Noise generated in aircraft engines is usually suppressed by acoustically treating the engine ducts. The optimization of this treatment requires an understanding of the transmission and attenuation of the acoustic waves. A critical review is presented of the state of the art regarding methods of determining the transmission and attenuation parameters and the effect on these parameters of (1) acoustic properties of liners, (2) the mean velocity, including uniform and shear profiles and nonparallel flow, (3) axial and transverse temperature gradients, (4) slowly and abruptly varying cross sections, and (5) finite-amplitude waves and nonlinear duct liners.


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    Title :

    The acoustics of aircraft engine-duct systems


    Contributors:

    Conference:

    Aeronautical Meeting ; 1973 ; Montreal, Canada


    Publication date :

    1973-10-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Acoustics of Aircraft Engine-Duct Systems

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    The acoustics of aircraft engine-duct systems

    NAYFEH, A. / KAISER, J. / TELIONIS, D. | AIAA | 1973


    Duct Acoustics: Panel Discussion: Duct Acoustics

    Nagamatsu, Henry T. | AIAA | 1976