The formation and motion of vortices generated by a dielectric barrier discharge (DBD) plasma actuator under periodic burst-mode actuation are investigated. The flowfield is studied using particle image velocimetry and schlieren visualization. The induced flowfield is very different from the single starting vortex generated by turning on a continuous steady-state actuation of the DBD actuator. A train of periodic vortices is formed by the periodic burst-mode actuation, with each burst cycle generating one vortex that travels along and away from the wall. The effects of the burst frequency and duty-cycle ratio on the vortex motion and structure are studied, and similarity laws are discovered. The velocity at which the vortex moves is shown to be independent of the duty-cycle ratio of the actuation. The velocity component along the wall, however, is found to increase with the burst frequency. A time-averaged wall jet velocity based on the actuation time during each burst cycle is identified and found to be independent of the burst frequency but increase with the duty-cycle ratio of the actuation. Self-similar patterns of the vortex flowfield are demonstrated for a short time duration after the vortex is formed within each burst cycle.


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    Title :

    Vortices Induced by a Dielectric Barrier Discharge Plasma Actuator Under Burst-Mode Actuation


    Contributors:
    Xue, Ming (author) / Gao, Chao (author) / Xi, Heng-Dong (author) / Liu, Feng (author)

    Published in:

    AIAA Journal ; 58 , 6 ; 2428-2441


    Publication date :

    2020-06-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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