补气式等离子体射流发生器实验研究

提出一种补气式等离子体射流(ASPSJ)发生器,在常规火花放电式等离子体射流(PSJ)发生器腔体上连接单向阀,改善发生器吸气复原阶段的补气量和射流的连续性,以获得能量更高的合成射流。研究了在不同加载电参数下,不同类型单向阀对发生器最大射流速度的优化作用;通过正交实验法确定了补气式等离子体射流发生器的最佳工作电参数,以获得最高的合成射流速度。文中的等离子体射流发生器配以所选择的补气单向阀,最优加载电压频率为150 Hz,幅值为50 kV,占空比为15%。实验结果表明,补气式等离子体射流发生器将最大射流速度提升20%以上,高射流速度的工作频带由单点扩展到100 Hz,以期在应用于流动控制时获得更好的效果。研究成果为后续的主动流动控制的应用研究提供了指导。

Experimental research on air supplementing type plasma synthetic jet generator

An air supplementing type plasma synthetic jet (ASPSJ) generator has been developed in this paper. A one-way check valve, increasing the air refill supply at the recover stage, is connected to a typical spark discharge plasma synthetic jet (PSJ) generator. The ASPSJ improves jet flow continuity of typical PSJ and can get higher energy synthetic jet. The effect of different valves on the maximum average jet flow speed is researched with different electric parameters. The best electric parameters for the highest synthetic jet flow speed are obtained by orthogonal test. For the test ASPSJ generators, the best loading voltage frequency, amplitude, and duty cycle are 150 Hz, 50 kV and 15%. The results show that ASPSJ strengthens the maximum average jet flow speed by above 20%. The best actuation frequency is increased, and the actuation frequency bandwidth for maximum jet flow speed enlarges from one point to 100 Hz. Better airflow control effect can be expected by ASPSJ in wind tunnel tests. The research results provide guidance for further active flow control application.