An experimental investigation on the aerodynamics of a propulsive jet in a forward flight condition has been presented. The study was performed in incompressible flow, and it involved immersing the jet in the vortex wake of a delta wing planform. The effects of varying vortex-wake strength and exit velocity on the downstream evolution of the jet were quantified via three-dimensional hot-wire anemometry surveys. In addition, interpretation of the experimental results was aided by an analytical model based on the interaction of discrete vortices. It is shown that when vortices shed from airframe components pass by the vicinity of the jet (such as those from flaps, ailerons, strakes for fuselage junction, etc., during takeoff, landing and violent maneuvers of a flight vehicle) the jet could have a behavior quite different form that of an isolated coflowing jet. A salinent feature of the jet, as a consequence of being immersed in the induced velocity field of the vortex wake of airframe vortices, is to produce additional vortices. The existence of these additional vortical structures that arise from the jet has been conclusively verified and quantified in the current investigation. The strength of these jet vortices has been shown to be rather significant. Given this, within a few diameters downstream from its exit, the jet would deform into a shape predominantly governed by the induced velocity fields of various vortices that surround it. In the present configuration, the jet experiences both lateral stretching and vertical compression due to the dynamics of its neighboring vortices, and, ultimately, has a far quicker maximum velocity decay compared to that of the baseline coflowing jet of the same velocity ratio. In the process, the turbulence intensity location is shifted toward the incoming upwash region of the leading-edge vortices. The trajectories of leading-edge vortices in the present experiment have been shown to be influenced slightly by the jet again in a manner that could be accounted for by vortex dynamics. Moreover, if the leading-edge vortices begin to ingest a jet possessing a rather high momentum, the peak vorticity and circulation of the leading-edge vortices are shown to be substantially reduced.


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    Title :

    Aerodynamics of a jet in the vortex wake of a wing


    Additional title:

    Aerodyanamik eines Freistrahls im Nachstrom einer Tragfläche


    Contributors:

    Published in:

    AIAA Journal ; 40 , 3 ; 401-407


    Publication date :

    2002


    Size :

    7 Seiten, 13 Bilder, 15 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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