Detailed analysis has been made of the ingestion and dispersion of engine exhaust products into the trailing-vortex system of a supersonic aircraft flying in the stratosphere. The rate of mixing between the supersonic jet and the coflowing supersonic stream was found to be an order of magnitude less than would be expected on the basis of subsonic eddy-viscosity results. Ingestion started at the end of the potential core, and all hot gas from the engine was ingested into the trailing vortex within two core lengths. The temperature rise in the wake of the supersonic aircraft was found to be much greater than that for a subsonic transport, since temperature rise varies directly as speed squared and inversely as aspect ratio. As a result, the final buoyancy phase started only ten seconds after leaving the trailing edge. Comparison between the buoyancy calculations for the supersonic case with nondimensionalized subsonic aircraft contrail data on wake spreading showed good agreement.


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    Title :

    Ingestion and dispersion of engine exhaust products by trailing vortices for supersonic flight in the stratosphere


    Contributors:

    Conference:

    Aerospace Sciences Meeting ; 1974 ; Washington, DC


    Publication date :

    1974-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :






    On the Streamwise Vortices in Trailing Edge Modified Supersonic Jets

    Kim, J.-H. / Samimy, M. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1999