不同端板条件下的圆柱涡激振动试验
Experimental Research on Vortex-Induced Vibration of Circular Cylinders with Different Endplates

以涡激振动海流能利用为工程背景，在流速范围为0~0.75m/s的自循环水槽中开展了直径为6cm的单自由度圆柱涡激振动试验研究，分析了5种不同形状端板、7种不同尺寸矩形端板条件下圆柱涡激振动的响应规律，提出了适用于能量利用的端板形状与合理尺寸。研究结果表明：5种端板中最有利于能量利用的为矩形端板，最不利的为端板；矩形端板圆柱的振幅和频率为端板圆柱的1.38倍与1.25倍；利于增强振动的矩形端板顺水流方向长度应控制在1.5~2倍圆柱直径范围内。
In the present studies on the current energy extracting from vortex-induced vibration (VIV), most physical models are simplified as 2D circular cylinder, few of them analyzed the 3D effects of the endplates. In this study, the VIV tests of single-DOF circular cylinder with 6cm diameter are conducted in the circular tunnel with the velocity changing from 0 to 0.75m/s. Five endplates with different shapes and seven rectangular endplates with different lengths are considered. Based on the test results, the optimal shape and optimal size of endplate for the energy extracting are investigated. The main conclusions are listed as follows: The optimal shape is rectangular, and the unfavorable one is no endplate; The amplitude and frequency of the cylinder with rectangular endplate are 1.38 times and 1.25 times of that with no endplate cylinder respectively; The length of endplate on the in line direction (the flow direction) should be controlled in the range of 1.5 to 2 times the diameter of the cylinder to enhance the vibration.