The presented concept in this study consists of a state of the art passenger car natural-gas engine fired by different hydrogen (H2) and compressed-natural-gas (CNG) fuel blends. The hydrogen content in the fuel was varied among 5 and 15vol% corresponding to 0.6-2.1 mass%, while comparisons include also engine operation on pure CNG.Increasing hydrogen content of the fuel accelerated combustion leading to modest efficiency improvements. Combustion analysis showed that the increasing burning rates mainly affected the initial combustion phase (duration for 5% mass fraction burned).With optimal combinations of spark timing and EGR rate the achievements are additional efficiency increase with substantially lower engine-out NOx while total unburned hydrocarbons or CO-engine-out emissions are not affected.Investigations using Design of Experiments (DoE) algorithms provided a comprehensive picture of the entire parameter space. The investigations showed two fuel consumption optimal combustion domains: Low EGR and late spark timing with associated high engine-out NOx emissions as well as high EGR and early spark timing with very low engine-out NOx.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Combustion Characteristics of Hydrogen-Natural Gas Mixtures in Passenger Car Engines


    Additional title:

    Sae Technical Papers


    Contributors:
    Rechsteiner, C. (author) / Boulouchos, K. (author) / Dimopoulos, P. (author) / Soltic, P. (author) / Hotz, R. (author)

    Conference:

    8th International Conference on Engines for Automobiles ; 2007



    Publication date :

    2007-09-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Combustion characteristics of hydrogen-natural gas mixtures in passenger car engines

    Dimopoulos,P. / Boulouchos,K. / Rechsteiner,C. et al. | Automotive engineering | 2007



    Combustion Characteristics of Small Spark Ingition Engines Using Hydrogen Supplemented Fuel Mixtures

    Varde,K.S. / Univ.of Michigan Dearborn,Dep.of Mech.Engng.,US | Automotive engineering | 1981


    Combustion characteristics in hydrogen fueled rotary engines

    Morimoto,K / Teramoto,T. / Takamori,Y. et al. | Automotive engineering | 1992


    Ideal homogeneous combustion versus partly homogeneous combustion for passenger car diesel engines

    Haas,S. / Bargende,M. / Berner,H.J. et al. | Automotive engineering | 2007