Heat flux measurement and pressure-based heat release analysis have been performed on a spray-guided direct-injection spark-ignition single-cylinder research engine. A two-dimensional model of the heat flux sensor has been used to calculate the heat flux from the measured surface temperature. The effects of the ignition timing, air-fuel ratio, and mixture preparation on the engine heat flux and heat release have been investigated at a specific operating condition. An engine thermodynamic simulation code has been used to predict the gas-to-wall heat transfer using different heat transfer correlations. It was found that both the heat release rate and the heat flux are strongly influenced by ignition timing and air-fuel ratio. The results also show that late direct injection has a faster initial burn rate even compared with the plenum injection mode. The modelled heat transfer has been compared with the measured results and a modified Woschni correlation has been proposed.


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    Title :

    Heat release and heat flux in a spray-guided direct-injection gasoline engine


    Contributors:
    Wang, X (author) / Price, P (author) / Stone, C R (author) / Richardson, D (author)


    Publication date :

    2007-11-01


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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