The use of synthetic (zero net mass flux) jets for the propulsion of fixed-wing small unmanned air vehicles was investigated. The formation of a time-averaged jet resulting from periodic excitation of a cavity and its interaction with separated flow over the airfoil were studied. As a thick trailing edge does not have an adverse effect on lift generation at low Reynolds numbers, a synthetic jet was placed at the trailing edge of the airfoil. It was shown that when the synthetic jet is activated the separated shear layer reattaches near the trailing edge of a cambered airfoil for momentum coefficients larger than a critical value, resulting in enhanced lift. For momentum coefficients larger than a critical value, the jet produces positive thrust, which strongly depends on excitation frequency. An optimum frequency range was identified, which produces maximum thrust. Aerodynamic efficiency was investigated as a function of the main parameters.


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    Titel :

    Interaction of synthetic jet propulsion with airfoil aerodynamics at low Reynolds numbers


    Weitere Titelangaben:

    Wechselwirkung des pulsierenden Strahlantriebs eines unbemannten Flugzeugs mit der Aerodynamik seiner Tragflächen bei niedrigen Reynolds-Zahlen


    Beteiligte:
    Whitehead, James (Autor:in) / Gurusul, Ismet (Autor:in)

    Erschienen in:

    AIAA Journal (online) ; 44 , 8 ; 1753-1766


    Erscheinungsdatum :

    2006


    Format / Umfang :

    14 Seiten, 21 Bilder, 34 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch







    TERACTION OF SYNTHETIC JET PROPULSION WITH WING AERODYNAMICS AT LOW REYNOLDS NUMBERS

    Whitehead, J. A. / Gursul, I. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2004


    Compressibility Effects on Airfoil Aerodynamics at Low Reynolds Numbers

    Suwa, T. / Nose, K. / Numata, D. et al. | British Library Conference Proceedings | 2012