The present analysis of the 3D characteristics of the mixing processes in a scramjet combustor gives attention to the streamwise, vorticity-driven macromixing, as well as shear-driven small-scale mixing, in both an unconfined Mach 6 airstream and a high-enthalpy (Mach-17) confined, Mach 6 airstream. The results obtained indicate that mixing is substantially lower for the high-enthalpy case. The effect of residence time on jet mixing is discussed in view of the production and decay of the axial vorticity, cross-flow velocities, and mean-flow velocities of these confined flows. The effective distance travelled by a fluid particle in the cross-flow, over the combustor length, is used to explain axial vorticity's contribution to mixing.


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    Title :

    Flow enthalpy effects on scramjet mixing and combustion


    Contributors:

    Conference:

    AIAA, International Aerospace Planes Conference ; 1992 ; Orlando, FL, United States


    Publication date :

    1992-12-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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