Unsteady flows produced by a periodically deforming airfoil leading edge (PDLE) was examined in detail. This configuration allows for reduced form drag while producing vortex structures which promote flow re-attachment past static stall angles. Flow visualization was used to show the flow structures that formed due to PDLE deployment and hot-wire anemometry allowed the associated vorticity production to be evaluated throughout the cycle. The present studies provide evidence for optimal vortex production rates. Within the range of test conditions used, a reduced frequency of 2.0 yielded flow field re-attachment that was more complete than produced by reduced frequencies of 1.0 and 2.5. The hypothetical underlying mechanisms supporting these phenomena are discussed.


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    Title :

    Unsteady separated flows driven by periodic leading edge deformation


    Additional title:

    Durch periodische Verformung der Leitkante erzeugte instationaere Stroemungsabrisse


    Contributors:
    Huyer, S.A. (author) / Luttges, M.W. (author)

    Published in:

    AIAA-Papers ; Jul ; 1-14


    Publication date :

    1987


    Size :

    14 Seiten, 10 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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