The application of leading-edge separation control on an uninhabited air vehicle (UAV) with 50-deg leading-edge sweep is investigated experimentally in a full-scale close-return wind tunnel using arrays of synthetic jet actuators. Active flow control is used to enhance vehicle control at moderate and high angles of attack for takeoff and landing activities or gust load alleviation. The surface-mounted synthetic jet actuators are operated in various waveforms where the carrier frequency is at least an order of magnitude higher than the characteristic shedding frequency of the UAV. Actuation yields a suction peak near the leading edge, however, while excitation with a sinusoidal waveform results in a sharp suction peak near the leading edge; pulse modulation yields a larger and wider suction peak. The flow transients associated with controlled reattachment and separation of the flow over the UAV are investigated using amplitude modulation of the actuation waveform by measuring the dynamic surface pressure at different locations on the upper surface of the UAV 's wing. Phase-locked measurements show that the transients, associated with the onset of reattachment and separation, at high angles of attack are accompanied by the shedding of large-scale vortical structures and oscillations of the surface pressure. However, no oscillations are observed when the baseline flow is attached.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Active flow control on the stingray uninhabited air vehicle: Transient behavior


    Weitere Titelangaben:

    Aktive Regelung der Tragflügelumströmung bei einer Drohne: Transientes Verhalten


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 42 , 11 ; 2205-2215


    Erscheinungsdatum :

    2004


    Format / Umfang :

    11 Seiten, 16 Bilder, 25 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Active Flow Control on the Stingray Uninhabited Air Vehicle: Transient Behaviour

    Michael Amitay / Anthony Washburn / Scott Anders et al. | AIAA | 2004



    Active Flow Control on the STINGRAY UAV: Transient Behavior

    Amitay, Michael / Washburn, Anthony / Anders, Scott et al. | AIAA | 2003



    Active Flow Control on the STINGRAY UAV: Physical Mechanisms

    Washburn, Anthony / Amitay, Michael | AIAA | 2004