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为揭示端壁等离子体气动激励抑制高负荷压气机叶栅角区流动分离的影响规律和流场特征,在不同流场参数和激励条件下分别开展了微秒脉冲和纳秒脉冲等离子体气动激励抑制叶栅流动分离的实验研究.结果表明:端壁等离子体气动激励可以有效抑制叶栅角区的流动分离,其作用效果在攻角为3°时最佳,随攻角的增大逐渐下降;微秒脉冲激励的流动控制效果随来流速度的增大而降低,随激励电压和占空比的增大而提高,最佳非定常脉冲频率为500Hz;在较高来流速度下,微秒脉冲激励的作用效果十分微弱,但纳秒脉冲激励能够有效抑制角区流动分离;纳秒脉冲激励的流动控制效果随激励电压增大而提高,激励频率对控制效果至关重要,作用效果随激励频率的增大而不断增强,但当激励频率为5kHz时,作用效果有所下降.
In order to reveal the influence laws and flow field characteristics of the endwall plasma aerodynamic excitation to suppress the flow separation in the high load compressor cascade, the microsecond pulse and the nanosecond pulsed plasma aerodynamic actuation were carried out under different flow field parameters and excitation conditions The experimental results show that the aerodynamic excitation of the endwall plasma can effectively restrain the flow separation in the cascades and the effect is best when the angle of attack is 3 ° and gradually decrease with the increase of the angle of attack The flow control effect of microsecond pulse excitation decreases with the increase of the flow velocity and increases with the increase of excitation voltage and duty cycle. The optimum unsteady pulse frequency is 500 Hz. At the higher flow velocity, The effect of the second pulse excitation is very weak, but the nanosecond pulse excitation can effectively restrain the angular separation; the flow control effect of nanosecond pulse excitation increases with the excitation voltage, and the excitation frequency is very important to the control effect. Excitation frequency increases and continues to increase, but when the excitation frequency is 5kHz, the effect is reduced.