The paper describes the emulation of the knock measurement equipment on the CFR engine used during octane rating. It was found during engine measurements that the low-pass filtered rate-of-change of the pressure signal from Primary Reference Fuels (PRF) established the definitive metric of standard knock intensity and that non-PRF fuels exhibited similar pressure rise rates at standard knock intensity. The effect of fuel octane number, compression ratio and air-fuel ratio was also clearly distinguishable.Further modelling interpretation revealed that a non-instantaneous, cascading autoignition was a likely origin for the measured pressure development. Thermal inhomogeneities, which were the result of a heat loss gradient in the trapped mass, served to explain the observed behaviour of both RON and MON test conditions and a range of fuels of different octane numbers. A predictive model was ultimately applied to demonstrate that the pressure development and pressure rise rate can be predicted from the physical conditions in the engine, coupled to a fuel ignition delay descriptor.


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    Titel :

    Insights into the Role of Autoignition during Octane Rating


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Swarts, André (Autor:in) / Yates, Andy (Autor:in)

    Kongress:

    2007 Fuels and Emissions Conference ; 2007



    Erscheinungsdatum :

    23.01.2007




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Insights into the Role of Autoignition during Octane Rating

    Swarts, A. / Yates, A. / Society of Automotive Engineers | British Library Conference Proceedings | 2007


    Insights into the role of autoignition during octane rating

    Swarts,A. / Yates,A. / Univ.of Cape Town,ZA | Kraftfahrwesen | 2007




    Investigation of Kinetics of Iso-Octane Autoignition

    Chen, Qisheng / Hong, Yanji / Zhao, Wentao et al. | AIAA | 2014