振荡流下柔性立管涡激振动时域响应研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (13) : 56-64.

论文

振荡流下柔性立管涡激振动时域响应研究

袁昱超1,2，薛鸿祥1,2，唐文勇1,2

作者信息 +

Vortex-induced vibration time domain responses of flexible risers under oscillatory flows

YUAN Yu-chao1,2， XUE Hong-xiang1,2， TANG Wen-yong1,2

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摘要

本文引入受迫振动试验所得流体力系数库，采用全新的锁定判定区间及锁定准则，针对柔性立管振荡流条件下涡激振动问题提出了一套可供选择的时域预报数值方法。涡激振动流体力由瞬时来流速度及立管截面运动共同决定，相关流体力系数为无因次幅值及频率的函数。基于上述方法对某4m立管模型不同KC数及最大约化速度的振荡流工况进行模拟，预报结果与相应试验实测吻合较好，并捕捉到振幅调制、迟滞、频率转换及高频谐振等现象。进而，对于不同KC数及最大约化速度组合的振荡流工况下立管动力响应表现出的诸多有别于定常流条件的特性，从涡激振动发生机理层面进行分析讨论并给出合理解释。最后，通过对振荡流与均匀流下立管涡激振动响应进行对比发现，在流速相当的条件下，振荡流工况的涡激振动均方根位移大于对应均匀流工况的对应值；而当最大约化速度相同时，较小的KC数对应较大的涡激振动均方根位移。

Abstract

Introducing the hydrodynamic force coefficient database obtained with forced vibration tests and adopting the full-new judgement for lock-in region and the lock-in criterion, aiming at vortex-induced vibration (VIV) problems of flexible risers under oscillatory flows, a set of time domain predicting numerical methods for users to choose was proposed. VIV hydrodynamic forces were depended on instantaneous incoming flow velocity and motion of riser’s cross-section. The corresponding hydrodynamic force coefficients were functions of non-dimensional amplitude and frequency. Based on the proposed methods, the dynamic response of a certain 4m high riser model under oscillatory flows with different KC numbers and maximum reduced velocities was calculated. The prediction results agreed well with those of tests. Amplitude modulation, hysteresis, frequency transition and higher frequency resonances, etc. phenomena were observed in the predicted results. These features of the dynamic response of the riser under combined oscillatory flow cases with different KC numbers and maximum reduced velocities were distinguished from those under steady flow cases. They were analyzed from the view point of VIV occurrence mechanism and explained reasonably. Finally, comparing VIV responses of the riser under oscillatory flows with those under uniform flows, it was shown that under the similar flow velocity, the RMS of riser’s VIV displacement under oscillatory flows is larger than that under uniform flows; under the same maximum reduced velocity, the smaller KC number corresponds to a larger RMS of riser’s VIV displacement.

关键词

涡激振荡 / 柔性立管 / 振荡流 / 数值模拟 / 时域

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袁昱超1,2，薛鸿祥1,2，唐文勇1,2. 振荡流下柔性立管涡激振动时域响应研究[J]. 振动与冲击, 2018, 37(13): 56-64

YUAN Yu-chao1,2， XUE Hong-xiang1,2， TANG Wen-yong1,2. Vortex-induced vibration time domain responses of flexible risers under oscillatory flows[J]. Journal of Vibration and Shock, 2018, 37(13): 56-64

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