Previous SPS vehicular steam expander development is reviewed. A counterflow expander installed in the 3000 lb (1364 kg) California Steam Car is shown to give 6.2 mpg (2.2 km/l) over the Urban Federal Driving Cycle, for BSFC = 1.2. Advantages of the uniflow expander with impulse valves are discussed, and the equation for theoretical cycle efficiency is derived. Laboratory tests on a 4 cylinder uniflow with impulse valves and a 2000 psia (136 atm), 1400° F (760° C) monotube boiler are described, and efficiency results for steam temperatures up to 1100° F (593° C) are presented. The measured brake thermal efficiency of the test uniflow increases with expansion ratio E from .146 to .225 for 5.7〈 E 〈 14.0. The counterflow efficiency decreases with E, from .18 to .11 for 7 〈 E 〈 15. Internal losses are discussed, and the higher efficiency of the uniflow is justified on the basis of lower internal leakage, heat transfer and friction.


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    Titel :

    Recent Advances in Vehicular Steam Engine Efficiency


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    1976 Automotive Engineering Congress and Exposition ; 1976



    Erscheinungsdatum :

    01.02.1976




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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