吸气作用下圆柱涡激振动特性试验研究

Experimental research on properties of vortex-induced vibration for cylinders with suction

为研究吸气对圆柱涡激振动的控制效果,采用吸气控制方式,选取不同的来流风速、吸气速度和吸气角度进行风洞试验.通过在风洞中使用质量阻尼系统使圆柱发生涡激振动,并对比控制效果.研究结果表明:定常吸气对涡激振动临界风速、涡激振动锁定区间长度以及降涡激振动的幅值都有影响;当吸气角度为0°,45°或180°时,吸气对涡激振动有很好的控制效果;当吸气角度为90°或135°时,控制效果最显著;吸气系数对控制效果也有一定影响.通过分析圆柱表面风压特性可知:吸气控制对流场既有稳定作用,又有扰动作用.当吸气流量比较小时,稳定作用占主导;随着吸气量增大,扰动作用越来越明显.

To study the suction control effect on vortex‐induced vibration （VIV） of cylinders ,steady suction method was employed to study the properties of VIV for the cylinder with different wind speed ,suction speed and suction angles by wind tunnel experiment in this paper .The VIV of the cir‐cular cylinder was first reproduced by using a spring‐mass system in the wind tunnel ,and the control results were compared .The results shows that steady suction has effects on the critical wind velocity , the length of the lock‐in region and vibration amplitude .The effects of control are good when the suc‐tion holes at 0°,45° or 180°.The most significant control effect can be obtained when the suction holes at 90°or 135° .Suction coefficient also affects the control performance .By analyzing the surface pressure distribution ,it is show n that the suction control has both stabilized and disturbed effects . When the suction flow is small ,the stabilized effect plays a leading role ,and w hen the flow is larger , the disturbed effect has more obvious influences .