不同结构等离子体激励器的流场特性实验研究

Experimental Study on Flow Field Characteristics of Different Plasma Actuators

采用粒子成像测速(PIV)技术,在静止空气中测量了H型、O型和L型3种结构的介质阻挡等离子体激励器的诱导速度场,分析了流场结构,并研究了激励器设计参数对诱导速度的影响。研究结果表明,3种结构的激励器都产生了离开激励器表面向上的射流。其中O型和L型结构的激励器受电极电压的影响比较明显,随着电极电压的增加,射流速度的最大值增大。H型激励器的诱导射流速度受电极极间宽度影响,随着两侧电极间距的增大,所形成的射流速度也越大,并在极间宽度22 mm时达到最大值;O型激励器的诱导射流速度受激励器电极直径影响,随着电极直径的增大,所形成的射流速度也越大,在直径30 mm时达到最大值;L型激励器的诱导射流方向受电极夹角影响,随着两侧电极夹角的增大,射流从法向射流向平面射流转化。通过对不同结构等离子体射流激励器流场特性的研究,将为等离子体激励器的设计和工程应用奠定基础。

In this paper, the induced velocity fields of three plasma actuators of the H-type, O-type and L-type respectively are measured quantitatively by using the particle image velocimetry （PIV） in quiescent air. The flow field structures are ana- lyzed and the effects of the design parameters are studied. The results show that all the three plasma actuators can induce an upward jet flow. The jet flow velocities of the O-type and L-type are obviously affected by the excitation voltage： they increase with the increase of the excitation voltage. The velocity of the jet flow induced by the H-type actuator is influenced by the width between the electrodes, which increases with the increasing width between the electrodes, and the maximum velocity emerges at the width of 22 mm. The velocity of the jet flow induced by the O-type actuator is influenced by the diameter of the electrodes, which increases with the increasing diameter of the electrodes, and the maximum velocity appears at the diameter of 30 mm. The direction of the jet flow induced by the L-type actuator is influenced by the angle of the electrodes. With the increase of the angle, the orientation of the jet flow changes from vertical to parallel. This research may serve as a basis for the design and application of plasma actuators.