The current study utilized 3-D computational fluid dynamics (CFD) combustion analysis to guide the development of a viable full load range combustion strategy in a light-duty gasoline compression ignition (GCI) engine. A higher reactivity gasoline that has a research octane number (RON) of 70 was used for the combustion strategy development. The engine has a geometric compression ratio of 14.5 with a piston bowl designed to accommodate different combustion strategies and injector spray patterns. Detailed combustion optimization was focused on 6 and 18 bar gross indicated mean effective pressure (IMEPg) at 1500 rpm through a Design of Experiments approach. Two different strategies were investigated: (a) a late triggering fuel injection with a wide spray angle (combustion strategy #1); and (b) an early triggering fuel injection with a narrow spray angle (combustion strategy #2). Combustion strategy #1 preferred a higher swirl ratio, while a lower swirl ratio was more desired for combustion strategy #2. At 6 bar IMEPg, high efficiency clean GCI operation can be achieved using both strategies. When increasing the engine load to 18 bar IMEPg, combustion strategy #2 was limited by excessive pressure rise rate. In contrast, by carefully balancing between premixed combustion and mixing-controlled combustion, combustion strategy #1 led to fuel-efficient mixed-mode combustion operation. By utilizing this combustion strategy, full load operation at 24 bar IMEPg was achieved while meeting all the performance requirements. Both combustion strategies favored a larger number of nozzle holes. Combustion strategy #1 generally showed a stronger preference towards higher injection pressure.


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    Titel :

    CFD-Guided Combustion Strategy Development for a Higher Reactivity Gasoline in a Light-Duty Gasoline Compression Ignition Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Cleary, David (Autor:in) / Cho, Kukwon (Autor:in) / Engineer, Nayan (Autor:in) / Zhang, Yu (Autor:in) / Pei, Yuanjiang (Autor:in)

    Kongress:

    WCX™ 17: SAE World Congress Experience ; 2017



    Erscheinungsdatum :

    2017-03-28




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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