内流作用下深海扬矿硬管流固耦合振动特性数值仿真研究
Numerical simulation research on the fluid-solid coupling characteristics of the lifting pipe under the influence of internal fluid
田石磊 1陈科 1尤云祥1
作者信息
- 1. 上海交通大学海洋工程国家重点实验室,上海 200240;上海交通大学三亚崖州湾深海科技研究,三亚 572000
- 折叠
摘要
为研究内流作用下扬矿硬管的振动特性,根据相似理论建立包括扬矿硬管、中间仓、内部流场在内的流固耦合有限元模型,计算了扬矿管在内流场作用下的模态频率,并根据计算结果进行谐响应分析;探究了壁厚、内径、恒定内流流速、不同频率与幅值的脉动内流流速对扬矿管系统振动特性特别是共振行为的影响.结果表明:恒定内流流速下,扬矿管振动位移的频率与其振幅最大的共振频率(12阶固有频率)相一致,主要表现为纵向振动.距中间仓10％管长范围内,扬矿管的振动幅值变化低于5％.相对于保持壁厚不变调整内径,保持内径不变调整壁厚对扬矿管共振行为的抑制作用更为显著.脉动内流幅值大于0.5 m/s时,扬矿管的最大振动位移与等效应力接近线性增长.随着脉动内流频率的增加,存在以12阶固有频率为中心、区间长度为8 Hz的共振带,在共振带内,扬矿管的最大等效应力出现在顶端,沿水深方向逐渐减小.
Abstract
In order to research the vibration characteristics of the lifting pipe under the effect of internal flow,the fluid-solid coupling finite element model including the lifting pipe,the intermediate warehouse and the internal flow field is established according to the similarity theory,and the modal frequency of the lifting pipe under the effect of the internal flow field is calculated,and the harmonic response analysis carried out according to the cal-culation results.The effects of wall thickness,inner diameter,constant internal flow velocity,pulsating internal flow velocity with different frequencies and amplitudes on the vibration characteristics,especially the resonance behavior of the lifting pipe system are investigated.The results show that the frequency of the vibration displace-ment of the lifting pipe is consistent with the resonance frequency(12th order natural frequency)with the largest amplitude at a constant internal flow velocity,and the vibration is mainly longitudinal.Within 10％of the pipe length near the intermediate warehouse,the change in vibration amplitude of the lifting pipe is less than 5％.Compared with adjusting the inner diameter while keeping the wall thickness unchanged,adjusting the wall thickness while keeping the inner diameter unchanged has a more significant inhibition effect on the resonance behavior of the lifting pipe.When the amplitude of pulsating internal flow is greater than 0.5 m/s,the maximum vibration displacement and equivalent stress of the lifting pipe increase linearly.With the increase of the frequen-cy of pulsating internal flow,there is a resonance band with a width of 8 Hz centered on the 12th order natural frequency.Within the resonance band,the maximum equivalent stress of the lifting pipe appears at the top and gradually decreases along the water depth direction.
关键词
扬矿硬管/流固耦合/共振响应/有限元分析Key words
lifting pipe/fluid-structure interaction/resonance response/finite element analysis引用本文复制引用
基金项目
海南省自然科学基金项目(2021JJLH0094)
出版年
2024
NETL
NSTL
万方数据