等离子体激励参数对圆柱绕流影响的风洞实验研究

为研究等离子体的激励参数对圆柱绕流的影响,在低速风洞中进行介质阻挡放电(DBD)等离子体激励控制圆柱绕流的实验。风速V_∞=8 m/s,基于圆柱直径的雷诺数Re=8.6×10~4。圆柱绕流的烟线流动显示、圆柱壁面和尾迹压力的测量和分析表明脉冲激励参数的变化对圆柱绕流的影响在尾流宽度、壁面静压分布、圆柱阻力、尾迹压力分布三方面均有所体现。激励频率在400 Hz左右时流动控制效果最佳。占空比在40%~80%范围内,流动控制效果较好。激励电压在9.2~13.2 kV区间内存在放电启动的临界电压值,在22~25.5 k V范围内激励效果最优。边界层分离点附近区域,激励对壁面静压和流速的影响较为显著。

Influence of plasma actuation parameters on the flow around a circular cylinder by a wind tunnel experiment

Dielectric barrier discharge (DBD) plasma actuators were used to control the ?ow around a circular cylinder at Re=8.6 104 in a low-speed wind tunnel. The Smoke-wire visualization was conducted. The pressure, which closed to the wall and in the wake, reacted to the change of actuation parameters such as frequency, voltage and duty ratio. It was shown that the optimal numerical range is about 400 Hz for frequency, 40% to 80% for duty ratio, and 22 KV to 25.5 KV for voltage, respectively. The critical voltage for spark-over was between 9.2 KV and 13.2 KV. And it was more notable near the boundary layer separation point that actuation influenced static pressure and velocity of flow.