An analysis has previously established that local shock surfaces attached to helicopter rotor blades moving at high subsonic speeds are potent noise generators; in pursuit of this insight, a novel formulation is presented for the prediction of the noise of a deformable shock, whose area changes as a function of the azimuthal position of the blade. The derivation of this formulation has its basis in a mapping of the moving shock to a time-independent region. In virtue of this mapping, the implementation of the main result on a computer becomes straightforward enough for incorporation into the available rotor-noise prediction code. A problem illustrating the importance of rotor shocks in the generation of high-intensity noise is presented.


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    Titel :

    Can shock waves on helicopter rotors generate noise? - A study of the quadrupole source


    Beteiligte:
    Farassat, F. (Autor:in) / Tadghighi, H. (Autor:in)

    Kongress:

    AHS, Annual Forum ; 1990 ; Washington, DC, United States


    Erscheinungsdatum :

    01.01.1990


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :



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    High-speed noise of helicopter rotors

    Shenoy, K. R. | NTRS | 1982


    Design of helicopter rotors to noise constraints

    Schaeffer, E. G. / Sternfeld, H., Jr. | NTRS | 1978