Wing control surfaces are used to trigger the breakup of trailing vortices behind aircraft in a flaps-down configuration. In the near field of the aircraft there are multiple pairs of vortices, which admit new instability mechanisms that do not exist on a single pair of vortices. A periodic motion of the control surfaces is used to introduce a unique form of perturbation that is amplified in the multiple vortex-pair system but conserves total circulation, lift, and rolling moment. Growth of the perturbations leads to the periodic pinching of the starboard and port vortices into a series of vortex rings. The concept is demonstrated using numerical simulations and towing-tank experiments. Results show that the system breaks up the trailing vortices more rapidly than a comparable excitation of the Crow instability on a single pair of vortices. The overall effectiveness of the system depends on the airplane configuration, namely, details of the flap system and the horizontal tail.


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    Title :

    Active-control system for breakup of airplane trailing vortices


    Additional title:

    Zerstörung der Wirbelschleppe im Nachstrom eines Flugzeugs durch periodische Bewegung der Landeklappe


    Contributors:
    Crouch, J.D. (author) / Miller, G.D. (author) / Spalart, P.R. (author)

    Published in:

    AIAA Journal ; 39 , 12 ; 2374-2381


    Publication date :

    2001


    Size :

    8 Seiten, 9 Bilder, 14 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Active-Control System for Breakup of Airplane Trailing Vortices

    J. D. Crouch / G. D. Miller / P. R. Spalart | AIAA | 2001





    Flight-simulator study of airplane encounters with perturbed trailing vortices

    Loucel, R. E. / Crouch, J. D. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2004