S0530101 Analysis of Periodic Fluctuating Body Force Field in DBD Plasma Actuator Using the Particle Image Velocimetry

2015 ◽  
Vol 2015 (0) ◽  
pp. _S0530101--_S0530101-
Author(s):  
Tsubasa Sekiya ◽  
Kosuke Ota ◽  
Hiroyuki Nishida
Keyword(s):  
Particle Image Velocimetry ◽  
Force Field ◽  
Body Force ◽  
Particle Image ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
Image Velocimetry

Wall Normal Jet Produced by DBD Plasma Actuator With Doughnut-Shaped Electrode

2008 ◽  
Author(s):  
Takehiko Segawa ◽  
Hiro Yoshida ◽  
Shinya Takekawa ◽  
Timothy Jukes ◽  
Kwing-So Choi
Keyword(s):  
Atmospheric Pressure ◽  
Room Temperature ◽  
Particle Image ◽  
Barrier Discharge ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
Annular Jet ◽  
Image Velocimetry ◽  
Inner Diameter ◽  
Annular Jets

Properties of coaxial annular jets produced by a dielectric barrier discharge (DBD) plasma actuator with a doughnut shaped electrodes were investigated under atmospheric pressure and room temperature. The actuator consists of two circular electrodes sandwiching a thin dielectric layer. By applying 0 – ±3.3 kV between the electrodes at radio frequencies, the plasma jet is formed near the inner edge of the top electrode. The radial jet runs toward the center of the electrode and then impinges at the center to generate a wall normal annular jet. The evolution of the wall normal jet was observed precisely using particle image velocimetry (PIV) system. It was found that characteristic velocities increase in proportion to the bursting frequency and inversely proportional to the inner diameter of the electrode at the surging time of the voltage at 5.0 × 10−6sec.

Flow visualization and mechanisms of three-electrode sliding discharge plasma actuator

2019 ◽  
Vol 233 (13) ◽  
pp. 4788-4799
Author(s):  
Borui Zheng ◽  
Jie Chen ◽  
Chang Ge ◽  
Xizheng Ke ◽  
Hua Liang
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Discharge Plasma ◽  
Plasma Actuator ◽  
Half Cycle ◽  
Continuous Mode ◽  
Dc Voltage ◽  
Image Velocimetry ◽  
Induced Velocity ◽  
Sliding Discharge

The unsteady flow characteristics induced by a three-electrode sliding discharge plasma actuator under different actuation modes were analyzed by ensemble averaged and phase-locked particle image velocimetry. The discharge morphologies, voltage–current waveforms, and particle image velocimetry data in continuous mode were compared to clarify the performance modification mechanism of the pulsed three-electrode sliding discharge. The particle image velocimetry results revealed that deformation of the electromagnetic field around the additional electrode caused by applying a high DC voltage triggers changes in the induced flow field. When the three-electrode sliding discharge plasma actuator is actuated in continuous mode, a strong accelerated wall jet and homogeneous discharge region covering the whole gap between the two exposed electrodes are generated. The large discharge extension mainly results from the accelerated drift of positive ion particles created during the positive half cycle, while negatively ionized particles have a significantly larger impact on the induced velocity production process. In the pulsed mode, when a positive high DC voltage ( VDC = 18 kV) is applied to the additional electrode, both the size and magnitude of the induced vortex structures increase, and highly accelerated regions are periodically generated. When V DC = −18 kV, the induced velocity field evens out, the accelerated region becomes less obvious, the intensity of both the primary and secondary vortices decreases, and the vortex structure dissipates faster, owing to the turbulent motion of ionized particles. An additional positive DC component attracts the negatively ionized particles during the negative half cycle, improving the velocity and intensity of the stream-wise vortices, which is very attractive for flow control applications.

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