Experimental study on drag reduction of L-shaped bluff body by AC-DBD plasma actuation

LAN Ziqi; SHI Zhiwei; SUN Qijie; GENG Xi

doi:10.11729/syltlx20200095

Volume 35 Issue 2

Apr. 2021

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Journal of Experiments in Fluid Mechanics > 2021 > 35(2): 83-91. > DOI: 10.11729/syltlx20200095

LAN Ziqi, SHI Zhiwei, SUN Qijie, GENG Xi. Experimental study on drag reduction of L-shaped bluff body by AC-DBD plasma actuation[J]. Journal of Experiments in Fluid Mechanics, 2021, 35(2): 83-91. DOI: 10.11729/syltlx20200095

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Experimental study on drag reduction of L-shaped bluff body by AC-DBD plasma actuation

Key Laboratory of Unsteady Aerodynamics and Flow Control, Ministry of Industry and Information Technology, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Received Date: August 18, 2020
Revised Date: November 08, 2020

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Abstract

Plasma flow control is a widely used active flow control method. In order to further expand the application scope and understand the actuation mechanism, three kinds of AC-DBD (Dielectric Barrier Discharge) plasma actuator layout forms are used to compare the drag reduction capabilities of the L-shaped model after actuation, and the drag reduction mechanism is studied. The experiment is carried out in a low-speed DC wind tunnel, with a wind direction angle of 0°, and a wind speed of 2-8 m/s. These different actuators layout forms are the plasma actuator placed close to the leading edge along the incoming flow direction, the plasma actuator placed close to the leading edge against the incoming flow direction, and the plasma actuator arranged at the corner, respectively. Research shows that plasma actuators under different wind speed conditions have a certain control effect on drag reduction of bluff bodies, and the control ability decreases with the increase of wind speed. The plasma actuator placed in the corner produces the best control effect, and the drag reduction rate can reach more than 13% at low speed. The plasma actuator placed close to the leading edge against the incoming flow direction produces a similar effect. The drag reduction rate of the plasma actuator near the leading edge along the inflow direction can only reach about 7% at most. By analyzing the flow field, it is shown that the change of layout position produces different disturbance effects. Different flow control mechan-isms are the key factors affecting the actuation effect.
- plasma flow control,
- wind tunnel test,
- wind load drag reduction,
- pressure coefficient,
- particle image velocimetry

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Experimental study on drag reduction of L-shaped bluff body by AC-DBD plasma actuation

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