The thrust and/or propulsive efficiency of a single flapping airfoil is maximized by using a numerical optimization method based on the steepest ascent. The flapping motion of the airfoil is described by a combined sinusoidal plunge and pitching motion. Optimization parameters an taken to be the amplitudes or the plunge and pitching motions and the phase shift between them at a fixed flapping frequency. Two-dimensional, unsteady, low-speed, laminar, and turbulent flows an computed by using a Navier-Stokes solver on moving overset grids. Computations an performed in parallel in a computer cluster. The optimization data show that high thrust values may be obtained at the expense of propulsive efficiency. For a high propulsive efficiency, the effective angle of attack of the airfoil is reduced, and large-scale vortex formations at the leading edge an prevented.


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    Titel :

    Optimization of flapping airfoils for maximum thrust and propulsive efficiency


    Weitere Titelangaben:

    Optimierung des Flügelschlags eines Mikroflugzeugs bezüglich Schub und Wirkungsgrad


    Beteiligte:
    Tuncer, Ismail H. (Autor:in) / Kaya, Mustafa (Autor:in)

    Erschienen in:

    AIAA Journal ; 43 , 11 ; 2329-2336


    Erscheinungsdatum :

    2005


    Format / Umfang :

    8 Seiten, 15 Bilder, 2 Tabellen, 20 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch