It has long been known that slender bodies can produce asymmetric vortices at high angles of attack, even with no sideslip . An asymmetric vortex could induce a time-averaged side force that is sometimes even larger than the normal force. The motivation for extensive studies in this subject mainly comes from the demand for enhanced maneuverability of modern aircraft and tactical missiles. However, the intrinsic fascination for the unique flow itself, in which axisymmetric bodies could produce asymmetric flow patterns, has also greatly motivated research interest. A wind-tunnel experiment was conducted to study the effects of forced asymmetric transition on the asymmetric vortex system of a slender body by adding a grit strip on either side of the body. The results showed that the effect is very different depending on whether transition of the boundary layer occurs first on the higher vortex side or on the lower vortex side. If the transition first occurs on the higher vortex side, the transition will strongly influence the asymmetric vortex behavior and the side forces induced. The asymmetric vortex system will abruptly reverse its orientation when transition occurs and then gradually recover to its original position with increasing Reynolds number. However, if the transition first occurs on the lower vortex side, the trend of the asymmetric vortex system with increasing Reynolds number will be very similar to the case of natural transition. In addition, the asymmetric transition of the boundary layers on the forebody seems to have a dominant effect on the behavior of the asymmetric vortex system. The associated separation angles of the boundary layers appear to play a pronounced role in the development of the asymmetric vortex system.


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    Title :

    Effects of forced asymmetric transition on vortex asymmetry around slender bodies


    Additional title:

    Einfluss eines erzwungenen asymmetrischen Übergangs auf die Wirbel-Asymmetrie um schmale Körper


    Contributors:
    Ma, Bao-Feng (author) / Deng, Xue-Ying (author) / Chen, Ying (author)

    Published in:

    AIAA Journal (online) ; 45 , 11 ; 2671-2676


    Publication date :

    2007


    Size :

    6 Seiten, 9 Bilder, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English