Enhancement of electrohydrodynamic force with AC bias voltage in three-electrode dielectric barrier discharge plasma actuators
Enhancement of electrohydrodynamic force with AC bias voltage in three-electrode dielectric barrier discharge plasma actuators
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DOI：
10.1063/5.0100696
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发表时间：
2022-09
影响因子：
3.2
通讯作者：
Shintaro Sato;Mahoro Sakurai;N. Ohnishi
中科院分区：
文献类型：
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作者：
Shintaro Sato;Mahoro Sakurai;N. Ohnishi
基于分离电离和加速过程的概念，开发了一种新型的介质阻挡放电(DBD)等离子体激励器组件，该组件具有一个暴露电极和两个覆盖电极，以增强电流体动力的产生。传统的三电极结构的DBD等离子体激励器在暴露的电极之间存在意外的火花放电，从而无法增强加速带电粒子或产生稳定的离子风的电场强度。在本研究中，在介质层中嵌入了第三个电极以防止火花放电。此外，采用交流(AC)波形作为偏置电压，施加到第三电极，而不是传统DBD等离子体激励器中使用的直流(DC)电压。基于粒子图像测速技术的感应流显示结果表明，在DBD等离子体激励器中，由于电场屏蔽效应，直流偏置电压形成微弱的离子风，当施加交流偏置电压时，离子风周期性地出现。离子风的速度随频率和交流偏置电压幅值的增大而增大。此外，减小第二和第三电极之间的距离会导致离子风增强。本文的研究结果为进一步提高带电粒子加速电场强度对DBD等离子体激励器性能的改善提供了新的思路。
A novel dielectric barrier discharge (DBD) plasma-actuator module with an exposed electrode and two covered electrodes was developed to enhance electrohydrodynamic force generation based on the concept that it separates the ionization and acceleration processes. The conventional three-electrode configuration of the DBD plasma actuator suffers from unexpected spark discharge between the exposed electrodes, thereby failing to strengthen the electric field intensity for accelerating charged particles or generating a stable ionic wind. In this study, a third electrode was embedded in the dielectric layer to prevent spark discharge. Furthermore, an alternating current (AC) waveform was employed as the bias voltage, which was applied to the third electrode, instead of the direct current (DC) voltage used in a conventional DBD plasma actuator. Induced flow visualization using particle image velocimetry technique revealed that the DC bias voltage forms a weak ionic wind in the proposed DBD plasma actuator owing to the electric field screening effect, and the ionic wind periodically appears when the polarity of the voltage is reversed by applying an AC-bias voltage. The velocity of the ionic wind increases with increasing frequency and the AC bias voltage amplitude. Also, decreasing the distance between the second and third electrodes results in ionic wind enhancement. The results obtained in this study provide insights into the drastic improvement in the performance of DBD plasma actuators with the enhancement of the electric field intensity for charged particle acceleration.