A new technique of translating linear to rotary motion, using the Stiller- Smith mechanism, can be applied to the design of internal combustion engines and compressors. This new mechanism produces purely sinusoidal motion of the pistons relative to crank angle, which is a different motion from that produced by a conventional slider-crank mechanism, Influence of this sinusoidal motion on thermodynamic performance of engines and compressors was investigated theoretically and experimentally. Data are presented from a numerical analysis of compression and of spark-ignited combustion. Also, pressure-time curves for a standard and a modified (long connecting rod) spark ignition engine are compared. All data confirm that there is little thermodynamic difference between the Stiller-Smith and slider-crank devices.


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    Title :

    The Influence of Sinusoidal Piston Motion on the Thermal Efficiency of Engines


    Additional title:

    Sae Technical Papers



    Conference:

    Passenger Car Meeting & Exposition ; 1987



    Publication date :

    1987-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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