| 睢娟,王嘉松*,田启龙,梁盛平.绒毛控制圆柱涡激振动的风洞试验研究[J].实验力学,2016,31(3):393~398 |
| 绒毛控制圆柱涡激振动的风洞试验研究 |
| On the Wind Tunnel Experiment of Cylinder Vortex Induced Vibration by Fluff Controlling |
| 投稿时间：2015-08-09 修订日期：2016-01-11 |
| DOI：10.7520/1001-4888-15-134 |
| 中文关键词: 圆柱 涡激振动 绒毛 振动抑制 |
| 英文关键词:bare cylinder vortex induced vibration fluff vibration suppression |
| 基金项目:国家自然科学基金(11372188)资助项目 |
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| 中文摘要: |
| 利用绒毛对圆柱涡激振动抑制进行了风洞试验研究。通过改变附属绒毛无因次长度L/D比(L为绒毛长度，D为圆柱外径)，研究L/D分别为0.6、1.2和1.8的模型在约化速度2~40的范围内对弹性支撑大质量阻尼系数圆柱涡激振动的抑制作用。试验采用激光位移传感器采集圆柱的横向(Y)和顺流向(X)位移，并用烟线测流场以揭示流动控制机理。结果表明，三种无因次长度的绒毛对大质量阻尼系数圆柱的涡激振动都有显著的抑制作用，随着L/D的增加，圆柱Y向无因次位移及功率谱密度幅值减弱，多达73.5%的无因次位移被抑制；且随着L/D的增加，圆柱附属绒毛频率比远离原始圆柱频率比。绒毛改变了圆柱的边界层分离点位置、抑制了边界层的相互作用并改变尾涡结构，从而抑制振动。 |
| 英文摘要: |
| Wind tunnel experiment was carried out to study the cylunder vortex induced vibration (VIV) by using fluff. Through changing the dimensionless length ratio of L/D (L is the length of the fluff and D the outer diameter of the cylinder), the effect of L/D (taken as 0.6, 1.2 and 1.8 respectively) on the vortex induced vibration suppression of a elastically supported cylinder with large mass damping coefficient m\+*ζ=1.415 was experimentally studied under the condition of reduced velocity is within range 2 to 40. In experiment, the transverse displacement (Y) and the flow direction displacement (X) of the cylinder were collected by laser displacement transducers, and the flow control mechanism was visualised by smoke-trace technique. Results show that the fluff with 3 different dimensionless length ratios all present obvious vortex induced vibration suppression efficiency for cylinder with large mass damping coefficient; along with the increase of L/D, the root-mean-square (RMS) response and the amplitude of power spectral density (PSD) decrease, the RMS response amplitude can be suppressed as high as 73.5% along transverse direction, the frequency ratio of fluff is far from that of bare cylinder. Fluff changes the position of cylinder boundary layer separation point and trailling vortex structure, restrains the boundary interaction, then suppresses the vortex induced vibration. |
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