• Title/Summary/Keyword: Dielectric-Barrier-Discharge Actuator

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Study on Characteristics of DBD Plasma Actuator as Design Parameters for Plasma Flow Control (플라즈마 유동제어를 위한 DBD 플라즈마 액츄에이터의 설계변수에 따른 특성 연구)

  • Yun, Su-Hwan;Kwon, Hyeok-Bin;Kim, Tae-Gyu
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.6
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    • pp.492-498
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    • 2012
  • Characteristics of DBD(Dielectric Barrier Discharge) plasma actuator as design parameters were investigated for plasma flow control. Flow velocity and power consumption of the DBD plasma actuator were measured according to the design parameters such as discharge voltage and frequency, gap, width and length of electrode, and the thickness of dielectric barrier. The flow velocity and power consumption increased as the discharge voltage and frequency increased. As the electrode gap increased, the flow velocity increased with decreasing the power consumption, whereas high voltage was required for the plasma discharge. The flow velocity increased as the upper-electrode width decreased, and as the lower-electrode width increased at the constant power consumption. The performance of the DBD plasma actuator can be estimated at the given discharge and geometry conditions.

Experimental Study on Effect of Electrode Material and Thickness in a Dielectric Barrier Discharge Plasma Actuator Performance (전극 재료 및 두께가 DBD 플라즈마 액추에이터의 성능에 미치는 영향에 대한 실험적 연구)

  • Lee, Seung-Yeob;Shin, You-Hwan
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.3
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    • pp.46-50
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    • 2012
  • Plasma actuator makes parallel flow on the wall surface by the interaction between plasma and neutral air particles. Dielectric barrier discharge (DBD) plasma actuator is widely studied as one type of plasma actuators, which consists of one electrode exposed to the environmental gas and the other encapsulated by a dielectric material. This paper is experimentally focused on the performance of DBD plasma actuator mounted on a flat plate, which depends on kinds of the electrode materials, their thicknesses and the supplied voltage including its frequency. We measured the velocity magnitudes of the induced flow by a stagnation probe as a performance parameter of the plasma actuators. The velocity profiles of the flow induced by the plasma actuators are similar in all measurement cases. The magnitude of the induced velocity is strongly influenced by the thickness of the electrodes and the frequency of the input voltage. The performance of DBD plasma actuators is related to the electric properties of the electrode materials such as the ionization energy and the electrical resistivity.

Numerical Investigation of Scattering from a Surface Dielectric Barrier Discharge Actuator under Atmospheric Pressure

  • Kim, Yuna;Kim, Sangin;Kim, Doo-Soo;Oh, Il-Young;Yook, Jong-Gwan
    • Journal of electromagnetic engineering and science
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    • v.18 no.1
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    • pp.52-57
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    • 2018
  • Surface dielectric barrier discharge (SDBD), which is widely used to control turbulence in aerodynamics, has a significant effect on the radar cross-section (RCS). A four-way linearly synthesized SDBD air plasma actuator is designed to bolster the plasma effects on electromagnetic waves. The diffraction angle is calculated to predict the RCS because of the periodic structure of staggered electrodes. The simplified plasma modeling is utilized to calculate the inhomogeneous surface plasma distribution. Monostatic RCS shows the diffraction in the plane perpendicular to the electrode array and the notable distortion by plasma. In comparison, the overall pattern is maintained in the parallel plane with minor plasma effects. The trends also appear in the bistatic RCS, which has a significant difference in the observation plane perpendicular to the electrodes. The peaks by Bragg's diffraction are shown, and the RCS is reduced by 10 dB in a certain range by the plasma effect. The diffraction caused by the actuator and the inhomogeneous air plasma should be considered in designing an SDBD actuator for a wide range of application.

Wind Tunnel Test of 2D Model for Plasma Flow Control using DBD Plasma Actuator (DBD 플라즈마 구동기를 이용한 2차원 모델의 플라즈마 유동제어 풍동시험)

  • Yun, Su-Hwan;Kim, Tae-Gyu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.527-528
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    • 2012
  • DBD (Dielectric Barrier Discharge) plasma actuator was designed for aerodynamic drag reduction using plasma flow control, and the drag reduction was measured by wind-tunnel tests using 2D test model. At the zero wind velocity, the plasma flow control had no effect on the drag reduction because the flow separation and surface friction drag were not occurred. At the wind velocity of 2m/s, 9.7% of drag was reduced by the flow separation control. The drag reduction decreased as the wind velocity increased.

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Momentum Measurement of Induced Flow by DBD Plasma Using PIV (PIV를 이용한 DBD 플라즈마 유도 유동장 운동량의 예측)

  • Sohn, Jun Ha;Kim, Namhoon;Kim, Kyungyeon;Furudate, Michiko Ahn
    • Journal of the Korean Society of Visualization
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    • v.17 no.1
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    • pp.53-59
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    • 2019
  • Particle image velocimetry is performed in order to analyze flowfield induced by a dielectric barrier discharge plasma actuator. The velocity vector fields are obtained for the two different input voltage conditions; the voltage 3 and 5 kV at the frequency 10 kHz. The obtained flowfields show that the air is accelerated and its speed increase almost linearly over the covered electrode. The amount of momentum induced by the DBD plasma actuator is estimated from the obtained velocity fields, and the estimated values reasonably agree with the previous experiment.

