柔性分离盘抑制圆柱涡激振动的风洞试验

该文利用附属柔性分离盘对圆柱涡激振动(VIV)控制问题进行了风洞试验研究。针对弹性支撑的圆柱及不同长度柔性分离盘的试验模型,在雷诺数7 500-40 000情况下,测定不同约化速度(3.5-18.7)下的振动瞬态位移。结果表明:柔性分离盘长度(L)/圆柱直径(D)比为0.6、0.8和1三种圆柱的横向无因次均方根振幅远小于单圆柱,涡激振动抑制效果很好,均在77.6%以上,其中L=0.8D的圆柱抑制效果最佳,几乎无振动;而L=1.2D和1.5D的圆柱反而出现振动增强,约4.5%和9%。对比单圆柱的共振区,附属柔性分离盘的圆柱共振区在约化速度上更靠后且范围更大。

Wind tunnel experiment of VIV control on circular cylinder with flexible splitter plate

This paper performed a wind tunnel experiment on the suppression of vortex-induced vibration (VIV) for a circular cylinder with flexible splitter plates of five different lengths.The transient displacement of the flexibly mounted cylinders with flexible splitter plates at the Reynolds numbers from 7500 to 40000 (the reduced velocity is from 3.5 to 18.7)was measured.It shows that in the cross-flow direction the root-mean-square response amplitudes of cylinders with flexible splitter plates for the length of 0.6 D,0.8 D and 1 D,are far less than those of a bare cylinder.The suppression effects are all over 77.6％.The cylinder with flexible splitter plate of 0.8 D long scarcely vibrates,which has the best suppression effect.But the cylinders with 1.2 D and 1.5 D long plates vibrate more obviously with increasing amplitude about 4.5％ and 9％,respectively.Compared with the resonance region of bare cylinder,the resonance region of cylinders with flexible splitter plates appears later and larger towards the reduced velocity.