Small bore diesel engines often adopt a two-valve cylinder head and a non-central injector layout to expand the port flow passage area. This non-central injector layout causes asymmetrical gas flow and fuel distribution, resulting in worse heat losseses and a less homogenous fuel-air mixture than an equivalent four-valve cylinder head layout with a central injector. To improve these problems Toyota applied a new concept which was characterized by tapered shape design on the upper portion of the piston and low compression ratio to achieve more homogeneous gas flow and fuel-air mixture. This paper describes the impact of new combustion concept and the mechanism of the improvement by 3D-CFD analysis and optical measurement.


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    Titel :

    Low Cooling Losses and Low Emission Analysis of Small Bore Diesel Engine Combustion


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Nishida, Kentaro (Autor:in) / Hasegawa, Ryo (Autor:in) / Ogawa, Takashi (Autor:in) / Hashizume, Takeshi (Autor:in)

    Kongress:

    JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting ; 2015



    Erscheinungsdatum :

    2015-09-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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