Experimental studies of supersonic impinging jet flows suggest that they are greatly influenced by the flow-acoustic interactions through a feedback mechanism. The self-sustained oscillations of the jet column observed in these flows result in high velocities in the ambient medium induced by the large-scale coherent vortical structures in the jet shear layers. As a consequence, the suck down force on the surface from which the jet is issuing can reach as high as 60% of the primary jet thrust. In addition, the overall sound pressure levels (OASPL) increase significantly relative to a free jet. To alleviate these undesirable flow and acoustic characteristics, a novel control technique using supersonic microjets is demonstrated. Sixteen supersonic microjets are placed around the circumference of the main jet at the nozzle exit to disrupt the feedback mechanism. As a result, significant lift loss recovery (approximately 50%) and reduced near field OASPL (approximately 7 dB) are observed.


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    Title :

    Active Control of Supersonic Impinging Jets


    Contributors:
    Krothapalli, A. (author) / Elavarasan, R. (author) / Alvi, F. (author) / Shih, C. (author) / Wardwell, Doug (author)


    Publication date :

    2001-06-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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