Experimental and theoretical studies are made of the spectra of noise and blade loading caused by interference of a propeller, helicopter rotor and fan rotor with inlet turbulence. Tests were made with hot-wire anemometers in a static inlet and pressure transducers on the blades of a fan rotor. It is found that the noise is partially coherent, with very narrow spectrum peaks. Spectrum peaks are explained by the narrow-band random mechanism of inflow turbulence and not as harmonic noise due to fixed inflow distortion.


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    Title :

    Spectrum of rotor noise caused by atmospheric turbulence


    Additional title:

    Spektrum des durch atmosphaerische Turbulenz verursachten Drehfluegellaerms


    Contributors:

    Published in:

    Publication date :

    1974


    Size :

    , 24 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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