Suppression of vortex induced oscillation of a rectangular cylinder by sound

流场中受弹簧支承的矩形柱体遇到涡激振动。在这项研究中，涡激振荡试图用声音来抑制。在矩形柱体的前缘处发出声音，频率高达300 Hz且具有足够声压的声音可以抑制振荡，由活塞产生的低频抽吸和吹扫代替声音。10 Hz以上的吸、吹气对抑制作用较强。用接近流动的动压代替活塞吹气。该方法仅对旋涡振荡的平移运动产生抑制作用，流量测量试验表明，声推进了分离流的转捩，使分离气泡收缩。非定常压力的测量表明，声具有减小表面压力幅值的作用。

A rectangular cylinder supported by spring in a flow meets vortex induced oscillation. In this study the vortex excited oscillation is tried to be suppressed by sound. The sound is emitted at the leading edges of the rectangular cylinder.The sound whose frequency was up to 300 Hz and having sufficient sound pressure could suppress the oscillation.The low frequency suction and blowing produced by a piston was applied instead of sound. The suction and blowing above 10 Hz had suppression effect. The dynamic pressure by approaching flow was used instead of piston blowing. In this method the suppression effect was appeared only translation motion of vortex oscillation.The flow measurement test showed that the sound progressed the transition of separated flow and shrunk the separated bubble. The measurement of unsteady pressure showed that the sound had the effect of reducing the amplitude of surface pressure.