A highly noise suppressed TF 34 engine was used to investigate the noise of several powered lift configurations involving upper-surface-blown (USB) flaps. The configuration variables were nozzle type (i.e. slot and circular with deflector), flap chord length, and flap angle. The results of velocity surveys at both the nozzle exit and the flap trailing edge are also presented and used for correlation of the noise data. Configurations using a long flap design were 4 dB quieter than a short flap typical of current trends in USB flap design. The lower noise for the long flap is attributed primarily to the greater velocity decay of the jet at the flap trailing edge. The full-scale data revealed substantially more quadrupole (V8) noise in the region near the deflected jet than observed in previous sub-scale tests.


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    Title :

    FULL-SCALE UPPER-SURFACE-BLOWN FLAP NOISE


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    National Air Transportation Meeting ; 1975



    Publication date :

    1975-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






    Externally-blown-flap noise

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


    Blown flap noise research

    DORSCH, R. / KREJSA, E. / OLSEN, W. | AIAA | 1971


    Externally-blown-flap noise

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