The effect of tip-shape modification on blade-vortex interaction-induced helicopter blade-slap noise was investigated. The general rotor model system (GRMS) with a 3.148 m (10.33 ft) diameter, four-bladed fully articulated rotor was installed in the Langley V/STOL wind tunnel. The tunnel was operated in the open-throat configuration with treatment to improve the semi-anechoic characteristics of the test chamber. Based on previous investigation, four promising tips (ogee, sub-wing, 60 deg swept-tapered, and end-plate) were used along with a standard square tip as a baseline configuration. Aerodynamic and acoustical data concerning the relative applicability of the various tip configurations for blade-slap noise reduction are presented without analysis or discussion.


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    Title :

    An Experimental Investigation of the Effect of Rotor Tip Shape on Helicopter Blade-Slap Noise


    Contributors:
    D. R. Hoad (author)

    Publication date :

    1979


    Size :

    464 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English