    Powiązania:
    https://bibliotekanauki.pl/articles/133134.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    scavenged prechamber
    Reynolds-averaged Navier-Stokes
    RANS
    large-eddy simulation
    LES
    mixture formation
    oczyszczona komora wstępna
    tworzenie mieszanki
    Opis:
    This article presents a numerical study of the fuel and turbulence distributions in a pre-chamber at spark-time. The study has been conducted in the framework of the H2020 Gas-On project, dealing with the development of a lean-burn concept for an automotive-sized gas engine equipped with a scavenged pre-chamber. The test case considered studies a 7-hole pre-chamber with circumferentially-tilted orifices mounted on the cylinder head of a rapid compression-expansion machine (RCEM), consistent with the experimental test rig installed at ETH Zurich. An accurate description of turbulence and fuel distributions are key quantities determining the early flame development within the pre-chamber. Both quantities have an influence on the overall combustion characteristics and therefore on the engine performance. For this purpose, computational fluid dynamics (CFD) is employed to complement experimental investigations in terms of data completeness. The performance of the Reynolds-averaged Navier-Stokes (RANS)-based turbulence model is compared with large-eddy simulation (LES) through ensemble averaging of multiple LES realizations, in which the fuel injection rate evolution into the pre-chamber has been perturbed. Overall, RANS results show that the distributions of the turbulent kinetic energy and fuel concentration at spark-time agree well with the LES ensemble-averaged counterparts. This constitutes a prerequisite in view of the combustion phase and the accuracy reported provides further confidence in this regard.
    Źródło:
    Combustion Engines; 2019, 58, 1; 61-67
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical investigation of prechamber combustion in an RCEM
    Autorzy:
    Kotzagianni, Maria
    Kyrtatos, Panagiotis
    Boulouchos, Konstantinos
    Powiązania:
    https://bibliotekanauki.pl/articles/133545.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    scavenged prechamber
    optical measurements
    ignition timing
    oczyszczona komora wstępna
    pomiary optyczne
    czas zapłonu
    Opis:
    In this study, detailed investigations of scavenged prechamber engine combustion are performed experimentally in a Rapid Compression Expansion Machine (RCEM), which allows optical access into the main chamber. OH* chemiluminescence measurements combined with pressure measurements are used to study the effect of varying ignition timing on combustion and cycle-to-cycle variations. The variation of ignition timing (pressure at ignition) showed an optimum ignition point for a given injection duration. Earlier ignition resulted in weaker but more reactive jets, coupled to increased cyclic variations. Later ignition did not significantly affect heat release rate, but increased cyclic variation.
    Źródło:
    Combustion Engines; 2019, 58, 1; 10-15
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prechamber optimal selection for a two stage turbulent jet ignition type combustion system in CNG-fuelled engine
    Autorzy:
    Pielecha, Ireneusz
    Bueschke, Wojciech
    Skowron, Maciej
    Fiedkiewicz, Łukasz
    Szwajca, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/133967.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gas engine
    prechamber
    thermodynamic analysis
    combustion
    exhaust emission
    optimization
    silnik gazowy
    komora wstępna
    analiza termodynamiczna
    spalanie
    emisja spalin
    optymizacja
    Opis:
    Searching for further reduction of fuel consumption simultaneously with the reduction of toxic compounds emission new systems for lean-mixture combustion for SI engines are being discussed by many manufacturers. Within the European GasOn-Project (Gas Only Internal Combustion Engines) the two-stage combustion and Turbulent Jet Ignition concept for CNG-fuelled high speed engine has been proposed and thoroughly investigated where the reduction of gas consumption and increasing of engine efficiency together with the reduction of emission, especially CO2 was expected. In the investigated cases the lean-burn combustion process was conducted with selection of the most effective pre-combustion chamber. The experimental investigations have been performed on single-cylinder AVL5804 research engine, which has been modified to SI and CNG fuelling. For the analysis of the thermodynamic, operational and emission indexes very advanced equipment has been applied. Based on the measuring results achieved for different pre-chamber configurations the extended methodology of polioptimization by pre-chamber selection and the shape of main chamber in the piston crown for proposed combustion system has been described and discussed. The results of the three versions of the optimization methods have been comparatively summarized in conclusions.
    Źródło:
    Combustion Engines; 2019, 58, 1; 16-26
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influences of the pre-chamber orifices on the combustion behavior in a constant volume chamber simulating pre-chamber type medium-speed gas engines
    Autorzy:
    Wakasugi, Takuya
    Tsuru, Daisuke
    Tashima, Hiroshi
    Powiązania:
    https://bibliotekanauki.pl/articles/2202520.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gas engine
    prechamber
    torch flame
    combustion visualization
    natural gas
    silniki gazowe
    komora wstępna
    płomień palnika
    wizualizacja spalania
    gaz ziemny
    Opis:
    The study aims to clarify the influence of pre-chamber (PC) configurations on the combustion process in the main chamber (MC) of medium-speed spark-ignition gas engines equipped with an active PC. A constant volume combustion chamber was prepared to simulate the chamber configurations of the gas engines. A high-speed shadowgraph was applied to visualize the torch flame development and the combustion process in the MC. Experiments were done by changing the charged gas in the MC, the number, and the diameter of the PC orifices. Combustion was most accelerated when the PC orifice configuration was set appropriately so that the adjacent torch flames would combine with each other. It was also found that the unburned mixture in the PC, which ejected prior to the torch flame, supported the penetration of the torch flame.
    Źródło:
    Combustion Engines; 2022, 61, 4; 66--76
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possible applications of prechambers in hydrogen internal combustion engines
    Autorzy:
    Matla, Jędrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2202513.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    hydrogen combustion
    hydrogen knock
    prechamber
    H2ICE
    combustion engine
    spalanie wodoru
    stuk wodorowy
    komora wstępna
    silnik spalinowy
    Opis:
    In order to ensure better control of the combustion process in a internal combustion engine powered by hydrogen, it has been proposed to use a split combustion chamber solution. Following paper contains a description of a hydrogen combustion system that includes an analysis of possible technical solutions. The considerations take into account the issues of the dual nature of hydrogen knocking and the problem of burning a stratified charge of a hydrogen-air mixture in a cylinder.
    Źródło:
    Combustion Engines; 2022, 61, 4; 77--82
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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