低气压条件下多缝式等离子体合成射流激励器特性实验

设计了一种低气压条件下工作的大间距多缝式等离子体合成射流激励器,旨在应用于高空飞行器的内部流动控制。实验中利用气体放电电压在低气压条件下迅速降低的特性,将激励器放电电极间距设计为26mm,使激励器腔体和出气口均得到显著拉长,并通过电参数测量、高速纹影观察分别研究了其放电特性及瞬态流场特性。实验结果表明:激励器的初始射流锋面速度达到了761m/s,故在高速流动控制中具有较大的应用潜力。此外,激励器射流导致的压缩波和射流边界均接近半椭圆形,具有较大的流场均匀区,因此其流动干扰能力和动量交换能力较常规孔式射流要更强。 

Experiment on characteristics of plasma synthetic jet actuator with multiple slots under low pressure condition

A large interval plasma synthetic jet actuator (PSJA) with multiple slots under low pressure condition was designed to control the flow-field for high-altitude vehicle.Since the breakdown voltage decreased rapidly under low pressure condition, the distance of cathode and anode can be extended to 26mm, much larger than that of traditional PSJA. This optimization also could make the cavity and output of actuator extend remarkably. The discharge characteristics and flow-field were researched by electric parameter measurement system and high-speed schlieren technology, respectively.The results showed that the initial jet velocity of the actuator reached 761m/s, indicating the actuator had excellent application prospect in high speed flow control.In addition, comparing with the normal perforated jet generated by the actuator, the compression wave and plasma jet appeared in an ellipse shape with a large flat portion, contributing to enhance the perturbation and momentum exchange capability.