三电极共面介质阻挡放电的放电特性及诱导气流实验研究

Experimental Study on Discharge Characteristics and Induced Airflow of Three-Electrode Coplanar Dielectric Barrier Discharge

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.

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.