Gas turbine engines in tanks and helicopters should be capable of at least emergency service with any fuel. Long term operation of the same vehicles, as well as aircraft, will involve alternative fuels from non-petroleum sources. Non-aviation specification fuels however affect angine performance and in particular combustion efficiency. A characteristic time model correlation is examined with fuels representative of future alternatives with emphasis on viscosity and volatility effects upon efficiency. Results from heavier fuels as examined on a disc stabilized research combustor are compared with those from present day aviation fuels. A ratio of a chemical kinetic time to a turbulent mixing time in the shear layer surrounding the flame stabilizing recirculation zone correlates data for mixing controlled flames and a new characteristic time relevant to the fuel injection process is introduced which collapses geometry effects well for a given fuel but which fails to correlate individual fuel effects completely. Progress made to date with inclusion of heterogeneous effects in characteristic time correlations is detailed, and further requisite research is suggested. (Kursetz)


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    Title :

    A characteristic time correlation for combustion inefficiency from alternative fuels


    Additional title:

    Ein charakteristischer Zeitvergleich fuer die Minderung des Verbrennungswirkungsgrades bei der Anwendung von Alternativtreibstoffen fuer Gasturbinen


    Contributors:

    Published in:

    AIAA-Papers ; Jan ; 1-10


    Publication date :

    1979


    Size :

    10 Seiten, 10 Bilder, 2 Tabellen, 24 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






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