不同时间尺度等离子体气动激励特性的测试诊断

为了揭示ns脉冲等离子体气动激励与流场附面层耦合作用机制,提高等离子体气动激励控制附面层的能力,对不同时间尺度的等离子体气动激励的放电特性和体积力等进行了测试诊断。实验结果表明:ms、μs、ns脉冲放电的放电电压相差不大,但ns脉冲的最大放电电流明显高于ms和μs脉冲,最高可达到4 A;激励电压越大,等离子体气动激励诱导体积力越大;ms、μs脉冲等离子体气动激励诱导体积力水平方向分量较大,ns脉冲水平方向体积力近似为零;ns脉冲垂直方向体积力不为零,与ms和μs脉冲相差较小。

Diagnosis Investigations of Plasma Aerodynamic Actuation Characteristics of Different Time Scales

In order to reveal the mechanism of nanosecond pulse plasma flow control and then enhance the boundary layer control ability of plasma aerodynamic actuation, the electric characteristic and the body force of plasma aerodynamic actuation of different time scales are diagnosed experimentally. The results indicate that the inceptive discharge voltages for microsecond, millisecond and nanosecond pulse actuation are nearly the same, but the maximum discharging current of nanosecond pulse actuation is 4 A, which is much higher than that of the microsecond and of the millisecond. The body force will increase with the rise of the actuation voltage; the differences of the vertical components of the body force induced by plasma aerodynamic actuation of different time scales are little, but the horizontal components induced by millisecond and microsecond actuation are greater.