Radar Cross Section Reduction by Planar Array of Dielectric Barrier Discharge Plasma under Atmospheric Pressure (평면 배열 유전체 장벽 방전 플라즈마 발생기의 대기압에서의 레이다 단면적 감소 효과)

  • Kim, Yuna;Kim, Sangin;Kim, Doo-Soo;Lee, Yongshik;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.8
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    • pp.646-652
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    • 2017
  • The effect of plasma on mono-static radar cross section under atmospheric pressure is demonstrated when the dielectric barrier discharge actuator has plasma layer. The volume of plasma layer is increased by using planar array of electrodes. Because the incident wave has electric field which is perpendicular to the electrode array, the undesired effect on radar cross section caused by structure of plasma actuator is minimized. In experiments, mono-static radar cross section is measured at the frequencies from 2 GHz to 25 GHz. The generated plasma reduces the radar cross section at frequencies above 18 GHz, and the amount of reduction reaches to 8 dB in maximum. The reduction can be controlled by changing the peak-to-peak voltage from high voltage generator. The result shows the possibility of plasma as a flexible radar cross section controller.

Analysis and Performance Evaluation of DBD Actuator for Plasma Flow Control (플라즈마 유동 제어를 위한 DBD 엑츄에이터 해석 및 성능평가)

  • Lee, Chang-Wook;Yun, Su-Hwan;Kim, Tae-Gyu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.290-293
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    • 2012
  • The analysis and performance evaluation of DBD actuator for plasma flow control was described. The experimental apparatus was designed to measure the flow velocity as the discharge conditions, and to find out the optimal discharge condition of the DBD actuator. The average-velocity increased with increasing the discharge voltage. The experimental results was compared with CFD analysis.

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Analysis of Electromagnetic Wave Scattering Characteristics of Dielectric Barrier Discharge Plasma (유전체 장벽 방전 플라즈마의 전자파 산란 특성 분석)

  • Lee, Soo-Min;Oh, Il-Young;Hong, Yong-Jun;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.3
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    • pp.324-330
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    • 2013
  • This paper presented measurement results of scattering characteristics of dielectric barrier discharge (DBD) plasma at atmospheric pressure. In this paper, plasma actuator is fabricated by parallel connecting of basic configuration of DBD plasma actuator, then plasma could be generated by applying 14 kV, 4 kHz of high voltage generator. In order to measure the scattering characteristics of DBD plasma, in this paper, two horn antennas and vector network analyzer are used to compare the S-parameter. Because of the structure of fabricated plasma generator, different result is obtained as antenna polarization changes. When antenna polarization is parallel to electrodes of plasma generator, the scattered field is reduced by 2 dB in maximum. In addition, for parallel polarization case, PEC is set up behind the plasma generator to measure backward scattered field. When the observation angles are $40^{\circ}C$ and $60^{\circ}C$, the amount of reduced scattered field is 2 dB in maximum at 5 GHz.

Effect of Plasma Area on Frequency of Monostatic Radar Cross Section Reduction

  • Ha, Jungje;Shin, Woongjae;Lee, Joo Hwan;Kim, Yuna;Kim, Doosoo;Lee, Yongshik;Yook, Jong-Gwan
    • Journal of electromagnetic engineering and science
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    • v.17 no.3
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    • pp.153-158
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    • 2017
  • This work reports on the effect of plasma area on the frequency characteristics of the monostatic radar cross section (RCS) of a square metallic plate. A dielectric barrier discharge (DBD) plasma actuator consisting of 10 rings is proposed. The actuator is fabricated in three different configurations such that only three inner rings, seven inner rings, and all rings can be biased. By applying an 18-kV bias at 1 kHz, the three types of DBD actuators generate plasma with a total area of 16.96, 36.74, and $53.69cm^2$, respectively, in a ring or circular form. The experimental results reveal that when the DBD actuator is placed in front of a $20mm{\times}20cm$ conducting plate, the monostatic RCS is reduced by as much as 18.5 dB in the range of 9.41-11.65 GHz. Furthermore, by generating the plasma and changing the area, the frequency of maximum reduction in the monostatic RCS of the plate can be controlled. The frequency is reduced by nearly 20% in the X band when all rings are biased. Finally, an electromagnetic model of the plasma is obtained by comparing the experimental and full-wave simulated results.

Attenuation Effects of Plasma on Ka-Band Wave Propagation in Various Gas and Pressure Environments

  • Lee, Joo Hwan;Kim, Joonsuk;Kim, Yuna;Kim, Sangin;Kim, Doo-Soo;Lee, Yongshik;Yook, Jong-Gwan
    • Journal of electromagnetic engineering and science
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    • v.18 no.1
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    • pp.63-69
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    • 2018
  • This work demonstrates attenuation effects of plasma on waves propagating in the 26.5-40 GHz range. The effect is investigated via experiments measuring the transmission between two Ka-band horn antennas set 30 cm apart. A dielectric-barrier-discharge (DBD) plasma generator with a size of $200mm{\times}100mm{\times}70mm$ and consisting of 20 layers of electrodes is placed between the two antennas. The DBD generator is placed in a $400mm{\times}300mm{\times}400mm$ acrylic chamber so that the experiments can be performed for plasma generated under various conditions of gas and pressure, for instance, in air, Ar, and He environments at 0.001, 0.05, and 1 atm of pressure. Attenuation is calculated by the difference in the transmission level, with and without plasma, which is generated with a bias voltage of 20 kV in the 0.1-1.4 kHz range. Results show that the attenuation varies from 0.05 dB/m to 9.0 dB/m depending on the environment. Noble gas environments show higher levels of attenuation than air, and He is lossier than Ar. In all gas environments, attenuation increases as pressure increases. Finally, electromagnetic models of plasmas generated in various conditions are provided.