锯齿形等离子体激励器纳秒脉冲放电及红外辐射温度特性

Characteristic of Discharge and Infrared Radiation Temperature of Saw-toothed Plasma Actuators Under Nanosecond-pulse Voltage

为优化表面介质阻挡放电激励器的布局形式,基于ns脉冲表面介质阻挡放电快速放热诱导压缩波进行流动控制的原理,设计了具有平面和锯齿类型高压电极的激励器。在ns脉冲电压的驱动下,研究了其放电特性和激励器表面红外辐射温度特性,并比较了3种激励器的放电能量、峰值功率、峰值电流、表面红外辐射温度。结果表明:施加同样电压时,高压电极为锯齿形的激励器具有较高的放电电流、瞬时放电功率以及放电能量;3种激励器表面温度最高处均位于高、低压电极之间的介质表面处,且锯齿形激励器表面的局部最高红外辐射温度可达88℃,高于平面形激励器的72℃。从脉冲放电能量和表面红外辐射温度的角度验证了锯齿形激励器在流动控制上具有潜在优势,可供提升流动控制效果和优化激励器参考。

In order to optimize the form of an actuator, which is used for flow control, on the basis of the mechanism of the shock wave induced by instantaneous heating from the nanosecond pulse surface dielectric barrier discharge, we designed three actuators, possessing plane and saw-toothed high-voltage electrodes, respectively. Driving them by high-voltage nanosecond pulses, we investigated their discharge characteristics and surface infrared radiation tempera- tures, and compared their discharge energies, peak powers, peak currents, and surface infrared radiation temperatures. It is found that the actuator with saw-toothed high-voltage electrodes has higher discharge energy, peak power, and peak current. For all the three actuators, the highest temperatures locate on the dielectric surface between the electrodes. The local highest temperature of the saw-toothed actuator is 88 ℃, higher than that of the planar actuator, which is 72 ℃. Hence, the potential advantages of saw-toothed actuator in aspects of discharge energy and infrared radiation temperature are verified. The results could be used as a reference for enhancing the flow control and optimizing the actuators.