Experimental Study on Discharge Characteristics and Induced Airflow of Three-Electrode Coplanar Dielectric Barrier Discharge
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摘要:
等离子体流动控制激励器由于其响应速度快、激励频带宽、能量损耗低、可靠性强的优势，在航空航天领域的主动流动控制等方面得到了广泛应用.文章提出了一种新型的等离子体气动激励器——三电极共面介质阻挡放电激励器，研究了该激励器电极结构对放电特性和诱导气流速度的影响，并与传统共面介质阻挡放电和沿面介质阻挡放电激励器进行了比较.结果表明：（1）随着激励电压的提高，高压电极和地电极之间先出现了丝状放电并逐渐延伸到第三电极；（2）随着第三电极与高压电极之间的距离增大，诱导气流速率从2.4 m/s下降到0 m/s，而第三电极宽度的变动对诱导气流速度影响可忽略不计；（3）相同外部条件下，该激励器诱导的气流速度小于沿面介质阻挡放电激励器，但高于共面介质阻挡放电激励器.
Abstract:Due to its fast response, wide excitation band, low power consumption and strong reliability, plasma flow control actuators are widely used in active flow control in aerospace field. This work demonstrated a plasma flow control actuator based on three-electrode coplanar dielectric barrier discharge (TCDBD). The effects of the electrode structure on the discharge characteristics and the induced airflow velocity were investigated. In addition, the comparison of the TCDBD actuator with the surface dielectric barrier discharge(SDBD) actuator and coplanar dielectric barrier discharge (CDBD) actuator was conducted. The results show that (1) As the applied AC voltage increases, the filamentary discharge starts first between the high voltage electrode and ground electrode, and then extends to the floating third electrode. (2) With the increase of the distance between the third electrode and the high voltage electrode, the airflow velocity induced by the TCDBD actuator drops from 2.4 m/s to 0 m/s. However, the effect of the width of the third electrode on the airflow speed is negligible. (3)Under the same external conditions, the airflow velocity induced by TCDBD is lower than that by SDBD but higher than that by CDBD.
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图 2 第三电极不同激励电压(峰峰值)下TCDBD的放电图片
Figure 2. Discharge picture of TCDBD under different excitation voltages(peek-to-peek values)
图 3 不同激励电压(峰峰值)下TCDBD的电压和电流波形
Figure 3. Voltage and current waveform of TCDBD under different excitation voltages(peek-to-peek values)
图 4 不同激励电压(峰峰值)下TCDBD激励器的Lissajous图
Figure 4. Lissajous diagram of TCDBD actuator with different excitation voltages (peak-to-peak values)
图 5 第三电极与高压电极不同距离(d1)下TCDBD放电图
Figure 5. TCDBD discharge diagram under different distances(d1) between the third electrode and the high voltage electrode
图 6 激励电压(峰峰值)U=28 kV下TCDBD激励器诱导出的水平方向气流速度Uf与d1的关系曲线
Figure 6. Relation curve between horizontal flow velocity Uf and d1 induced by TCDBD actuator under excitation voltage (peak-to-peak value) U=28 kV
图 7 第三电极不同宽度(d2)下TCDBD放电图
Figure 7. TCDBD discharge diagram under different widths(d2) of the third electrode
图 8 激励电压(峰峰值)U=28 kV下TCDBD激励器诱导出的水平方向气流速度Uf与第三电极宽度d2的关系曲线
Figure 8. Relation curve between horizontal flow velocity Uf and third electrode width(d2) induced by TCDBD actuator under excitation voltage (peak-to-peak value) U=28 kV
图 11 3种不同介质阻挡放电电压电流图
Figure 11. Voltage and current diagrams of three different dielectric barrier discharges
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