深海立管顺流与横流耦合涡激振动中的内流效应分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (19) : 7-13.

论文

赵桂欣1，孟帅1，车驰东1，赵创业2，张文龙2

作者信息 +

Internal flow effect in IL-CF coupled VIV of deep-sea risers

ZHAO Guixin1, MENG Shuai1, CHE Chidong1, ZHAO Chuangye2, ZHANG Wenlong2

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文章历史 +

摘要

深海立管因长径比大幅增加导致柔性增强、内流效应凸显，其在顺流和横流耦合涡激振动中的内流效应尚未得到很好理解。采用半经验时域涡激振动水动力模型，建立深海立管在均匀洋流下的横向和纵向耦合振动方程，并利用有限元法求解，探究不同内流速度、内流密度和洋流下立管在顺流和横流耦合涡激振动中的内流效应。研究发现，当洋流速度和内流密度一定时，（1）内流效应可使系统固有频率降低，因此随着内流速度增加，顺流和横流涡激主导频率可能脱离激励区，主导模态转移到高阶，同时主导频率发生阶跃增加；（2）立管横向位移均方根最大值是增加还是减少取决于横向涡激主导频率是接近还是远离涡脱频率；（3）当横流向涡激振动主导模态不变时，由于内流效应可以降低系统刚度，顺流向的静态位移随着内流速度的增加而逐步增加。当横流向主导模态转移至高阶时，顺流向的曳力系数会发生突然减少导致静态位移呈现阶跃性下降。（4）内流效应对顺流向振动有着不可忽略的影响。立管顺流向振动响应是内流效应、拖曳力（受横流向涡激响应影响）和顺流向涡激流体力联合作用的结果。

Abstract

With the great increase of aspect ratio, the flexibility of a deep-water marine riser is enhanced and IFE (Internal Flow Effect) becomes remarkable inevitably. However, the IFE on the coupled IL (In-line) and CF (Cross-Flow) VIV (Vortex-Induced Vibration) of deep-water marine risers has not been well understood. The dynamic motion equations of a flexible riser subject to an incoming current is established, in which a semi-empirical VIV hydrodynamic model is employed. The VIV responses of a flexible riser at different internal flow velocities, internal flow densities and current velocities are examined. It has demonstrated that (1) the internal flow induced centrifugal force can decrease the natural frequencies. With the increase of internal flow velocity, the CF/IL dominant excitation frequency can leave the excitation region. Then the CF/IL dominant mode transfers to a higher order companied by a jump increase of the dominant frequency. (2) Whether the maximum value of the CF RMS displacement is increased or decreased depends on whether the CF dominant frequency approaches or departs from the vortex shedding frequency; (3) The centrifugal force can decrease the system stiffness and the IL static deformation increases with the increase of internal flow velocity. Once the CF dominant mode switch occurs, the static deformation has a jump decrease ascribed to the sudden reduction of the drag coefficient. (4) The IFE has a non-negligible effect on the IL dynamic response, which is affected by the resultant effects of the internal flow, the drag force (depending on the CF VIV response) and IL vortex shedding force.

导出引用

赵桂欣1，孟帅1，车驰东1，赵创业2，张文龙2. 深海立管顺流与横流耦合涡激振动中的内流效应分析[J]. 振动与冲击, 2023, 42(19): 7-13

ZHAO Guixin1, MENG Shuai1, CHE Chidong1, ZHAO Chuangye2, ZHANG Wenlong2. Internal flow effect in IL-CF coupled VIV of deep-sea risers[J]. Journal of Vibration and Shock, 2023, 42(19): 7-13

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