Rotor wake vortex interaction causes flow separation on the upper surface of a lifting surface at low angles of attack, where the time-averaged flow would be expected to remain fully attached. This phenomenon is studied using a full-scale UH-1 stabilator and a two bladed teetering rotor in a wind tunnel. Several surprising phenomena have emerged. Current prediction methods for tilt-rotor aircraft interactional aerodynamics are likely to miss such phenomena, especially if the rotor wake is time-averaged before interaction. If a time-resolved wake were used, periodic separation and reattachment would be expected, as opposed to the unsteady three-dimensional separation with time-averaged spanwise flow which emerges. The separation is a possible contributor to the observed download on the wing, and a driver of large vibratory airloads on the wings as well as on control surfaces of all rotorcraft. The wing pressure distributions and periodic variations are much more complex than expected. Large excursions of separation points are to be ecpected, forcing vibrations. Another surprise is that no actual collisions of the vortex with the surface are seen, nor are the large pressure spikes typical of such collisions.


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    Titel :

    Rotor-wake-induced flow separation on a lifting surface


    Weitere Titelangaben:

    Durch die Rotorblatt-Nachlaufzone induzierte Strömungstrennung auf einer Tragfläche bei Auftriebsbedingungen


    Beteiligte:
    Foley, S.M. (Autor:in) / Funk, R.B. (Autor:in) / Fawcett, P.A. (Autor:in) / Komerath, N.M. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1995


    Format / Umfang :

    4 Seiten, 6 Bilder, 5 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch






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    Wenren, Yonghu / Steinhoff, John | AIAA | 2009



    Rotor Wake Computing With Lifting Lines and Vorticity Confinement

    Wenren, Y. / Steinhoff, J. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2009