Mechanisms for laminar separated-flow control using dielectric-barrier-discharge plasma actuator at low Reynolds number

2015 ◽  
Vol 27 (11) ◽  
pp. 117101 ◽  
Author(s):  
Makoto Sato ◽  
Taku Nonomura ◽  
Koichi Okada ◽  
Kengo Asada ◽  
Hikaru Aono ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Flow Control ◽  
Dielectric Barrier Discharge ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Separated Flow ◽  
Plasma Actuator ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Barrier Discharge Plasma

Flow control for suppression of self-excited rolling oscillation at high angles of attack

2016 ◽  
Vol 231 (13) ◽  
pp. 2408-2422 ◽  
Author(s):  
Xi Geng ◽  
Zhiwei Shi ◽  
Keming Cheng ◽  
Zheng Li
Keyword(s):  
Flow Control ◽  
Dielectric Barrier Discharge ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Plasma Actuator ◽  
Vortex Generators ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Barrier Discharge Plasma ◽  
High Angles Of Attack

A cruciform-finned slender body can excite a limit-cycle rolling oscillation at high angles of attack. To suppress the unwanted motions, flow control approaches should be employed if the aerodynamic control surfaces lose control efficiency at high angles of attack. As a promising technology, the ns-dielectric barrier discharge plasma actuator has been successfully used in high-speed and high-Reynolds-number flow control applications. The present work employs a π-type ns-dielectric barrier discharge plasma actuator and vortex generators to suppress self-excited rolling oscillation at α = 50°. The free-to-roll tests show that the plasma actuator ignited at F+ ∼ 1.5 and that the vortex generators can suppress rolling oscillation. The flow patterns from particle image velocimetry measurement at different cross-sections and rolling angles suggest that the vorticity decrease of the leeward vortices may be the control mechanism for the plasma actuator. For the vortex generators, evident modification of the flow field structure can be observed due to the vortices generated from the vortex generators, which decreases the rolling moment induced by the asymmetry vortices to suppress the self-excited rolling oscillation.

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