含气率对气液两相流离心泵性能的影响
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摘要
为了研究进口含气率对气液两相流离心泵外特性以及内部流场特性的影响,该文采用计算流体动力学分析方法对某一气液两相流离心泵进行三维数值模拟研究。结果表明:扬程随着进口含气率的增加而降低,特别地,当进口含气率由3%增加到5%时,泵的扬程相对于纯水设计工况降低了37%;气液两相流工况叶轮流道会出现气体聚集区域,随着进口含气率的增加气体聚集区域面积也会增大;气体主要聚集在叶轮流道的上盖板附近,且随着进口含气率的增加气体聚集区向叶轮出口扩散。通过该研究得到以下结论:进口含气率的增加会导致泵的扬程降低;进口含气率会影响叶轮内部气体分布规律,进而影响内部流场,导致泵的性能发生改变。
In order to examine the influence of the inlet gas volume fraction(IGVF) on the external characteristics and internal flow field characteristics of a gas-liquid two-phase flow centrifugal pump, a three-dimensional numerical simulation study of the pump was carried out by using computational fluid dynamics method. The results show that the pump head decreases with the increase of IGVF. In particular, when IGVF increases from 3% to 5%, the pump head is reduced by 37% compared to the pure water operation condition. There is a gas accumulation area in the impeller channels under gas-liquid two-phase flow conditions, and the area of gas accumulation increases as IGVF increases. The gas mainly gathers near the shroud of the impeller channels, and the gas accumulation region diffuses toward the impelle r outlet as the IGVF increases. The following conclusions are obtained: the increasing IGVF will lead to the decrease of the pump head; IGVF will affect the gas-phase distribution law inside the impeller, affecting further the flow field of the pump, and resulting in the change of pump performance.
In order to examine the influence of the inlet gas volume fraction(IGVF) on the external characteristics and internal flow field characteristics of a gas-liquid two-phase flow centrifugal pump, a three-dimensional numerical simulation study of the pump was carried out by using computational fluid dynamics method. The results show that the pump head decreases with the increase of IGVF. In particular, when IGVF increases from 3% to 5%, the pump head is reduced by 37% compared to the pure water operation condition. There is a gas accumulation area in the impeller channels under gas-liquid two-phase flow conditions, and the area of gas accumulation increases as IGVF increases. The gas mainly gathers near the shroud of the impeller channels, and the gas accumulation region diffuses toward the impelle r outlet as the IGVF increases. The following conclusions are obtained: the increasing IGVF will lead to the decrease of the pump head; IGVF will affect the gas-phase distribution law inside the impeller, affecting further the flow field of the pump, and resulting in the change of pump performance.
引文
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[28]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.Experimental study of gas-liquid two-phase flow pattern in a helicon-axial multiphase pump by visualization[J].Journal of engineering thermophysics,2015,36(9):1937-1941.
[29]TABIB M V,ROY S A,JOSHI J B.CFD simulation of bubble column-An analysisof interphase forces and turbulence models[J].Chemical Engineering Journal,2008,139(3):589-614.
[2]司乔瑞,崔强磊,袁寿其,等.气液两相条件下进口含气率对离心泵相似定律的影响[J].农业机械学报,2018,49(2):107-112.SI Qiao-rui,CUI Qiang-lei,YUAN Shou-qi,et al.Influence of inlet gas volume fraction on similarity law in centrifugal pumps under gas-liquid two-phase condition[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(2):107-112.
[3]ZHOU D,SACHDEVA R.Simple model of electric submersible pump in gassy well[J].Petrol.Sci.Eng,2010,70:204-213.
[4]SHAO C L,LI C Q,Zhou J F.,Experimental investigation of flow patterns and external performance of a centrifugal pump that transports gas-liquid two-phase mixtures[J].International Journal of Heat and Fluid Flow 2018,71:460-469.
[5]MURAKAMI M,MINEMURA K.Effects of entrained air on the performance of a centrifugal pump[J].Bulletin of the JSME,1974,17(110):1047-1055.
[6]BARRIOS L.Visualization and modeling of multiphase performance inside an electrical submersible pump[D],The University of Tulsa,Tulsa,USA.2007.
[7]VERDE W M,BIAZUSSI J L,SASSIM N A,et al.Experimental study of gas-liquid two-phase flow patterns within centrifugal pumps impellers[J].Experimental Thermal and Fluid Science,2017.85:37-51.
[8]ZHANG J Y,CAI S J,LI Y J,et.al.Visualization study of gas-liquid two-phase flow patterns inside a three-stage rotodynamic multiphase pump[J].Experimental Thermal and Fluid Science.2016,70:125-138.
[9]ZHANG J Y,CAI S J,ZHU H W,et.al.Experimental investigation of the flow at theentrance of a rotodynamic multiphase pump by visualization[J].Journal of Petroleum Science and Engineering,2015,126:254-261.
[10]CARIDAD J,ASUAJE M,LENYERY F,et al.Characterization of a centrifugal pump impeller under two-phase flow conditions[J].Journal of Petroleum Science and Engineering,2008,63(1):18-22.
