多级双极性等离子体激励器加速气流的实验研究  

Experimental study of flow acceleration using plasma actuator of multi-bipolar electrodes

作　　者：郝江南[1] 蔡晋生[1] 李尹喆[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国防科技重点实验室,西安710072

出　　处：《中国科学：物理学、力学、天文学》2012年第5期538-546,共9页Scientia Sinica Physica,Mechanica & Astronomica

摘　　要：等离体激励是一种新的流动控制手段,通过其产生的等离体加速流,从而实现对流动的控制.然而,单一等离体激励因其加速流的效果受到身流向度的限制,其应用范围通被局限在小尺度的物体上.目前采用的决方法是将多个传统等离体激励并联成一组,成多级激励,然而前后电极的相互干扰大大降低了这种多级激励的工作效率.本文提出了一种新等离体激励的串联方案,也就是将多级激励中前一级的下电极都与后一级的上电极相连,成一种新多级双极性等离体激励.粒示踪测速系统(PIV)对该激励加速流的实验果表明,这种新多级激励能够消除前后电极之间的相互干扰,大大提高多级等离体激励加速流的效率.Dielectric barrier discharge （DBD） plasma actuators can be used in flow control applications due to the momentum transfer from plasma to fluid. Due to geometry limitation, however, only small trust can be obtained by DBD plasma actuators, which limits its application in large-scale flow problems. Usually, several surface DBDs are combined in series to obtain a single multistage actuation surface. However, the mutual interaction between successive discharges limits the effectiveness of such multi-DBD actuators. In this paper, a new multi-bipolar DBD plasma actuator is proposed for large-scale flow control applications. An innovative method for constructing multiple plasma actuators of bipolar electrodes is introduced to enhance the thrust. Multi-bipolar electrodes are adopted with the electrode of former covered 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 above the multi-bipolar actuator. It is concluded that compare to traditional actuators the new configuration can increase the thrust significantly.

关 键 词：双极性电极  等离子体激励器  流动控制 

分 类 号：O355[理学—流体力学]