Volumetric measurements of the flow within four cavities were made by scanning stereoscopic particle image velocimetry at a freestream Mach number of 0.8. The cavities have a length-to-depth ratio L / D = 7 , and a width-to-length ratio b / L = 0.5 . Three complex cavity geometries are used to model features representative of real aircraft bays and compare them to a simple rectangular cavity. The rectangular configuration exhibits signs of a transitional cavity regime, with resonant tones that compare well with predicted Rossiter values. The addition of a leading-edge ramp lofts the cavity mixing layer and accelerates the cavity freestream, resulting in reduced Rossiter amplitudes and increased frequencies. Side-wall spillage vortices are present in the rectangular cavity but are not found after the addition of side ramps that lessen the pressure gradient forming them. A center scoop causes a spanwise variation of velocity characteristics within the flowfield. Finally, a jagged leading edge attached to the scooped case results in reduced velocity fluctuations with an increased Rossiter mode-2 amplitude.


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    Title :

    Volumetric Velocimetry of Complex Geometry Effects on Transonic Flow over Cavities



    Published in:

    AIAA Journal ; 57 , 5 ; 1941-1954


    Publication date :

    2019-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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    Transonic flow over cavities

    Martel, John / Anderson, Chris / Sforza, Pasquale | AIAA | 2001