[11]付强,邢树兵,朱荣生,等.核主泵叶轮叶片进口边位置对气液两相流动特性的影响[J].核动力工程,2016,37(3):87-93.FU Qiang,XING Shu-bing,ZHU Rong-sheng,et al.Effect of blade inlet position on flow characteristics of nuclear reactor coolant pump under gas-liquid twophase condition[J].Nuclear Power Engineering,2016,37(3):87-93.
[12]卢金玲,席光,祁大同.离心泵叶轮内气液两相三维流动数值研究[J].工程热物理学报,2003,24(3):237-240.LU Jin-ling,XI Guang,QI Da-tong.Numerical study on the gas-liquid two-phase 3-D flow in the impeller of a centrifugal pump[J].Journal of Engineering Thermophysics,2003,24(3):237-240.
[13]王冕.气液两相流泵含气量对泵性能的影响研究[D].武汉工程大学,武汉,中国,2013.WANG Mian.The effect of gas volume to the gas-liquid two-phase flow centrifugal pump research[D],Wuhan Institute of Technology,Wuhan,China,2013.
[14]PAK E T,LEE J C.Performance and pressure distribution changes in a centrifugal pump under two-phase flow[J].Journal of Power and Energy,1998,212:165-171.
[15]班耀涛,赵宏,薛敦松.螺旋轴流式油气多相泵的性能预测模型[J].工程热物理学报,2000,21(2):187-190.BAN Yao-tao,ZHAO Hong,XUE Dun-song.Proformance predition model of helico-axial multiphase pump[J].Journal of Engineering Thermophysics,2000,21(2):187-190.
[16]黄思,王宏君,郑茂溪.叶片式混输泵气液两相流及性能的数值分析[J].华南理工大学学报(自然科学版),2007,35(12):11-16.HUANG Si,WANG Hong-jun,ZHENG Mao-xi.Numerical analysis of gas-liquid two-phase flow in multiphase rotodynamic pump and pump performance[J].Journal of South China University of Technology(Natural Science Edition),2007,35(12):11-16.
[17]ZHU J J,ZHANG H Q.Mechanistic modeling and numerical simulation of in-situ gas void fraction inside ESP impeller[J].Journal of Natural Gas Science and Engineering,2006,36:144-154.
[18]ZHU J J,GUO X Z,LIANG F C,et al.Experimental study and mechanistic modeling of pressure surging in electrical submersible pump[J].Journal of Natural Gas Science and Engineering,2017,45:625-636.
[19]MINEMURA K,UCHIYAMA T.Three-dimensinal calculation of air-water two-phase flow in centrifugal pump impeller based on a bubbly flow model[J].Journal of Fluids Engineering.1993,115(4):766-771.
[20]CARIDAD J,KENYERY F.CFD analysis of electric submersible pumps(ESP)handling two-phase mixtures[J].Journal of Energy Resources Technology,2004,126:99-103.
[21]PINEDA H,BIAZUSSI J,LOPEZ F,et al.Phase distribution analysis in an electrical submersible pump(ESP)inlet handling water-air two-phase flow using computational fluid dynamics(CFD)[J].Journal of Petroleum Science and Engineering,2016,139:49-61.
[22]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 investigation of compressible flow in a three-stage helicon-axial multiphase pump[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(9):89-95.
[23]冯建军,罗兴锜,吴广宽,等.间隙流动对混流式水轮机效率预测的影响[J].农业工程学报,2015,31(5):53-58.FENG Jian-jun,LUO Xing-qi,WU Guang-kuan,et al.Influence of clearance flow on efficiency prediction of francis turbines[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2015,31(5):53-58.
[24]MULLER T,LIMBACH P,SKODA R.Numerical 3DRANS simulation of gas-liquid flow in a centrifugal pump with an Euler-Euler two-phase model and a dispersed phase distribution[C].11th European Conference on Turbomachinery Fluid dynamic&Thermodynamics,Madrid,Spain,2015.
[25]何川,郭立君.泵与风机[M].北京,中国:中国电力出版社,2008.HE Chuan,GUO Li-jun.Pumps and fans[M].Beijing,Chain:Chain power press,2008.
[26]FERZIGER J H.Computational methods for fluid dynamic[M].Berlin:Springer Berlin Heidelberg,2002.
[27]SURYAWIJAYA P,KOSYNA G.Schaufeldruckmessun genimrotierenden System an einerRadialpumpebei Gas/Flüssigkeitsgemischf?rderung[J].ChemieIngenieur Technik,2000,72:1366-1371.
[28]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.Experimental study of gas-liquid two-phase flow pattern in a helicon-axial multiphase pump by visualization[J].Journal of engineering thermophysics,2015,36(9):1937-1941.
[29]TABIB M V,ROY S A,JOSHI J B.CFD simulation of bubble column-An analysisof interphase forces and turbulence models[J].Chemical Engineering Journal,2008,139(3):589-614.
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