不同类型多级等离子体激励器诱导气流的力学特性研究

Investigation on Mechanical Properties of the Airflow Induced by Different Kinds of Multi-DBD Plasma Actuators

等离子体激励器通过产生的等离子加速气流,可以实现对流动的控制。单级等离子体激励器由于受到等离子体放电的物理限制,其控制作用较小;为了提高等离子体流动控制的效果,关于多级等离子体激励器的研究得到发展。采用图像采集和粒子示踪测速系统(PIV),对传统多级等离子体激励器和多级双极性等离子体激励器的放电现象以及气流加速进行研究,并通过流场速度分布计算等离子体激励器对空气产生的推力和吸力。结果表明:随着电压的升高,传统多级等离子体激励器产生的推力和吸力会逐渐减弱;而多级双极性等离子体激励器产生的推力和吸力均呈逐渐增强的趋势。

Plasma produced by plasma actuator can be used to accelerate the airflow, which will achieve the control of flow. However, because of the physical limitations of the plasma discharge, Single-DBD（Dielectric Barrier Discharges） plasma actuators which are widely used always suffer from the feeblish control effect, extremely limiting the development of plasma flow control technology. In order to improve the effect of plasma flow control, researchers have carried out a lot of research works on multi-DBD plasma actuators. By using image acquisition and PIV（Particle Image Velocimetry） equipment, discharge phenomenon and flow acceleration excited by traditional multi-DBD plasma actuator and bipolar-DBD plasma actuator are studied. And the thrust and suction via the velocity distribution of the flow field which is generated by the plasma actuators are calculated. Research results show that the thrust and suction produced by the traditional multi-DBD plasma actuator will become weak with the increase of voltage＇ for the bipolar-DBD plasma actuator, both of the thrust and suction will gradually increase with the voltage increasing.