Unsteady Reynolds-averaged Navier-Stokes simulations of the low-Reynolds-number flow past an SD7003 airfoil with combined plunge and pitch motion at Re = 60,000 are presented in which transition takes place across laminar separation bubbles. The numerical simulation approach includes transition prediction that is based on linear stability analysis applied to unsteady mean flow data. A parameter study for three reduced frequencies of k = 0.25, 0.5, and 1.0 is conducted. The drag losses encountered are quantified by a comparison with results using inviscid unsteady airfoil theory. High propulsive efficiencies are gained within the investigated thrust range, which goes to about 10 times the steady onflow airfoil drag.


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    Title :

    Propulsive efficiency of a moving airfoil at transitional low Reynolds numbers


    Additional title:

    Antriebseffizienz eines beweglichen Tragflügels bei übergangsweise niedrigen Reynolds-Zahlen


    Contributors:

    Published in:

    AIAA Journal ; 46 , 9 ; 2165-2177


    Publication date :

    2008


    Size :

    13 Seiten, 26 Bilder, 46 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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