Two turbulent combustion modeling approaches, which were large eddy simulations in conjunction with detailed kinetics (LES-CHEMKIN) and Reynolds Averaged Navier Stokes with detailed kinetics (RANS-CHEMKIN), were used to model two partially premixed engine conditions. The results were compared with average pressure and heat release data, as well as images of in-cylinder ignition chemiluminescence and OH radical distributions. Both LES-CHEMKIN and RANS-CHEMKIN match well with experimental average data. However, LES-CHEMKIN has advantages over RANS-CHEMKIN in predicting the details of location of ignition sites, temperature as well as OH radical distributions. Therefore, LES offers more realistic representations of the combustion process. As a further improvement aiming at saving computational cost and accounting for turbulence-chemistry interactions, a flamelet time scale (FTS) combustion model is coupled with CHEMKIN to predict the entire combustion process. In this new approach (i.e. LES-CHEMKIN-FTS), CHEMKIN was responsible for the low-temperature phase to provide sufficient chemical kinetic information whereas the FTS model played its role in the high-temperature phase to account for subgrid mixing-chemistry effects and save CPU time. We showed that LES-CHEMKIN-FTS performed better than LES-CHEMKIN under conventional diesel-type combustion.


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    Titel :

    Combustion Modeling of Diesel Combustion with Partially Premixed Conditions


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Hu, Bing (Autor:in) / Rutland, Christopher J. (Autor:in) / Jhavar, Rahul (Autor:in) / Reitz, Rolf D. (Autor:in) / Singh, Satbir (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2007



    Erscheinungsdatum :

    2007-04-16




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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