This paper presents the results of an experimental investigation of the flow-induced sound produced by a smooth, wall-mounted finite length airfoil with a flat-ended tip and a tripped turbulent boundary layer. Acoustic measurements have been taken in the Stability Wind Tunnel at Virginia Polytechnic Institute and State University with a microphone array at a range of Reynolds numbers (ReC=7.9×105−1.6×106, based on chord), angles of attack (α=0–12  deg), and for a variety of airfoil aspect ratios (airfoil length-to-chord ratio of ). Spectral data show the dominant noise sources are airfoil trailing-edge noise and tip-vortex-formation noise. Acoustic data are also used to evaluate semi-empirical prediction of wall-mounted finite airfoil trailing edge and tip noise with the so-called Brooks, Pope, and Marcolini model. The prediction method employs the Brooks, Pope, and Marcolini trailing-edge-noise model modified to incorporate spanwise variations in flow properties in combination with the Brooks, Pope, and Marcolini flat-tip-noise model. Three-dimensional trailing-edge-noise predictions agree well with measured spectra at a Strouhal number of SrC<18, based on airfoil chord. The Brooks, Pope, and Marcolini tip-noise model underpredicts the peak level and frequency of tip-noise contributions at SrC>18. A new empirical model of flat-tip-airfoil noise is presented that provides an accurate estimation of the wall-mounted finite airfoil dominant tip-noise contribution to within 1.7 dB.


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    Title :

    Wall-Mounted Finite Airfoil-Noise Production and Prediction



    Published in:

    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    50.93 / 55.50 Luftfahrzeugtechnik / 50.93 Weltraumforschung / 55.60 Raumfahrttechnik / 55.50 / 55.60
    Local classification TIB:    770/7040



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