低含液管道内气液两相流动特性的数值研究
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摘要
基于管内气液两相流动理论,建立了低含液管道两相流动数学模型,对管路内气相流场、液滴空间分布进行了研究。结果表明:运用边界层网格与增强壁面函数相结合的方法,能够很好地模拟近壁处流场;水平管内液滴群主要集中在中下部区域;弯头内离心力促使液滴群向外侧运动;受上游弯头的影响,竖直管内存在一对涡核,沿流动方向,竖直管右侧液滴群浓度逐渐下降,液滴群分布范围变大,有向左侧运动的行为。
Based on the theory of gas-liquid flow in the pipeline,a mathematical model of gas-liquid flow with low liquid loading was established. The gas flow fieldand the droplet spatial distribution were studied in detail. Boundary layer mesh and enhanced wall function were combined to simulate the flow field near the wall. It was observed that in horizontal pipes droplets were concentrated on the lower region,while in elbow pipes droplets tended to move to the outside due to the centrifugal force. Affected by the elbow,there was a pair of vortex in the downstream vertical pipe. Droplet concentration near the right wall gradually decreased along the flow direction. The areaoccupied by the droplets expanded,moving left.
Based on the theory of gas-liquid flow in the pipeline,a mathematical model of gas-liquid flow with low liquid loading was established. The gas flow fieldand the droplet spatial distribution were studied in detail. Boundary layer mesh and enhanced wall function were combined to simulate the flow field near the wall. It was observed that in horizontal pipes droplets were concentrated on the lower region,while in elbow pipes droplets tended to move to the outside due to the centrifugal force. Affected by the elbow,there was a pair of vortex in the downstream vertical pipe. Droplet concentration near the right wall gradually decreased along the flow direction. The areaoccupied by the droplets expanded,moving left.
引文
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[18]郝雅洁,刘嘉宇,袁竹林,等.除雾器内雾滴运动特性与除雾效率[J].化工学报,2014,65(12):4669-4677.
[19]Mito,Y.,Hanratty,T.J.Trajectory mechanism for particle deposition in annular flow[J].International Journal of Multiphase Flow,2007,33(1):101-107.
[20]Han,H.,Gabriel,K.A numerical study of entrainment mechanism in axisymmetric annular gas-liquid flow[J].Journal of Fluids Engineering,2007,129:293-301.
[21]Kader,B.A.Temperature and concentration profiles in fully turbulent boundary layers[J].International Journal of Heat and Mass Transfer,1981,24(9):1541-1544.
[22]Nikuradse,J.Laws ofturbulent flow in smooth pipes[J].National Aeronautics and Space Administration,1966.
[23]章梓雄,董曾南.粘性流体力学[M].第2版.北京:清华大学出版社,2011:261-263.
[2]管孝瑞,王建军,金有海,等.低含液管线内液膜厚度分布特性的试验研究[J].流体机械,2017,45(2):6-11.
[3]刘清,王超.天然气超音速旋流脱水装置设计及凝结特性分析[J].石油与天然气化工,2016,45(3):1-5.
[4]殷嵩.雅克拉凝析气田集气管道腐蚀研究与治理[J].安全、健康和环境,2014,14(4):44-46.
[5]Guan,X.R.,Zhang,D.L.,Wang,J.J.,et al.Numerical and electrochemical analyses on carbon dioxide corrosion of X80 pipeline steel under different water film thicknesses in NACE solution[J].Journal of Natural Gas Science and Engineering,2017,37:199-216.
[6]雷雨.湿天然气管道低含液率气液两相流液滴夹带机理研究[D].西安:西安石油大学,2015.
[7]陈思维,覃明友,刘德绪,等.高含硫气田湿气集输管道冲蚀风险预测研究[J].天然气与石油,2015,33(1):80-83.
[8]蒋秀,张艳玲,屈定荣,等.缓蚀剂在天然气集输管道内的分布规律及对管道腐蚀的影响[J].安全、健康和环境,2015,15(05):18-20,49.
[9]Verdin,P.G.,Thompson,C.P.,Brown,L.D.CFD modelling of stratified/atomization gas-liquid flow in large diameter pipes[J].International Journal of Multiphase Flow,2014,67:135-143.
[10]Ayala,O.,Parishani,H.,Chen,L.,et al.DNS of hydrodynamically interacting droplets in turbulent clouds:Parallel implementation and scalability analysis using 2D domain decomposition[J].Computer Physics Communications,2014,185(12):3269-3290.
[11]石一丁.埋地管道火灾后果模拟分析[J].安全、健康和环境,2016,16(03):21-24.
[12]王正,姜春明,赵祥迪,等.CFD模拟分析技术在罐区火灾事故分析中的应用[J].安全、健康和环境,2015,15(01):19-22.
[13]洪厚胜,张志强,蔡子金,等.CFD在自吸反应器气液流动和传质特性研究中的应用[J].化工学报,2014,65(12):4684-4691.
[14]于安峰,王鹏,张杰东,等.应用计算流体力学研究低热值火炬燃烧过程[J].安全、健康和环境,2016,16(08):4-8.
[15]Demay,C.,Herard,J.M.A compressible two-layer model for transient gas-liquid flows in pipes[J].Continuum Mechanics&Thermodynamics,2017,29(2):385-410.
[16]Buffo,A.,Vanni,M.,Marchisio,D.L.Simulation of a reacting gas-liquid bubbly flow with CFD and PBM:Validation with experiments[J].Applied Mathematical Modelling,2017,44:43-60.
[17]潘晓慧,马春元,崔琳.两相均流板对弯管中气固两相运动分布特征的影响[J].化工学报,2016,67(6):5051-5057.
[18]郝雅洁,刘嘉宇,袁竹林,等.除雾器内雾滴运动特性与除雾效率[J].化工学报,2014,65(12):4669-4677.
[19]Mito,Y.,Hanratty,T.J.Trajectory mechanism for particle deposition in annular flow[J].International Journal of Multiphase Flow,2007,33(1):101-107.
[20]Han,H.,Gabriel,K.A numerical study of entrainment mechanism in axisymmetric annular gas-liquid flow[J].Journal of Fluids Engineering,2007,129:293-301.
[21]Kader,B.A.Temperature and concentration profiles in fully turbulent boundary layers[J].International Journal of Heat and Mass Transfer,1981,24(9):1541-1544.
[22]Nikuradse,J.Laws ofturbulent flow in smooth pipes[J].National Aeronautics and Space Administration,1966.
[23]章梓雄,董曾南.粘性流体力学[M].第2版.北京:清华大学出版社,2011:261-263.
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