均匀流作用下柔性悬垂管涡激振动响应特性试验研究  

Experimental study on vortex-induced vibration of a flexible free-hanging pipe in uniform flow

作　　者：王靖[1,2,3,4] 许玉旺 任浩杰[1,2,3,4] 付雪鹏 付世晓 张萌萌 WANG Jing;XU Yu-wang;REN Hao-jie;FU Xue-peng;FU Shi-xiao;ZHANG Meng-meng(State Key Laboratory of Ocean Engineering,Institute of Marine Equipment,Shanghai Jiao Tong University,Shanghai 200240,China;School of Naval Architecture,Ocean&Civil Engineering,Institute of Marine Equipment,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Polar and Ocean Technology,Institute of Marine Equipment,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点试验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240 [3]上海交通大学极地深海技术研究院,上海200240 [4]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《船舶力学》2024年第9期1405-1419,共15页Journal of Ship Mechanics

基　　金：国家杰出青年科学基金资助项目(51825903);国家自然科学基金基础科学中心资助项目(52088102);自然科学基金联合基金资助项目(U19B2013);政府间国际科技创新合作重点专项(2018YFE0125100)。

摘　　要：温差能发电是近年海洋可再生能源研究的热点,悬垂取水管作为温差发电装置中提取深层冷海水的关键结构,其涡激振动响应特性尚不明确。本文开展了均匀流下悬垂管的涡激振动水池模型试验,利用光纤光栅应变传感器测量涡激振动应变响应,通过模态分析法、小波变换等数据处理方法研究悬垂管的幅值和频率特征。分析试验结果发现:均匀流作用下,悬垂管的涡激振动位移响应最大幅值主要位于悬垂管底部;柔性悬挂立管IL(in-line)和CF(cross-flow)主导频率基本满足二倍频关系,但是在模态转换的流速工况下会出现IL和CF方向主导频率相同的现象,同时伴随着明显的“行波”、“多频响应”以及“时间共享”特征;处理得到背景洋流作用下悬垂管的CF和IL方向斯特哈尔数分别为0.15和0.30,略小于以往两端铰支柔性立管试验结果,该值将为悬垂输水管涡激振动预报研究提供参数输入。Ocean thermal energy conversion is one of the research hotspots of marine renewable energy in recent years.Free-hanging water intake pipes are the key structure to extract deep cold seawater.At present,the vortex-induced vibration(VIV)response characteristics of free-hanging pipes in deep sea currents are not clear yet.In this paper,model tests of a free-hanging pipe under uniform flow were carried out,and the strain response of vortex-induced vibration was measured by the fiber Bragg grating strain sensor.The amplitude and frequency characteristics of the free-hanging pipe were investigated by modal analysis and wavelet transform data processing methods.It is revealed that the maximum amplitude of the VIV displacement response of the free-hanging pipe under the uniform flow mainly occurs at the bottom.The dominant frequencies in inline(IL)direction is basically two times that in cross flow(CF)direction.However,in the conditions where the modal transition occurs,the dominant frequencies in IL and CF directions are the same,accompanied by obvious"traveling wave","multi-frequency response"and"time-sharing"phenomenon.In addition,the Strouhal number of the overhanging pipe model in CF and IL under uniform sea currents are 0.15 and 0.30,which are slightly smaller than the results of flexible risers hinged at both ends.This value may serve as the parameter input for the vortex-induced vibration prediction of free-hanging pipes.

关 键 词：悬垂管 柔性立管 涡激振动 模型试验 

分 类 号：P756.2[天文地球—海洋科学]