An investigation of externally blown flap impingement noise was conducted using a full-scale turbofan engine and aircraft wing. The noise produced with a daisy nozzle installed on the engine exhaust system was greater than that produced by a conical nozzle at the same thrust. The daisy nozzle caused the jet velocity to decay about 35 percent at the flap. The presence of the wing next to the conical nozzle increased the noise, as did increasing the flap deflection. Compared with the conical nozzle, the daisy nozzle produced slightly less noise at a flap deflection of 60 deg but produced more noise at the lower flap deflections tested.


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    Title :

    Externally blown flap impingement noise.


    Contributors:

    Conference:

    American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference ; 1972 ; Boston, MA


    Publication date :

    1972-06-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Externally blown flap impingement noise

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    Externally-blown-flap noise

    DORSCH, R. / KREIM, W. / OLSEN, W. | AIAA | 1972


    Externally-Blown-Flap Noise

    R. G. Dorsch / W. J. Kreim / W. A. Olsen | NTIS | 1972


    Externally-blown-flap noise

    Dorsch, R. G. / Kreim, W. J. / Olsen, W. A. | NTRS | 1972