An experimental method to study helicopter blade-vortex interaction (BVI) noise has been developed. Called the blade-controlled disturbance interaction, the method nearly replicates a rotor BVI by having a single-bladed rotor pass through a stationary gust field specially designed to simulate the highly impulsive induced velocity field of a vortex. This approach can be used to evaluate the effectiveness of blade design changes to noise radiation during a BVI event, as well as to study the effect of different interaction geometries on the resulting noise. The first set of experiments in this facility shows that the directionality of BVI noise radiation is very sensitive to the interaction angle. Oblique interactions spread the acoustics energy over wider azimuth angles compared to parallel interactions, as well as move the peak noise location closer to the rotor plane. Linear two-dimensional unsteady aerodynamic theory predicts the overall directionality trends reasonably well. However, the actual pulse shapes do not match and noise levels are underpredicted, particularly for oblique interactions.


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    Title :

    An experimental and theoretical study of blade-vortex interaction noise


    Additional title:

    Eine experimentelle und theoretische Studie zum Rotorblatt/Wirbel-Wechselwirkungslärm


    Contributors:

    Published in:

    Journal of the American Helicopter Society ; 58 , 3 ; 032006/1-032006/11


    Publication date :

    2013


    Size :

    11 Seiten, 19 Bilder, 1 Tabelle, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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