Parametric Stability Analysis of Marine Risers with Multiphase Internal Flows Considering Hydrate Phase Transitions

作     者：LIANG Weixing LOU Min LIANG Weixing;LOU Min

作者机构：College of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2021年第20卷第1期

页      面：23-34页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0710[理学-生物学] 0908[农学-水产] 08[工学] 0707[理学-海洋科学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 082002[工学-油气田开发工程] 0814[工学-土木工程] 

基　　金：funded by the National Natural Sci-ence Foundation of China(No.U2006226) the National Key Research and Development Program of China(No.2016YFC0303800) the National Natural Science Foundation of China(No.51579245)。 

主　　题：hydrate phase transition marine risers multiphase internal flow parametric stability vibration response 

摘      要：This study investigates the effects of multiphase internal flows that consider hydrate phase transitions on the parametric stability of marine risers.A numerical model of the multiphase internal flow that considers a hydrate phase transition is established.The model first solves the flow parameters and subsequently obtains the natural frequencies of risers with different gas intake ratios.The stability charts of marine risers with different gas intake ratios are plotted by applying Floquet theory,and the effects of the gas intake ratio on the instability and vibration response of the risers are identified.The natural frequency increases with an increase in the gas intake ratio;thus,instability zones move to higher frequency ranges in the stability charts.As the increasing gas intake ratio reduces the damping effect of the Coriolis force,the critical amplitude of the heave in the unstable region decreases,especially when hydrodynamic damping is not considered.As a result,higher-order unstable regions are excited.When in an unstable region,the vibration response curve of a riser with a high gas intake ratio excited by parametric resonance diverges quickly due to parametric resonance.