Research on extended expansion engine was carried out in order to enhance thermal efficiency in general purpose engines. A four-jointed linkage was used between the connecting rod and the crank pin of a standard piston-crank system and provides an Atkinson thermo dynamic cycle.Thermal efficiency of an engine with a compression ratio of 12.4 and an expansion ratio of 18.1 was compared to an engine with a compression ratio of 9.4 and an expansion ratio of 13.6.Measured indicated thermal efficiency of prototyped engine operated by natural gas was 38.7%, a 2.6% increase, as predicted in the numerical simulation.


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    Title :

    Research on Extended Expansion General-Purpose Engine-Efficiency Enhancement by Natural Gas Operation-


    Additional title:

    Sae Technical Papers


    Contributors:
    Koga, Hibiki (author) / Watanabe, Sei (author) / Kono, Shohei (author)

    Conference:

    Small Engine Technology Conference & Exposition ; 2010



    Publication date :

    2010-09-28




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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