高能表面电弧放电控制圆柱激波实验

采用风洞实验和高速纹影系统研究高能表面电弧等离子体激励控制圆柱激波. 在Ma=2的超声速风洞中, 分别放置了带有10, 15, 20 mm这3个不同高度圆柱的实验模型, 对比分析了不同高度圆柱的初始流场特征, 以及高能表面电弧放电的放电电容、直流源电压和圆柱高度对圆柱脱体激波控制的影响. 实验结果表明, 高能表面电弧等离子体激励诱导的冲击波和热气团与激波产生相互作用, 激波形状改变, 强度削弱. 圆柱高度越高其上方的弓形激波角越大, 在施加等离子体激励后, 弓形激波角减小, 激波强度减弱; 放电电容和直流源电压对激波控制效果的影响均呈正相关关系; 随着圆柱高度的增加, 控制效果减弱、有效控制作用时间缩短. 

Experiment on High-Energy Surface Arc Discharge in Controlling Cylindrical Shockwave

The control of a cylindrical shockwave through high-energy surface arc plasma excitation was investigated experimentally by high-speed schlieren system. In the supersonic wind tunnel with Ma=2, three experimental models with cylinder heights of 10, 15, 20 mm were set up respectively. The initial flow field characteristics of different cylinder heights, and the effects of discharge capacitance, DC source voltage and cylinder height on the control of cylindrical shockwave were compared and analyzed. The experimental results show that the blast wave and thermal bubble induced by high-energy surface arc discharge interact with the shockwave, resulting in shape change and intensity weakening of the shockwave. The bow shockwave angle decreases and the intensity of the bow shockwave weakens after applying the plasma actuation. The influence of discharge capacitance and DC source voltage on shock control is correlated positively. With the increase of cylinder height, the control action is weakened and the operating time of control is shortened.