Results of comparisons of computed and measured soot and NO in a direct-injection Diesel engine are presented. The computations are carried out using a three-dimensional model for flows, sprays and combustion in Diesel engines. Autoignition of the Diesel spray is modeled using an equation for a progress variable which measures the local and instantaneous tendency of the fuel to autoignite. High temperature chemistry is modeled using a local chemical equilibrium model coupled to a combination of laminar kinetic and turbulent characteristic times. Soot formation is kinetically controlled and soot oxidation is represented by a model which has a combination of laminar kinetic and turbulent mixing times. Soot oxidation appears to be controlled near top-dead-center by mixing and by kinetics as the exhaust is approached. NO is modeled using the Zeldovich mechanism. For individual cases, computed and measured chamber pressure agree within 5%, computed and measured soot profiles agree within 10% and computed and measured NO agree within 30%. More importantly, from case to case the model reproduces trends in emissions adequately.


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    Titel :

    Three-Dimensional Modeling of Soot and NO in a Direct-injection Diesel Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Abraham, J. (Autor:in) / Hou, Z.-X. (Autor:in)

    Kongress:

    International Congress & Exposition ; 1995



    Erscheinungsdatum :

    01.02.1995




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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