The paper describes the basic design concept of a heat barrier piston comprising a Nimonic crown separated from the aluminium piston body by an air gap. Heat flow, temperature and stress levels have been evaluated using a series of specially developed finite element programs.Preliminary experimental results obtained with the insulating piston on a Petter PH1 W engine indicate a very substantial rise in exhaust temperature, coupled with considerable reduction in volumetric efficiency under naturally aspirated conditions.In a final theoretical section, the effects of insulated pistons and of insulated cylinder walls in general are discussed both with respect to their effect on thermodynamic cycle parameters and to the possibility of substantial improvements in thermal efficiency using the compounding principle. Final guidelines are laid down for the most effective use of thermal insulation in compounded Diesel engines.


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    Titel :

    Thermal Barrier Pistons and Their Effect on the Performance of Compound Diesel Engine Cycles


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Cole, A. (Autor:in) / Wallace, F. J. (Autor:in) / Tarabad, M. (Autor:in) / Kao, T. K. (Autor:in) / Alexander, W. D. (Autor:in)

    Kongress:

    SAE International Congress and Exposition ; 1983



    Erscheinungsdatum :

    01.02.1983




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Thermal barrier pistons and their effect on the performance of compound Diesel engine cycles

    Wallace,F.J. / Kao,T.K. / Alexander,W.D. et al. | Kraftfahrwesen


    Thermal effects on diesel engine pistons

    Roehrle,M.D. / Mahle | Kraftfahrwesen | 1978


    Thermal Effects on Diesel Engine Pistons

    Roehrle, Manfred D. | SAE Technical Papers | 1978



    Diesel pistons

    Engineering Index Backfile | 1949