The turbulent boundary layer (TBL) that forms on the outer skin of the aircraft in flight is a significant source of interior noise. However, the existing quiet test facilities capable of measuring the TBL wall pressure fluctuations tend to be at low Mach numbers. The objective of this study was to develop a new inlet for an existing six inch square (or 6×6) flow duct that would be adequately free from facility noise to study the TBL wall pressure fluctuations at higher, subsonic Mach numbers. First, the existing flow duct setup was used to measure the TBL wall pressure fluctuations. Then the modified inlet was successfully used to make similar measurements up to Mach number of 0.6. These measurements will be used in the future to validate wall pressure spectrum models for interior noise analysis programs such as statistical energy analysis (SEA) and dynamic energy analysis (DEA).


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    Title :

    Design of a Quiet Inlet for a 6×6 Boundary Layer Flow Duct


    Additional title:

    Sae Technical Papers


    Contributors:
    Holup, G. (author) / Gallman, J.M. (author) / Moeller, M.J. (author) / Lee, S.W. (author) / Miller, T.S. (author)

    Conference:

    SAE 2011 Noise and Vibration Conference and Exhibition ; 2011



    Publication date :

    2011-05-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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