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    Wyświetlanie 1-3 z 3
    Tytuł:
    Natural gas engines - problems and challenges
    Autorzy:
    Kowalewicz, A.
    Wojtyniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/243241.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engine
    natural gas
    dual-fuel engine
    combustion duration
    knock
    Opis:
    At former KONES one of the co-authors presented a paper, is which general information about natural gas properties, reserves, production and distribution were given and application to SI and CI engines was presented, compared and discussed. It was shown, that more promising is dual-fuel CI engine. There is a lot of information on combustion, emissions and performances of dual-fuel natural gas engines, but there are also blank areas and controversial opinions, which were pointed out and discussed in this paper. For example: why combustion processes are delayed in comparison with combustion of diesel fuel only. It is also not clear whether noise of dual-fuel engine is higher than that of diesel engine or lower (there are contradictory data). These problems are shown and discussed in this paper. The proposal of further research is presented. Ignition and combustion in dual-fuel natural gas engines is yet not fully recognized, especially: combustion duration, mechanism at gaseous and condensed phase burning, kinetics and diffusion controlled combustion, noise, knock and cycle-by-cycle variation. Optimization of control parameters on account of efficiency and emissions is still an open problem. Influence of natural gas composition and its changes on engine performance and emissions still demand estimation.
    Źródło:
    Journal of KONES; 2007, 14, 2; 273-282
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The onset of knock in gas fuelled spark ignition engines prediction and experiment
    Autorzy:
    Karim, G. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/244289.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engine
    gas engine modelling
    engine performance knock criterion
    Opis:
    An approach for predicting the onset of knock and estimating its intensity in spark ignition engines is described. It is based on evaluating a dimensionless energy functional group, Kn, formulated to provide a numerical criterion to test continually, while using predictive models of the performance of spark ignition engines, for the onset of knock and its relative intensity at any instant during the combustion process. The basis for the derivation of this knock criterion and its significance are described. Examples involving gaseous fuels and their mixtures under different operating conditions show how the criterion can be employed for the prediction of the onset of knock and the associated knock-limited performance. It is shown that this approach can be made an integral part of modeling spark ignition engine operation to be used for optimizing engine performance while ensuring throughout the avoidance of the onset of knock. Among other things variations relative energy release and end gas mass fraction during flame propagation for non-knocking and border line knocking conditions, variations in the calculated knock criterion value with time for knock free, light and heavy knocking conditions, with compression ratio for hydrogen and methane as a fuel CFR engine, calculated optimum spark timing maximum power variation the probability of the incidence of knock versus spark timing, the suppression of the onset of knock through lean operation or cooled EGR are illustrated in the paper.
    Źródło:
    Journal of KONES; 2007, 14, 4; 165-175
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    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 1-3 z 3

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