双极性等离子体激励器流动控制特性研究

Investigation of flow control by using plasma actuator of bipolar electrode

提出了一种新型等离子体激励器,此激励器中前一级的下电极与后一级的上电极相连,形成双极性型电极。利用粒子示踪测速系统(PIV)对该激励器加速气流进行实验。结果表明:这种新型多级激励器能够消除前后电极之间的相互干扰,大大提高多级等离子体激励器加速气流的效率。同时,在低速风洞中进行了新型激励器对圆柱后尾流的控制初步实验,该新型激励器对圆柱尾流的控制效果显著。

In this paper, a new multi-bipolar DBD plasma actuator is proposed for large-scale flow control applications. Multi-bipolar electrodes are adopted with the eteetrode of former cov- ered electrode and later exposed electrode connected together. To validate the proposed method, particle image velocimetry （PIV） experiments are performed. The results show that cross-talk phenomenon can be reduced greatly and thus a constantly accelerating electric wind velocity can be obtained with the multi-bipolar actuator. It is concluded that comparing with traditional actua- tors the new configuration can increase the thrust significantly. We use this new designed actua- tor to control flow separation and associated unsteady vortex shedding from a circular cylinder in cross-flow. The test is performed at Rev=5.7 × 10^4 in a low speed wind tunnel. Unsteady actua- tion is applied on the circular cylinder model. The results of flow-control experiment in crossflow indicate that this type of plasma actuator is extremely effective in flow separation control.