等离子体气动激励诱导气流加速的实验

为揭示等离子体气动激励诱导气流加速的作用机理及影响因素,对静止空气条件下的诱导气流速度进行了测量.实验结果表明:等离子体气动激励启动瞬间形成启动涡,随即旋涡向下游运动并最终演化为近壁面射流;激励电压增大时,诱导气流速度增大,近壁面射流的射程增加;激励频率增大时,诱导气流速度变化不明显;多组电极激励器诱导的气流速度周期性地先增大后减小,并且诱导气流加速的效果沿流向方向逐渐减弱.

Experiment on the induced airflow acceleration by plasma aerodynamic actuation

To show the basic mechanism and the influencing factors of induced airflow acceleration by plasma aerodynamic actuation, the induced airflow velocities were measured while the ambient air was still. The experimental conclusion shows that a start-up vortex appears the instant plasma aerodynamic actuation motivates, then moves behind and finally evolves into jet stream close to the actuator surface; the induced airflow velocities and the range of the jet stream increase while the actuation voltage rises; the induced airflow velocity variation is not obvious while the actuation frequency rises; the airflow velocities induced by plasma actuator with more pairs of electrodes increase firstly and then decrease periodically, and the impact of induced airflow acceleration weakens gradually as the stream-wise location rises.