The perforated test section walls of a transonic wind tunnel are responsible for generating edgetones, thus contributing significantly to the overall noise level and possibly invalidating the measurements of surface pressure fluctuations. In the present study, the wind tunnel was assembled with perforated top/bottom walls, solid side walls, and four perforated walls. The focus was to investigate the effects of tunnel background noise on compressible convex-corner flows, which correspond to the upper control surface of an aircraft wing. External acoustic disturbance has a minor effect on the mean surface pressure distributions, including flow expansion and recompression near the corner. Higher peak pressure fluctuations, which are associated with shock excursion phenomena, are observed with more intense tunnel background noise, particularly for the flow with initial separated boundary layers.


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    Title :

    Tunnel Background Noise on Compressible Convex-Corner Flows


    Contributors:

    Published in:

    Journal of Aircraft ; 50 , 4 ; 1011-1015


    Publication date :

    2013-06-06


    Size :

    5 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Flow Similarity in Compressible Convex-Corner Flows

    Chung, Kung-Ming / Chang, Po-Hsiung / Chang, Keh-Chin | AIAA | 2012