In this paper, we investigate the effects of autoignition on the heat release characteristics of a spark-ignition (SI) engine, under knocking conditions. In a normal, flame-propagation combustion, the heat release rate increases smoothly to a maximum, and then progressively decreases as the entire mixture is consumed. When autoignition occurs, the heat release rate profile shows a departure from its normal profile: since autoignition results in an explosive combustion, an abnormal rapid increase in heat release rate is generated, with significantly higher peak heat release rates and faster fuel consumption. Three distinct heat-release-rate profiles for autoignition can be identified at different engine speeds, which differ in the phasing of the sudden increase in release rate due to autoignition, relative to the peak release rate due to normal combustion. At higher engine speeds, the autoignition-induced heat release rate peak can be clearly discriminated since it occurs after the peak release rate of normal combustion. This is normally not the case at lower engine speeds. In the paper, an algorithm to reliably determine autoignition for the 3 types of heat-release-rate profiles will be presented, followed by a study to characterize the heat release at different engine speeds.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Characterization of Autoignition in a Knocking SI Engine Using Heat Release Analysis


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    Powertrain & Fluid Systems Conference and Exhibition ; 2006



    Erscheinungsdatum :

    16.10.2006




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Characterization of autoignition in a knocking spark ignition engine using heat release analysis

    Borg,J.M. / Alkidas,A.C. / Hitachi America,US et al. | Kraftfahrwesen | 2006


    The Autoignition of Isobutane in a Knocking Spark Ignition Engine

    Parker, C. D. / Westbrook, C. K. / Green, R. M. et al. | SAE Technical Papers | 1987


    The autoignition of isobutane in a knocking spark ignition engine

    Green,R.M. / Parker,C.D. / Pitz,W.J. et al. | Kraftfahrwesen | 1987


    Investigation of the Effects of Autoignition on the Heat Release Histories of a Knocking SI Engine Using Wiebe Functions

    Borg, J.M. / Alkidas, A.C. / Society of Automotive Engineers | British Library Conference Proceedings | 2008