A viscous-inviscid interaction model has been developed which accounts for jet entrainment effects in the prediction of the subsonic flow over nozzle afterbodies. The jet entrainment model is based on the concept of a weakly interacting shear layer in which the local streamline deflections due to entrainment are accounted for by a displacement-thickness type correction to the inviscid plume boundary. The entire flowfield is solved in an iterative manner to account for the effects on the inviscid external flow of the turbulent boundary layer, turbulent mixing and chemical reactions in the shear layer, and the inviscid jet exhaust flow. The individual components of the computational model are described and numerical results are presented which illustrate the interactive effects of entrainment on the overall flow structure. The validity of the interactive model is assessed by comparisons with data obtained from flowfield measurements on cold-air jet exhausts. Numerical results and experimental data are also given which show the entrainment effects on nozzle boattail drag under various jet exhaust and freestream flow conditions. (Kursetz)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    A numerical study of jet entrainment effects on the subsonic flow over nozzle afterbodies


    Additional title:

    Eine numerische Untersuchung der Auswirkung der Strahllenkung auf Unterschallgeschwindigkeits-Stroemungen ueber Duesenrueckteile


    Contributors:

    Published in:

    AIAA-Papers ; Jan ; 1-12


    Publication date :

    1979


    Size :

    12 Seiten, 18 Bilder, 2 Tabellen, 25 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English