Within a parametric study on brush-type trailing-edge extensions, the noise reduction potential of several design concepts was determined. The obtained database represents the first phase of an ongoing project with the long-term objective to develop scaling laws for a future application of such devices as add-on solutions for today's aircraft components. The experiments comprised both acoustic and aerodynamic measurements on a zero-lift generic plate model (Re = 2.1 x 106 to 7.9 x 106) in DLR's open jet Aeroacoustic Wind Tunnel Braunschweig. Noise data were taken by means of a directional microphone system. Measurement results indicate a significant source noise reduction potential in excess of 10 dB, depending on the configuration. Two relevant noise reduction mechanisms were identified: 1) the suppression of narrowband bluntness noise, as well as 2) the reduction of broadband turbulent boundary-layer trailing-edge noise.


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    Titel :

    Experimental investigations in low-noise trailing-edge design


    Weitere Titelangaben:

    Experimentelle Untersuchung einer Schalldämpfungsvorrichtung an der Hinterkante von Tragflächen


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 43 , 6 ; 1167-1175


    Erscheinungsdatum :

    2005


    Format / Umfang :

    9 Seiten, 16 Bilder, 4 Tabellen, 20 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Experimental Investigations in Low Noise Trailing Edge Design

    Herr, Michaela / Dobrzynski, Werner | AIAA | 2004


    Experimental Investigations in Low-Noise Trailing Edge Design.

    Michaela Herr / Werner Dobrzynski | AIAA | 2005



    Trailing edge noise

    TAM, C. / YU, J. | AIAA | 1975


    Experimental Investigation Into Trailing Edge Noise Sources

    Garcia-Sagrado, Ana / Hynes, Tom / Hodson, Howard | AIAA | 2006