L管气液两相内流致振的流固耦合数值模拟
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摘要
为研究气液两相混输管道的内流导致管道破坏的机理,利用ANSYS Workbench软件,建立L形弯管有限元模型和气液两相CFD模型,进行L形弯管内流致振的流固耦合数值模拟。研究结果表明:流体水平冲向弯头后动量发生改变,最大压力出现在弯角处;加载预应力的管道模态计算的频率比不加预应力的管道模态计算的频率略有增大,但幅度甚微;两相流动在垂直方向(y)上产生的振动最小,在水平方向(x)上的振动幅度次之,最大振动出现在没有固定约束的z方向;最大位移点应力随时间周期性变化,且变化幅度逐渐减小;两相流频率接近管道的2阶固有频率,易产生共振,因此应在z方向加固定约束。研究结果有助于解决海上平台管路振动问题。
To study the mechanism of pipeline failure caused by the inflow of gas-liquid two-phase flow pipeline,the ANSYS Workbench software was used to establish the L-shaped pipe finite element model and the gas-liquid two-phase CFD model for investigating in the pipe vibration induced by internal flow. The results show that the fluid momentum changes when the fluid rushes to the L-shaped pipe horizontally,and the maximum pressure appears at the corner. The calculated frequency of the mode of the prestressed pipeis slightly larger than that of the mode of pipe without prestressing. However,the difference is very small. The two-phase flow produces the smallest vibration in the vertical direction( y),and the second large vibration amplitude in the horizontal direction( x),and the maximum vibration in the z direction without the fixed constraint. The stress of the maximum displacement point varies periodically over time,and the magnitude of the change gradually decreases. The two-phase flow frequency is close to the second-order natural frequency of the pipeline,and is easy to produce resonance. Therefore,a fixed constraint should be added in the z direction to prevent the pipeline vibration. The study could help to address the pipeline vibration on offshore platforms.
To study the mechanism of pipeline failure caused by the inflow of gas-liquid two-phase flow pipeline,the ANSYS Workbench software was used to establish the L-shaped pipe finite element model and the gas-liquid two-phase CFD model for investigating in the pipe vibration induced by internal flow. The results show that the fluid momentum changes when the fluid rushes to the L-shaped pipe horizontally,and the maximum pressure appears at the corner. The calculated frequency of the mode of the prestressed pipeis slightly larger than that of the mode of pipe without prestressing. However,the difference is very small. The two-phase flow produces the smallest vibration in the vertical direction( y),and the second large vibration amplitude in the horizontal direction( x),and the maximum vibration in the z direction without the fixed constraint. The stress of the maximum displacement point varies periodically over time,and the magnitude of the change gradually decreases. The two-phase flow frequency is close to the second-order natural frequency of the pipeline,and is easy to produce resonance. Therefore,a fixed constraint should be added in the z direction to prevent the pipeline vibration. The study could help to address the pipeline vibration on offshore platforms.
引文
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[9]刘勇,郭杰,孙慧,等.基于L形管道的气液两相流-流固耦合模拟计算[J].内蒙古石油化工,2014,18(1):1-3.LIU Y,GUO J,SUN H,et al. Fluid solid coupling simulate calculation of gas-liquid two-phase flow based on L type pipeline[J]. Inner Mongolia Petrochemical Industry,2014,18(1):1-3.
[10]刘昌领,罗晓兰,叶道辉,等.一端固定一端简支输流管道流固耦合振动分析[J].机械与电子,2013,31(7):19-22.LIU C L,LUO X L,YE D H,et al. Fluid-solid coupled vibration analysis of a pipeline with one end fixed and one end simply supported[J]. Mechanics and Electronics,2013,31(7):19-22.
[2]杨再勇,沙朋朋,姚青云.压力管道振动数值模拟分析[J].宁夏工程技术,2016,15(3):228-232.YANG Z Y,SHA P P,YAO Q Y. Numerical simulation analysis of pressure pipeline vibration[J]. Ningxia Engineering Technology,2016,15(3):228-232.
[3]吴钰骅,金伟良,龚顺风,等.海底管道流固耦合振动数值模拟[J].浙江大学学报(工学版),2009,43(4):782-788.WU Y H,JIN W L,GONG S F,et al. Numerical simulation of fluid-solid coupling vibration of submarine pipelines[J]. Journal of Zhejiang University(Engineering Edition),2009,43(4):782-788.
[4]王武,陈涛,杨帅,等. T型结构压力管道流固耦合模拟与试验验证[J].中国安全生产科学技术,2017,13(10):5-11.WANG W,CHEN T,YANG S,et al. Fluid-solid coupling simulation and experimental verification of Tshaped pressure pipelines[J]. China Safety Production Science and Technology,2017,13(10):5-11.
[5]苏新军,张修刚,王栋,等.气液两相流横掠错列圆柱形成旋涡脱落诱发管束振动的试验研究[J].热能动力工程,2004,19(1):14-16.SU X J,ZHANG X G,WANG D,et al. Experimental study on vibration of tube bundles induced by vortex shedding of gas-liquid two-phase flow across staggered cylinders[J]. Thermal Power Engineering,2004,19(1):14-16.
[6]马晓旭,田茂诚,张冠敏,等.水平管内气液两相流诱导振动的数值研究[J].振动与冲击,2016,35(16):204-210MA X X,TIAN M C,ZHANG G M,et al. Numerical study on induced vibration of gas-liquid two-phase flow in horizontal tubes[J]. Vibration and Shock,2016,35(16):204-210
[7]张林,窦益华,于凯强,等.流体激励下弯管流固耦合振动特性分析[J].油气井测试,2017,26(3):10-14.ZHANG L,DOU Y H,YU K Q,et al. Analysis of fluid-solid coupling vibration characteristics of elbows under fluid excitation by[J]. Oil and Gas Well Test,2017,26(3):10-14.
[8]宋学官,蔡林,张华. ANSYS流固耦合分析与工程实例[M].北京:中国水利水电出版社,2012.SONG X G,CAI L,ZHANG H. ANSYS fluid-solid coupling analysis and engineering example[M]. Beijing:China Water Resources and Hydropower Press,2012.
[9]刘勇,郭杰,孙慧,等.基于L形管道的气液两相流-流固耦合模拟计算[J].内蒙古石油化工,2014,18(1):1-3.LIU Y,GUO J,SUN H,et al. Fluid solid coupling simulate calculation of gas-liquid two-phase flow based on L type pipeline[J]. Inner Mongolia Petrochemical Industry,2014,18(1):1-3.
[10]刘昌领,罗晓兰,叶道辉,等.一端固定一端简支输流管道流固耦合振动分析[J].机械与电子,2013,31(7):19-22.LIU C L,LUO X L,YE D H,et al. Fluid-solid coupled vibration analysis of a pipeline with one end fixed and one end simply supported[J]. Mechanics and Electronics,2013,31(7):19-22.