Seven biofuel-diesel fuel configurations were tested in a single-cylinder research diesel CFR engine that allowed variable injection timing. These seven configurations included three biodiesel-diesel blends (20% and 100%); two ethanol-diesel blends (15% and 20%), and two cases in which ethanol was injected into the intake air flow (20% and 33%). Combustion characteristics, NOx emissions, and soot emissions were compared with diesel operation across a range of injection timings. The effect of fuel compressibility affected the timing of injection, with biodiesel-diesel blends having advanced injection and ethanol-diesel blends having delayed injection. Biodiesel-diesel blends showed reduced ignition delay with only modest changes in combustion duration, while ethanol-diesel mixtures showed longer ignition delay but much shorter combustion duration and earlier phasing. In general, all the biofuel-diesel configurations improved thermal efficiency (∼3% relative) but increased fuel consumption to a greater extent due to lower energy content. None of the seven configurations had a large effect on NOx emissions. Soot was slightly lower for both biodiesel-diesel and blended ethanol-diesel. However, premixing ethanol with intake air using a port-fuel injector lowered soot by approximately 50%.


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    Titel :

    Combustion of Biodiesel- and Ethanol-Diesel Intake Injection Mixtures with


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Jones, B. C. (Autor:in) / Gutteridge, C. E. (Autor:in) / Leahey, D. M. (Autor:in) / Cowart, J. S. (Autor:in) / Gilligan, J. W. (Autor:in) / Hamilton, L. J. (Autor:in) / Brown, L. P. (Autor:in) / Caton, P. A. (Autor:in)

    Kongress:

    SAE 2007 Commercial Vehicle Engineering Congress & Exhibition ; 2007



    Erscheinungsdatum :

    2007-10-29




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch