Investigation of the Flow Structure on a Flat Plate Induced by Unsteady Plasma Actuation with DNS Methods

YU Jianyang (俞建阳); CHEN Fu (陈浮); LIU Huaping (刘华坪); SONG Yanping (宋彦萍)

doi:10.1088/1009-0630/17/12/09

Plasma Science and Technology > 2015 > 17(12): 1032-1037. > DOI: 10.1088/1009-0630/17/12/09

YU Jianyang (俞建阳), CHEN Fu (陈浮), LIU Huaping (刘华坪), SONG Yanping (宋彦萍). Investigation of the Flow Structure on a Flat Plate Induced by Unsteady Plasma Actuation with DNS Methods[J]. Plasma Science and Technology, 2015, 17(12): 1032-1037. DOI: 10.1088/1009-0630/17/12/09

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Investigation of the Flow Structure on a Flat Plate Induced by Unsteady Plasma Actuation with DNS Methods

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Funds: supported by the Foundation for Innovative Research Groups of National Natural Science Foundation of China (No. 51121004) and National Natural Science Foundation of China (No. 50976026)

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Received Date: November 16, 2014

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Abstract

Abstract

An investigation into the flow characteristic on a flat plate induced by an unsteady plasma was conducted with the methods of direct numerical simulations (DNS). A simplified model of dielectric barrier discharge (DBD) plasma was applied and its parameters were calibrated with the experimental results. In the simulations, effects of the actuation frequency on the flow were examined. The instantaneous flow parameters were also drawn to serve as a detailed study on the behavior when the plasma actuator was applied to the flow. The result shows that induced by the unsteady actuation, a series of vortex pairs which showed dipole formation and periodicity distribution were formed in the boundary layer. The production of these vortex pairs indicated a strong energy exchange between the main flow and the boundary layer. They moved downstream under the action of the free stream and decayed under the influence of the fluid viscosity. The distance of the neighboring vortices was found to be determined by the actuation frequency. Interaction of the neighboring vortices would be ignored when the actuation frequency was too small to make a difference.
- fluid dynamics,
- flow structure,
- dielectric barrier discharge,
- DNS

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References

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