摘要
基于先前的引入几何扰动来干扰结构尾迹中脱落涡从而实现涡激振动抑制的研究，本文的研究对象是带有圆锥型涡激振动抑制罩的圆柱体。通过数值模拟固定结构的绕流流场，研究结构受到的水动力载荷变化，并对其进行频谱分析。计算参数：Re数为100和1000；扰动波长为4，6和8；扰动强度（扰动波高与扰动波长之比）为0．0125，0．025，0．05，0．1和0．2。一般地，引入圆锥型抑制罩后，平均阻力系数随着扰动强度增大而增大，而脉动升力系数的变化则较复杂。多数情况下，圆锥型柱体阻力都较直圆柱的大，而升力则显著减小。值得注意的是，存在升、阻力同时都减小的情况。
Based on previous works, in which geometric disturbance was introduced to interrupt vortex shedding in structural wake and suppression of vortex-induced vibration could be realized, the object of present paper is circular cylinder with conic shroud for VIV suppression. Through numerical simulation of fluid flow past a fixed structure, variation of hydrodynamic load and frequency spectrum are studied. Computational parameters are： Re of 100 and 1000, disturbed wavelength of 4, 6 and 8, and the wavy steepness, defined by the ratio of the wave height to the wavelength, of 0.0125, 0.025, 0.05, 0.1 and 0.2. Generally, the introduction of conic shroud leads to the increase of mean drag coefficient with the increase of wavy steepness, while RMS lift coefficient varies complicated. In most cases, drag of conic cylinder is greater than that of straight cylinder, while lift is significantly reduced. It is noticed that there is a situation where both drag and lift are reduced at the same time.
出处
《中国造船》
EI
CSCD
北大核心
2013年第A02期186-191,共6页
Shipbuilding of China
关键词
圆锥型扰动
涡激振动
抑制
水动力载荷
conic disturbance
vortex-induced vibration
suppression
hydrodynamic load
