油气混输泵压缩级内湍流强度及湍流耗散特性分析
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摘要
为了研究气液两相条件下油气混输泵压缩级内湍流强度和湍流耗散的分布规律,本文以螺旋轴流式油气混输泵为研究对象,采用CFD软件进行数值计算,得到从10%到70%含气率条件下油气混输泵压缩级内的湍流强度和湍流耗散特性。研究表明:气体越集中的位置也是介质流动越不均匀的位置;级间动静干涉作用、流动的不均匀性以及较大旋涡的出现均会导致湍流强度和湍流耗散程度的增加,且在压缩级内随着含气率的增加,湍流强度最大值先减小再增加,且低含气率下湍流强度最大值最大;油气混输泵压缩级内水力损失较大的区域主要集中在级间和导叶内以及叶轮进口区域。
In order to study the law governing the distribution of the turbulent flow intensity and dissipation inside the compression stages of an oil-gas multiphase pump under the condition of a gas-liquid twophase flow,the software CFD was employed to conduct a numerical calculation with a spiral axial flow oilgas multiphase pump serving as the object of study and the turbulent flow intensity and dissipation characteristics of the oil-gas multiphase pump in its compression stages were obtained under the condition of the air content ranging from 10% to 70%.The research results show that locations where gases are more concentrated are those where the flow of the working medium are not more uniform and any action of rotorstator interference between stages and presence of the non-uniformity of flows and relatively large vortexes can all lead to an increase of the said turbulent flow intensity and dissipation degree.With an increase of the air content in the compression stages,the maximum value of the turbulent flow intensity will first decrease and then increase.Furthermore,at a low air content,the maximum value of the turbulent flow intensity will be the maximum.The zones with relatively large hydraulic losses inside the compression stages of the oil-gas multiphase pump are mainly centralized at locations between stages,inside guide blades and at the inlet of the impeller.
In order to study the law governing the distribution of the turbulent flow intensity and dissipation inside the compression stages of an oil-gas multiphase pump under the condition of a gas-liquid twophase flow,the software CFD was employed to conduct a numerical calculation with a spiral axial flow oilgas multiphase pump serving as the object of study and the turbulent flow intensity and dissipation characteristics of the oil-gas multiphase pump in its compression stages were obtained under the condition of the air content ranging from 10% to 70%.The research results show that locations where gases are more concentrated are those where the flow of the working medium are not more uniform and any action of rotorstator interference between stages and presence of the non-uniformity of flows and relatively large vortexes can all lead to an increase of the said turbulent flow intensity and dissipation degree.With an increase of the air content in the compression stages,the maximum value of the turbulent flow intensity will first decrease and then increase.Furthermore,at a low air content,the maximum value of the turbulent flow intensity will be the maximum.The zones with relatively large hydraulic losses inside the compression stages of the oil-gas multiphase pump are mainly centralized at locations between stages,inside guide blades and at the inlet of the impeller.
引文
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[2]Zh ANG S,Wang Z,DENG H,et al.Effects of clearance volume on discharging characteristics of reciprocating oil-gas multiphase pump[J].China Mechanical Engineering,2014,25(19):2573-2578.
[3]Zh ANG S C,Ch EN X D,DENG H Y,et al.Numerical simulation of flow field for combined valve in reciprocating oil-gas multiphase pump[J].Oil Field Equipment,2012,41(12):33-36.
[4]Zh ANG Z,Zh ANG S,PING Y,et al.Influence of suction pressure on flow-rate characteristics of triplex double-function oil-gas multiphase pump[J].Oil Field Equipment,2015,44(9):26-30.
[5]Zh ANG S,YANG L,DENG H,et al.Calculating and analyzing input power of oil-gas multiphase pump of internal compression rotor[J].Mechanical Science&Technology for Aerospace Engineering,2015,34(5):694-698.
[6]余志毅,刘影.叶片式混输泵气液两相非定常流动特性分析[J].农业机械学报,2013,44(5):66-69.YU Zhi-yi,LIU Ying.Analysis of the unsteady gas-liquid two-phase flow characteristics of a blade type multiphase pump[J].Transactions of Agricultural Machinery,2013,44(5):66-69.
[7]张金亚,蔡淑杰,朱宏武,等.三级螺旋轴流式混输泵可压缩流场数值模拟[J].农业机械学报,2014,45(9):89-95.ZHANG Jin-ya,CAI Shu-jie,ZHU Hong-wu,et al.Numerical simulation of a compressible flow inside a three-stage helical-axial flow type multiphase pump[J].Transactions of Agricultural Machinery,2014,45(9):89-95.
[8]孔祥领,吕杨,高进伟,等.螺旋轴流式多相泵多级可压缩模拟研究[J].石油机械,2016,44(5):77-81.KONG Xiang-ling,LU Yang,GAO Jin-wei,et al.Research of the simulation of the multi-stage compressible flow in a helical-axial flow multiphase pump[J].Petroleum Machinery,2016,44(5):77-81.
[9]张金亚,蔡淑杰,朱宏武,等.螺旋轴流泵内气液两相流型可视化研究[J].工程热物理学报,2015,36(9):1937-1941.ZHANG Jin-ya,CAI Shu-jie,ZHU Hong-wu,et al.Study of the visualization of a gas-liquid two-phase flow pattern in a helical-axial flow multiphase pump[J].Journal of Engineering Thermophysics,2015,36(9):1937-1941.
[10]朱荣生,龙云,林鹏,等.螺旋轴流泵内部流场与压力脉动研究[J].农业机械学报,2014,45(7):103-110.ZHURong-sheng,LONG Yun,LIN Peng,et al.Study of the internal flow field and pressure pulsation inside a screw axial-flow pump[J].Transactions of Agricultural Machinery,2014,45(7):103-110.
[11]马希金,张贞贞,侯祎华.多级油气混输泵轴向间隙变化对其性能的影响[J].流体机械,2015(4):28-32.MA Xi-jin,ZHANG Zhen-zhen,HOU Yi-hua.Impact of changes of the axial clearance on the performance of a multistage oil-gas mixed transmission pump[J].Fluid Machinery,2015(4):28-32.
[12]王勇,刘厚林,袁寿其,等.离心泵内部空化特性的CFD模拟[J].排灌机械工程学报,2011,29(2):99-103.WANG Yong,LIU Hou-lin,YUAN Shou-qi,et al.CFD simulation of the internal cavitation characteristics of a centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2011,29(2):99-103.