子母管结构中海缆涡激振动特性研究  

Research on vortex induced vibration of cable in piggy-back configuration

作　　者：潘盼 蔡炳余 谭爱林 郭朝阳 谢书鸿 

机构地区：[1]中天科技海缆有限公司,江苏南通226010

出　　处：《海洋工程》2015年第6期45-51,共7页The Ocean Engineering

基　　金：国家高技术研究发展计划(863计划)(2012AA09A401)

摘　　要：采用流固耦合分析方法,对某海洋石油开采项目采用的子母管结构进行涡激振动特性研究,并与相同海缆在自由悬跨状态下振动特性进行比较。数值仿真结果显示,受母管影响,子母管中海缆由于涡街效应产生的升力振幅随时间变化不一致,而单根海缆升力幅值稳定;子母管中海缆产生的拖曳力高出单根海缆65%,振动幅值加大,并且沿整根海缆尾流中湍动能分布呈现随机性,导致水动力沿整根海缆分布不均匀。提取海缆升力与垂直水流方向振幅进行比较,发现涡激升力是导致垂直方向振动的主要原因。子母管中海缆在水流阻力和涡激升力共同作用下产生较大的位移和应变,应进一步调整夹具间距和剩余张力来减缓海缆疲劳损伤。The vortex-induced vibration characteristic of the piggy-back configuration adopted in the oil production was studied with the FSI method, and the results were compared with the single cable vibration under free span condition. The numerical simulation revealed that the amplitude of the lift force caused by the vortex street of the secondary cable varied over time due to the main pipe＇ s influence, but the lift force of the single cable was constant. The drag force of the cable in piggy-back was about 65% higher than the single cable with larger amplitude, and the turbulent kinetic energy in the wake along the cable showed random feature, thereby impacted the hydrodynamic force. By comparing the lift force and amplitude of the vibration perpendicular to the flow direction of the middle section of the cable, it revealed that the lift force due to vortex was the main reason for vertical vibration. The flow drag force combined with the vortex induced lift caused significant displacement and strain of the cable, and much effort must be taken to adjust the interval of the clamps and residual tension to relieve the fatigue damage of the cable in the piggy-back configuration.

关 键 词：子母管 涡激振动 自由悬跨 流固耦合 湍流动能 

分 类 号：P754[天文地球—海洋科学]