Dual-fuel reactivity controlled compression ignition (RCCI) engine experiments were conducted with port fuel injection of isooctane and direct injection of n-heptane. The experiments were conducted at a nominal load of 4.75 bar IMEPg, with low isooctane equivalence ratios. Two sets of experiments explored the effects of direct injection timing with single and double injections, and multi-dimensional CFD modeling was used to explore mixture preparation and timing effects. The findings were that if fuel-liner impingement is to be avoided, double injections provide a 40% reduction in CO and HC emissions, resulting in a 1% increase in thermal efficiency. The second engine experiment showed that there is a linear relationship between reactivity (PRF number) and intake temperature. It was also found that if the premixed fuel fraction is above a certain limit, the high-temperature heat release (HTHR) can be manipulated by changing the global PRF number of the in-cylinder fuel blend.


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    Titel :

    Injection Effects in Low Load RCCI Dual-Fuel Combustion


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Splitter, Derek (Autor:in) / Wissink, Martin (Autor:in) / Hanson, Reed (Autor:in) / Reitz, Rolf D. (Autor:in) / Kokjohn, Sage (Autor:in)

    Kongress:

    10th International Conference on Engines & Vehicles ; 2011



    Erscheinungsdatum :

    2011-09-11




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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