浮力筒自由涡激运动的模型试验研究

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摘要

本文对外径150mm，长700mm垂直放置的浮力筒模型开展了自由涡激运动试验研究，测量了浮力筒在不同试验工况下六个自由度的运动参数，并着重对浮力筒顺流向、横向和艏摇运动的运动特性进行了分析。试验中发现，当约化速度较小时浮力筒主要发生顺流向运动而横向和艏摇运动较小且不规则；当约化速度增大到一定程度后，顺流向运动频率是横向运动频率的2倍，此时艏摇运动出现了两个主要运动频率，其中较大的艏摇运动频率等于横向运动频率，因此认为横向运动和艏摇运动的激励力来源相同，即二者存在耦合作用，而且浮力筒的运动轨迹呈现明显的“8”字形。试验中还发现，浮力筒涡激运动的平均拖曳力系数比圆柱绕流的阻力系数增大了约100%。

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	康庄 1
	李平 1

关键词 ：浮力筒；涡激运动；模型试验；&ldquo')" href="#">

浮力筒；涡激运动；模型试验；&ldquo, 8&rdquo, 字形

Abstract：This paper makes experimental studies on the vortex-induced motion response of a free vibration buoyancy can. The buoyancy can was put vertically, with the diameter of 150mm and the length of 700mm. The model test could measure motion parameters of 6-DOF under different work condition and analyse motion responses of the cross-flow, in-line and yaw direction. The results indicated that the motion frequency of in-line was twice as big as that of cross-flow and the trajectory of the cylinder was obviously in “8”shape when the reduced velocity became large. Then, the yaw motion frequency was single under the small reduced velocity and when reduced velocity got larger it appeared two frequencies, both increase as the reduced velocity increases, and the larger yaw motion frequency was equal to the CF frequency, so the excitation sources of CF motion and yaw motion were the same, namely coupling effect. It was also found that the mean drag coefficient of VIM was about 100% more than the circular cylinder.

Key words： buoyancy can VIM model test “8”shape

收稿日期: 2016-04-07 出版日期: 2017-07-15

引用本文:

康庄 1,李平 1. 浮力筒自由涡激运动的模型试验研究[J]. 振动与冲击, 2017, 36(14): 9-18.
Kang Zhuang1，Li Ping1. A Model Test Investigation on Vortex-induced Motions of the Buoyancy Can. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(14): 9-18.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I14/9

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