This paper describes a new method for computing the flowfield and acoustic signature of arbitrary rotor in forward flight. The overall scheme solves the Navier-Stokes equations on a system of overset grids. These grids allow for prescribed cyclic and flapping blade motions and capture the interactions between the rotor blades and wake. The far-field noise is computed with an acoustic integral over a surface that completely encloses the rotor blades. Interpolations onto this acoustic surface use the same overset-grid techniques that are used for the flowfield solution. As a demonstration of the overall prediction scheme, computed and experimental far-field noise results are compared in cases with high-speed impulsive (HSI) and blade-vortex interaction (BVI) noise. Computed HSI noise shows excellent agreement with experimental data in the plane of the rotor. Out-of-plane HSI and BVI predictions require improved grid resolution in the rotor wake to capture the details of the high-frequency loading noise.


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    Title :

    Rotorcraft aeroacoustics computations with overset-grid CFD methods


    Additional title:

    Aeroakustische Rotorberechnungen mit 'Overset-Netz'-CFD-Methoden


    Contributors:
    Strawn, R.C. (author) / Duque, E.P.N. (author) / Ahmad, J. (author)

    Published in:

    Publication date :

    1999


    Size :

    9 Seiten, 8 Bilder, 3 Tabellen, 20 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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