This paper presents an aeroacoustic compact-source formulation for predicting tonal noise generated aerodynamically by rotors that is applicable to hydroacoustic problems as well. Based on the knowledge of blade sectional loads, it is suitable for reducing the amount of aerodynamic data required (particularly relevant, for instance, in maneuvering motion) and is applicable also when detailed blade pressure is not available. The Küssner–Schwarz airfoil aerodynamics theory is applied to derive the chordwise pressure jump equivalent to the sectional loads provided (either by measurements or computational tools). A zeroth-order boundary element method is applied for spanwise integration of the resulting compact-source, spectral-integral formulation. Numerical investigations concern a helicopter main rotor in descent flight and a marine propeller in nonuniform inflow. They demonstrate that, increasing the number of spectral coefficients (and corresponding sectional loads), this compact-source formulation converges toward solutions providing accurate noise predictions, even for rotors with irregular blade pressure distributions.


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    Title :

    Spectral-Boundary-Integral Compact-Source Formulation for Aero-Hydroacoustics of Rotors


    Contributors:
    Bernardini, G. (author) / Gennaretti, M. (author) / Testa, C. (author)

    Published in:

    AIAA Journal ; 54 , 11 ; 3349-3360


    Publication date :

    2016-06-30


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English








    Aero-acoustics of helicopter rotors

    Prieur, J. / Von Karman Institute for Fluid Dynamics | British Library Conference Proceedings | 1996