A zero-dimensional code is developed to simulate turbulent spray combustion and NOx and soot emission in direct injection diesel engines. The code consists of two major parts; mixing calculation for the probability density function (PDF) based on the multi-zone model by Hiroyasu et al., (1983) and the flame structure by the conditional moment closure (CMC) model (Klimenko & Bilger, 1999). The skeletal mechanism of n-heptane is employed with the elementary reaction steps for heat release and the NOx chemistry in GRI 3.0. The spray model accounts for evaporation and mixing based on momentum balance of the spray zones, while the CMC model incorporates the conditional flame structures with one fuel group or flame structure for each injection. The spatially integrated density-weighted PDF, F(η), is defined to represent inhomogeneous mixture distribution in the cylinder. The one-equation soot model is employed for prediction of the soot emission. The program has been validated over a wide range of load and rpm with different injection schedules and EGR levels. Comparison shows reasonable agreement with measurements for the pressure trace and the NOx and soot emissions for all 16 cases with a single set of tuned constants.


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    Titel :

    Zero-Dimensional Simulation of Diesel Engine Combustion and Emissions Based on CMC Model and Skeletal Reaction Mechanism


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Lee, Dongkyu (Autor:in) / Kwon, Jaesung (Autor:in) / Seo, Jaeyeob (Autor:in) / Huh, Kang Y. (Autor:in)

    Kongress:

    SAE 2011 World Congress & Exhibition ; 2011


    Erschienen in:

    Erscheinungsdatum :

    2011-04-12


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :



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    Shenghua,L. / Hwang,J.W. / Park,J.K. et al. | Kraftfahrwesen | 1999


    3-dimensional modeling of diesel engine intake flow, combustion and emissions

    Reitz,R.D. / Rutland,C.J. / Univ.of Wisconsin-Madison,US | Kraftfahrwesen | 1993


    Three dimensional modeling of diesel engine intake flow, combustion and emissions

    Reitz,R.D. / Rutland,C.J. / Univ.of Wisconsin-Madison,US | Kraftfahrwesen | 1995