Interaction of a jet flow induced by DBD plasma actuator with a wake behind a normal flat plate

2018 ◽  
Vol 2018.24 (0) ◽  
pp. GS0307
Author(s):  
Shion KAWASAKI ◽  
Kazumi TSUNODA ◽  
Katsuaki SUKEGAWA ◽  
Yoshiaki YAMASHIRO
2011 ◽  
Vol 2011 (0) ◽  
pp. _S054051-1-_S054051-4
Author(s):  
Masazumi ONISHI ◽  
Takashi ONO ◽  
Kouu KIN ◽  
Motoaki KIMURA

2017 ◽  
Vol 2017.52 (0) ◽  
pp. 113
Author(s):  
Kazuki HAYA ◽  
Ryoto TANAKA ◽  
Shota Izumi ◽  
Kazumi TSUNODA

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840035
Author(s):  
Zi-Jie Zhao ◽  
Y. D. Cui ◽  
Jiun-Ming Li ◽  
Jian-Guo Zheng ◽  
B. C. Khoo

Our previous studies in quiescent air environment [Z. J. Zhao et al., AIAA J. 53(5) (2015) 1336; J. G. Zheng et al., Phys. Fluids 26(3) (2014) 036102] reveal experimentally and numerically that the shock wave generated by the nanosecond pulsed plasma is fundamentally a microblast wave. The shock-induced burst perturbations (overpressure and induced velocity) are found to be restricted to a very narrow region (about 1 mm) behind the shock front and last only for a few microseconds. These results indicate that the pulsed nanosecond dielectric barrier discharge (DBD) plasma actuator has stronger local effects in time and spatial domain. In this paper, we further investigate the effects of pulsed plasma on the boundary layer flow over a flat plate. The present investigation reveals that the nanosecond pulsed plasma actuator generates intense perturbations and tends to promote the laminar boundary over a flat plate to turbulent flow. The heat effect after the pulsed plasma discharge was observed in the external flow, lasting a few milliseconds for a single pulse and reaching a quasi-stable state for multi-pulses.


Author(s):  
F. Rodrigues ◽  
José C. Páscoa ◽  
F. Dias ◽  
M. Abdollahzadeh

DBD plasma actuators are simple devices comprising two electrodes separated by a dielectric layer. One of the electrodes is covered by the dielectric layer and is completely insulated from the other one, which is exposed to the atmosphere in the top of the dielectric layer. The DBD plasma actuator operates by applying to the two electrodes an high voltage at high frequency from a power supply. When the amplitude of the applied voltage is large enough, in the exposed electrode, an ionization of the air (plasma) occurs over the dielectric surface which, in the presence of the electric field gradient, produces a body force on the ionized air particles. This induces a flow that draws ionized air along the surface of the actuator and it accelerates this neutral air towards downstream, in a direction tangential to the dielectric. Herein we will present this next generation plasma actuator for boundary layer control, which is demonstrated on the acceleration of the flow in a Coanda nozzle wall, thus contributing to help vectoring the exit jet flow. It will be shown that using only the plasma actuator it will be possible to vectorize the exit jet flow even under pure axial flow at the nozzle exit. Experimental results are obtained using flow visualization and Particle Image Velocimetry.


Author(s):  
Hongyu Jin ◽  
Takashi Ono ◽  
Motoaki Kimura

Dielectric barrier discharge (DBD) plasma actuators have been investigated by many researchers as flow-control devices. In the present study, we attempt to apply such actuators to a jet flow. In order to achieve enhanced mixing in a jet flow, we focused on the voltage and the frequency of the plasma actuator to examine their effect on the velocity and turbulence of the jet flow. This time, we examined how the induced flow by the plasma actuator electrode dimensions occurred. It was expected that higher velocity would have a larger effect on the jet flow in last year. In this study, we measured the flow velocity for different voltages and frequencies, and determined the most effective conditions for generating the induced flow. We apply that DBD plasma actuators to enhance turbulent intensity and jet flow’s diffusion.


2010 ◽  
Vol 2010 (0) ◽  
pp. 13-14
Author(s):  
Hongyu JIN ◽  
Takashi ONO ◽  
Tomokazu TAKANO ◽  
Motoaki KIMURA

2012 ◽  
Vol 2012 (0) ◽  
pp. 87-90
Author(s):  
Kentaro Sayo ◽  
Masazumi Onishi ◽  
Jun Asakura ◽  
Hongyu Jin ◽  
Motoaki Kimura

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