A model developed to predict outoignition is used with data from a premixed charge, spark-ignition engine. A detailed chemical kinetics mechanism is used to predict the reactions which occur in the end-gas and lead to autoignition. Experimental pressure data from a CFR engine are used in the model to determine end-gas temperatures.The initial temperature at the time of spark must be increased above the bulk temperature for the predicted time of outoignition to agree with the observed time. A method for estimating the initial temperature based on an adiabotic compression from the time of intake valve closing is presented.The predictions of the model are examined over a range of engine speeds and fuel-air equivalence ratios. The magnitude by which the initial temperature must be increased above the bulk temperature decreases with increasing engine speed. This magnitude follows a trend which can be related to a heat transfer correlation. The magnitude of the temperature correction shows no dependence on equivalence ratio for propane; for methane and ethane, the temperature correction decreases with increasing equivalence ratio.


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    Title :

    Predictions of Autoignition in a Spark-Ignition Engine Using Chemical Kinetics


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1986



    Publication date :

    1986-03-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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