Noise measurements made on a helicopter rotor in a wind tunnel are described. The acoustic calibration measurements made with the wind-on and wind-off in an empty tunnel are described. The helicopter noise results are corrected for reverberation and amplification effects in the acoustically untreated test section by the simple application of some comparative control measurements of the noise from a basic source at the rotor location in the tunnel wind-off and free-field conditions outside. (Author)


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    Title :

    Noise Measurements in the Modane Large Wind-Tunnel


    Contributors:
    C. Broll (author)

    Publication date :

    1973


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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