Rotorcraft Impulsive (i.e. High-Speed Impulsive (HSI) and Blade-Vortex Interaction (BVI)) noise for advancing rotors is studied numerically. The unsteady transsonic Full-Potential Rotor (FPR or FPRBVI) code is used for the simulation of the near-field flow. A rotating Kirchhoff's method has been installed in the TRAC (TiltRotor Aeroacoustic Codes) system of NASA Langley and is used for the extension to the acoustic far-field. The results are compared to available experiments and results from the acoustic analogy code WOPWOP. Results for both HSI and BVI (including both independently-generated and self-generated vortices) are presented and compared with several experiments. The results show that the rotating Kirchoff noise method is becoming a very valuable tool for rotorcraft impulsive noise prediction and can complement codes based on the acoustic analogy method.


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    Title :

    An evaluation of a rotating Kirchhoff acoustic methodology


    Contributors:

    Published in:

    Publication date :

    1998


    Size :

    9 Seiten, 19 Bilder, 31 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English