当前位置: X-MOL 学术J. Sound Vib. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental investigation on the vortex-induced vibration of a three-riser group coupling interference effect
Journal of Sound and Vibration ( IF 4.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jsv.2020.115740
Yu Wang , Peng Li , Yu Liu , Haiyan Guo , Min Lou

Abstract 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 0.1-0.6m/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.

中文翻译:

三立管组耦合干涉效应涡激振动的实验研究

摘要 以“立管组结构——立管间流体”为载体,选择“三立管系统”为研究对象,对三立管组耦合干涉效应的涡激振动实验进行了实验研究。立管组与进流夹角可变,角度为0°、30°、45°、60°和90°。相邻的立管以4倍直径的间距排列,外流在0.1-0.6m/s内变化。基于光纤布拉格光栅传感器获得的应变和模态分解理论,引入“频率干扰比”和“位移干扰效率”的概念,分析了不同入射角下立管组的动态特性和动态响应演化. 探讨了立管发生模态竞争时沿立管位移的相关性,研究了外流耦合尾流和间隙流对结构的非线性影响。结果表明,尾影效应构成了0°和30°角的中下游立管的主要约束条件,导致Strouhal数逐渐减小,中下游立管的主导频率突然降低。在 0°。边界效应主要体现在45°-、60°-和90°-立管组,增加了振动频率。尾流和间隙流对变角立管组的干扰作用导致模态跃迁强度不同,45°立管组振动轨迹的偏转导致两个方向的位移接近。至关重要的是,由 Strouhal 数峰值表示的主要频率和由行波特性表示的位移模式转变都在 60° 处最大化。频率干扰比和位移干扰效率并不完全一致,在同向和错流方向上的干扰效果明显不同。对于变角隔水管组,高流速下的错流位移将是工程设计的重点,其对低速下隔水管组的干扰影响也不容忽视。Strouhal 数峰值代表的主要频率和行波特性代表的位移模式转变都在 60° 处最大化。频率干扰比和位移干扰效率并不完全一致,在同向和错流方向上的干扰效果明显不同。对于变角隔水管组,高流速下的错流位移将是工程设计的重点,其对低速下隔水管组的干扰影响也不容忽视。Strouhal 数峰值代表的主要频率和行波特性代表的位移模式转变都在 60° 处最大化。频率干扰比和位移干扰效率并不完全一致,在同向和错流方向上的干扰效果明显不同。对于变角隔水管组,高流速下的错流位移将是工程设计的重点,其对低速下隔水管组的干扰影响也不容忽视。并且在同向和错流方向上的干扰效应显着不同。对于变角隔水管组,高流速下的错流位移将是工程设计的重点,其对低速下隔水管组的干扰影响也不容忽视。并且在同向和错流方向上的干扰效应显着不同。对于变角隔水管组,高流速下的错流位移将是工程设计的重点,其对低速下隔水管组的干扰影响也不容忽视。
更新日期:2021-01-01
down
wechat
bug