不同流场下含内流立管涡激振动响应特性及Coriolis力效应研究  

Vortex-induced vibration response characteristics and Coriolis force effect of riser with internal flow under different flow fields

作　　者：李星辉 袁昱超 薛鸿祥[1,2] 唐文勇[1,2] LI Xinghui;YUAN Yuchao;XUE Hongxiang;TANG Wenyong(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《振动与冲击》2023年第3期165-173,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51909163,51979166)。

摘　　要：细长结构物在海洋来流作用下会发生涡激振动(vortex-induced vibration, VIV),涡激振动是海洋立管疲劳损伤的主要诱因之一。立管实际工作过程中内部输送油气,产生惯性力、科氏力(Coriolis力)和离心力,使得立管的动力响应变得更为复杂。基于含内流立管涡激振动响应时域预报模型,分别计算了在均匀流和剪切流下含内流立管涡激振动响应,并分析了机理较为复杂的科氏力作用。结果表明:均匀外流下内流会降低立管的固有频率,增大响应幅值;剪切外流下内流会激发出更高阶的模态响应。均匀外流下,科氏力在一定区域内固定做正功或负功,分别引起均方根位移的增大或减小;剪切外流下,科氏力使得立管顶部区域均方根位移升高,中部区域均方根位移降低。内流速度越大,科氏力效应越显著。Vortex-induced vibration(VIV) occurring in slender structures under action of ocean current is one of main causes of fatigue damage of marine riser. In actual working process of risers, oil and gas were transported internally to cause inertial force, Coriolis force and centrifugal force, and make riser dynamic response more complex. Based on the time-domain prediction model of VIV response of riser with internal flow, VIV responses of riser with internal flow under uniform flow and shear flow were calculated, respectively, and Coriolis force action with more complex mechanism was analyzed. The results showed that internal flow under uniform external flow can reduce natural frequencies of riser and increase its response amplitude;higher order modal response can be excited by internal flow under shear external flow;under uniform external flow, Coriolis force can do positive work or negative work within a certain area to make root mean square displacement increase or decrease, respectively;under shear external flow, Coriolis force can make root mean square displacement in riser top area increase and that in riser middle area decrease;the larger the internal flow velocity, the more significant the Coriolis force effect.

关 键 词：内流 涡激振动(VIV) 顶张式立管 科氏力 时域模型 

分 类 号：P756.2[天文地球—海洋科学]