等离子体激励低速分离流动控制实验研究

Experimental study on the separation control by plasma actuator in subsonic flow

通过风洞流动显示实验,研究了等离子体激励低速条件下对平板表面分离剪切层的控制特性。结果表明等离子体激励在失速迎角附近可以有效抑制平板上的流动分离,实现流动的完全再附。在大迎角下可以显著减小平板完全分离后分离区的宽度。对比五种不同电极的实验,发现对于给定的输入电压及频率,负极宽度越宽,电极内侧正向间距越宽,其流动控制效果越好。最后通过改变发烟钢丝的位置和来流状况,证明了等离子体对周围流场的吸附和加速作用,对等离子体激励控制流动分离的机理进行了分析。

The smoke flow visualization was carried out in wind tunnel to investigate the flow separation control around the inclined flat plate by plasma actuator in subsonic flow. The plasma actuator mounted at the leading edge of the flat plate can prevent the flow separation and make the flow fully attach to the upside surface at the angles of attack near the stall point, and can decrease the width of the recirculation flow region at large angles of attack. The experiments with five different arranged electrodes indicated that it is more efficient to control the flow separation with larger negative electrode width and spacing between the adjacent edges of the electrodes, if the voltage and frequency of the input power source are constants. Finally, the suction and acceleration effects of the plasma actuator on the surrounding air were confirmed by flow visualization, and the mechanism of flow separation control by plasma actuator was discussed.