放电电阻对等离子合成射流激励器特性的影响

设计了一种射流出口为竖直圆孔的等离子体合成射流激励器(PSJA),旨在研究在不同放电电阻时激励器的特性。实验中通过电参数测量、高速纹影观察获得了放电电阻为300、200、100 Ω的激励器放电特性及瞬态流场特性。结果表明:放电过程由于限流电阻的存在,可分为两个阶段,即急剧放电阶段和缓慢放电阶段。这一模式在满足较高初始能量注入的同时可以持续为激励器提供能量,有效提高了稳定性。同时,观察到较小的放电电阻,可以获得较大的射流速度,流动控制能力更强。但减小放电电阻,会导致放电电流增大,射流速度不稳定,工作稳定性变差。在实际应用中,需要综合考虑并确定最终的电阻值,确保两个放电阶段能量的合理分配。 

Effect of discharge resistor on performance of plasma synthetic jet actuator

A plasma synthetic jet actuator (PSJA) with normal orifice was designed to study the effect of discharge resistor. The discharge characteristics and transient flow-field characteristics of actuator with 100,200,300 Ω were researched by electric parameter measurement system and high-speed schlieren technology. Results showed that the discharge process can be divided into two stages due to the existence of current limiting resistance, rapid discharge stage and slow discharge stage.This mode can continuously provide energy to the actuator while satisfying the higher initial energy injection, and effectively improve the stability of the actuator.At the same time, the smaller discharge resistance can obtain greater jet velocity, enhancing the jet flow control capability.The smaller discharge resistance led to the increase of discharge current, unstable velocity and worsening of working stability.In practical application, it was necessary to consider and determine the final resistance value comprehensively to ensure the rational distribution of energy in the two discharge stages.