Experimental investigation on the vortex-induced vibration of a three-riser group coupling interference effect
Experimental investigation on the vortex-induced vibration of a three-riser group coupling interference effect
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三立管群耦合干涉效应涡激振动实验研究
DOI：
10.1016/j.jsv.2020.115740
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发表时间：
2021-01
影响因子：
4.7
通讯作者：
Lou Min
中科院分区：
文献类型：
--
作者：
Wang Yu;Li Peng;Liu Yu;Guo Haiyan;Lou Min
以“立管群结构-立管间流体”为载体，以“三立管系统”为研究对象，进行了立管群与来流间夹角为0°、30°、45°、60°、90°的三立管群耦合干扰效应的涡激振动实验。相邻立管的间距为直径的4倍，外部流量在0.1~0.6微米/S范围内变化。基于光纤布拉格光栅传感器测得的应变和振型分解理论，引入“频率干扰比”和“位移干扰效率”的概念，分析了立管群在不同入射角下的动态特性和动力响应演化。探讨了当发生模态竞争时沿立管位移的相关性，并研究了外流与尾流、缝隙流耦合对结构的非线性影响。结果表明，在0°和30°角处，尾迹遮挡效应是中下游立管的主要制约因素，导致0°处中下游立管的Strouhal数逐渐减小，主频突然降低。边界效应主要体现在45°、60°和90°三组立管上，增加了振动频率。尾迹和缝隙流对变角度提升管群的干扰作用导致模式转换强度不同，45°提升管群振动轨迹的偏转导致两个方向的位移趋于一致。最重要的是，以Strouhal数为代表的主频和以行波特性为代表的位移模转变都在60°处达到最大值。频率干扰比和位移干扰效率并不完全一致，顺流和错流方向的干扰效果存在明显差异。对于变角度立管群，高速下的横流位移是工程设计中必须考虑的问题，其对低速立管群的干扰作用也是不可忽视的。
The “riser group structure—fluid between risers” is taken as the carrier, and the “three-riser system” is selected as the research object, the experiment on the vortex-induced vibration of a three-riser group coupling interference effect is performed with variable angles between the riser group and the incoming flow, and the angles are 0°, 30°, 45°, 60° and 90°. Adjacent risers are arranged at the spacing of 4 times the diameter, and the external flow changes within 0.1–0.6 m/s. Based on the strains obtained by the fiber Bragg grating sensors and the modal decomposition theory, the concepts of “frequency interference ratio” and “displacement interference efficiency” are introduced to analyze the dynamic characteristics and dynamic response evolutions of the riser group at different incidence angles. The correlation of displacement along the riser when modal competition occurs to risers is explored, and the nonlinear effect of the external flow coupled with the wake and gap flow on the structure is researched. The results indicate that the wake shadowing effect constitutes the main constraint of the midstream and downstream risers at angles 0° and 30°, which leads to the gradual reduction of the Strouhal numbers and the sudden reduction in the dominant frequencies of the midstream and downstream risers at 0°. The boundary effect is mainly reflected in the 45°-, 60°-, and 90°-riser groups, which increases the vibration frequency. The interference effect of wake and gap flow on the variable-angle riser group causes the intensity of the mode transition to be different, and the deflection of the vibration trajectory in the 45°-riser group causes the displacements in both directions to approach. Crucially, the dominant frequencies represented by the Strouhal numbers peak, and the displacement mode transition represented by the traveling wave characteristic maximize both at 60°. The frequency interference ratio and displacement interference efficiency are not exactly consistent, and the interference effects in the in-line and cross-flow directions are significantly different. For a variable-angle riser group, cross-flow displacement under high velocities would be the key consideration in engineering design, and its interference effect on the riser group at low velocities is not negligible, either.
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