并联放电等离子体合成射流激励器工作特性

Characteristics of plasma synthetic jet actuator array in parallel

等离子体合成射流激励器凭借射流速度高、工作频带宽、响应迅速等优势在高速流场主动流动控制领域具有良好的应用前景。为了克服单个激励器控制能力弱、控制范围窄的缺点,开展了并联放电等离子体合成射流激励器的研究,搭建了最多支持三路并联放电的微秒脉冲电源。测试结果表明,电源在空载及负载条件下可以实现1000 Hz稳定放电。随着放电电容的增大,放电电能的提高,等离子体电弧的温度升高,激励器腔体内气体被加热得更剧烈,产生的射流速度增大。随着工作频率的提高,激励器的击穿电压降低,放电电能减小,射流速度减小。通过对触发信号的调制,可以实现每个激励器的独立控制,使得并联式激励器具有更强的流动控制灵活性。试验结果显示,激励器工作相位与触发相位具有较好的对应关系。

Due to its superiorities of high exhaust speed,wide frequency band and rapid response,the plasma synthetic jet actuator has shown wide and promising application prospects in high-speed flow control.On account of the weak control authority and small affected area of single actuator,a parallel actuator array was investigated.A parallel microsecond-grade pulse power supply was developed to achieve a three-path discharge.The power supply shows good stability with and without the load at 1000 Hz working frequency.As the capacitor increases,the temperature of the plasma arc increases.The air in the actuator chamber is heated more prominently.So the speed of the jet rises.As the frequency increases,the jet speed decreases due to a lower breakdown voltage.The parallel actuators can be controlled independently by manipulating the trigger signals,which makes the parallel actuators more flexible than the serial actuators.The phase of the actuator was shown to be controlled accurately by the trigger signal.