Suppression of vortex induced oscillation of a rectangular cylinder by sound

在流动中，由弹簧支撑的矩形圆柱体遇到涡激振荡。本研究尝试用声音来抑制旋涡激振。声音从矩形圆柱体的前缘发出。频率高达300hz且声压足够的声音可以抑制振荡。用活塞产生的低频吸气和吹气代替声音。10 Hz以上的吸、吹气均有抑制作用。采用接近流动压法代替活塞吹气。该方法只对旋涡振荡的平移运动产生抑制作用。流量测量试验表明，声音推进了分离流的过渡，缩小了分离泡。对非定常压力的测量表明，声音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.