Some exploratory tests were recently performed in the transonic test section of the NASA Marshall Space Flight Center 14-in. wind tunnel to suppress the background noise. In these tests, the perforated walls of the test section were covered with fine wire screens. The screens eliminated the edge tones generated by the holes in the perforated walls and significantly reduced the tunnel background noise. The tunnel noise levels were reduced to such a degree by this simple modification at Mach numbers 0.75, 0.9, 1.1, 1.2, and 1.46 that the fluctuating pressure levels of a turbulent boundary layer could be measured on a 5-deg half-angle cone.


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    Title :

    Suppression of background noise in a transonic wind-tunnel test section


    Contributors:

    Published in:

    Publication date :

    1975-11-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Suppression of background noise in a transonic wind-tunnel test section

    SCHUTZENHOFER, L. A. / HOWARD, P. W. | AIAA | 1975




    NACA transonic wind tunnel test sections

    Wright, Ray H. ;Ward, Vernon G. | SLUB | 1956


    NACA transonic wind-tunnel test sections

    Wright, Ray H. / Ward, Vernon G. | TIBKAT | 1955