Short takeoff and landing (STOL) aircraft using externally blown flaps (EBF) for lift augmentation develop considerable jet-flap interaction noise. A proposed method to reduce the EBF trailing edge noise is to locate a slot near the trailing edge of a flap through which low velocity secondary air is blown. Limited OASPL noise data were obtained from the interaction of the jet exhaust from a 5.08 cm diameter convergent nozzle with the trailing edge of a plate, and are presented for five slot configurations located near or at the trailing edge of the plate. Also presented are some significant jet trailing edge interaction data using a mixer nozzle with one of the slot configurations. (Author)


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    Title :

    Externally Blown Flap Trailing Edge Noise Reduction by Slot Blowing a Preliminary Study


    Contributors:

    Publication date :

    1973


    Size :

    16 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English








    Externally-blown-flap noise.

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