Combustion during normal and knocking cycles has been observed in a single cylinder, spark ignition engine. Photographs of combustion in a disc chamber showed that autoignition of the end gas was the cause of knock. Normal flame propagation was found to decelerate more quickly becoming stationary about two degrees before autoignition became visible.By contrast flame propagation was similar for normal and knocking cycles in a compact chamber. However pressure rises in excess of 8 bar/degree at 1500 rpm occurred during knocking cycles. It was concluded that knock resulted from rapid entrainment and burning of reactants by the normal spark ignited flame.


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    Title :

    Photography of Combustion During Knocking Cycles in Disc and Compact Chambers


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1988



    Publication date :

    1988-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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