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实验研究了声激励对高速外流下矩形空腔振荡流动的抑制效应。实验发现了空腔流激振荡的主导模态随来流速度的敏感变化现象。通过在空腔前缘加纯音声激励，在Ｍ≤０．６的情况下取得了较好的抑制振荡效果。测量了腔口自由剪切层的平均速度型及速度脉动频谱，证实了前缘声激励对自由剪切层内不稳定波的激发作用，探讨了空腔振荡机理及声激励抑制机理。
The inhibitory effect of acoustic excitation on the oscillation of rectangular cavity under high velocity outflow was experimentally studied. The experiment found that the dominant mode of cavity flow oscillation with the flow velocity of the sensitive changes. By adding pure acoustic excitation at the leading edge of the cavity, the better vibration suppression effect is obtained under M≤0.6. The average velocity type and velocity pulsation spectrum of the free shear layer in the cavity were measured. The excitation of the unsteady wave in the free shear layer by the leading edge excitation was confirmed. The cavity oscillation mechanism and the mechanism of acoustic excitation inhibition were discussed.