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考虑弹性基础的气液两相流海洋立管耦合振动分析
王琳,李玉星,刘昶,胡其会,王娅婷,王权
0
(中国石油大学储运与建筑工程学院,山东青岛 266580;山东省油气储运安全省级重点实验室,山东青岛 266580;中煤科工集团重庆设计研究院有限公司,重庆 400016)
摘要:
基于气液两相流立管系统的模态分析和气液两相流流动特性试验,预测与评估不同流态的气液两相流引起弹性基础上海洋立管的振动特性。模态分析中考虑流体密度分布的变化和不同弹性基础系数对振动模态的影响;气液两相流流动特性试验中,绘制含7种流型的流型图,测试各流型的压力波动特性并进行时频分析。模态分析与试验结果相结合,分析不同弹性基础时7种流型引起立管共振的可能性,并预测各流型引起立管振动的特性。最后,测试7种流型引起的试验装置的振动响应,验证耦合振动分析方法的准确性。结果表明:气液两相流和弹性基础对立管系统的固有频率和振型有显著影响;立管系统无弹性基础支承时,严重段塞流I、严重段塞流Ⅲ、段塞流和波动气泡流会引起立管系统的共振;基础的弹性系数较大时,两相流不会引起立管系统的共振,试验装置的振动响应与管内两相流流动参数的波动规律一致。
关键词:  气液两相流  海洋立管  弹性基础  有限单元法  模态分析  流固耦合
DOI:10.3969/j.issn.1673-5005.2016.01.019
投稿时间:2015-09-06
基金项目:国家自然科学基金项目(51404290)
Fluid structure interaction analysis of gas-liquid two-phase flow in marine riser system on an elastic foundation
WANG Lin,LI Yuxing,LIU Chang,HU Qihui,WANG Yating,WANG Quan
(College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;Shandong Key Laboratory of Oil & Gas Storage and Transport Safety Engineering, Qingdao 266580, China;CCTEG Chongqing Engineering Company Limited, Chongqing 400016, China)
Abstract:
To predict and evaluate the vibration characteristics of the marine risers caused by two phase flow in different flow regimes, the modal analysis and the gas-liquid tow-phase flow experiments were carried out. The influences of fluid density distribution and elastic foundation coefficients on vibration mode were considered in the modal analysis. The flow pattern maps including seven types of flow patterns were plotted in the study. The time domain and frequency domain analysis of the pressure fluctuation characteristics for different flow patterns were conducted, the possibility of resonance caused by seven types of flow patterns in different elastic foundations was analyzed, and the coupling vibration characteristics of the riser system were predicted. In addition, the dynamic response of the riser system was tested to verify the accuracy of the coupling vibration analysis method. The analysis results show that gas-liquid tow-phase flow and elastic foundation have significant impacts on natural frequency and vibration mode of the riser system. Severe slugging I, severe slugging III, slug flow and disturbed bubble flow can cause resonance when the riser system has no elastic foundation. If the elasticity coefficient of the foundation is large enough, two-phase flow can 't cause resonance of the riser system. The vibration response of the riser system is consistent with the fluctuation of the gas-liquid two-phase flow characteristics in the riser.
Key words:  gas-liquid two-phase flow  marine risers  elastic foundation  FEM  modal analysis  fluid structure interaction
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