井下螺旋轴流式混抽泵增压单元仿真设计研究
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摘要
井下螺旋轴流式多相泵具有叶片泵和压缩机的双重特性,是一种单井、无杆采油泵,对高含气的流体具有很好的适应性,针对该种泵的研发已成为一大热点。借助国家重大专项和863项目平台,本文讨论了新型井下螺旋轴流式混抽泵增压单元主要设计参数的选取原则和范围,确定了增压单元的设计参数,为高含气油藏及煤层气田的开发奠定了理论基础。并利用Solidworks软件对井下螺旋轴流式混抽泵增压单元进行三维造型。
为了研究单级增压单元内部流场及相应的运行特性,建立了较为完善的CFD分析模型。利用Fluent及其预处理软件Gambit,采用标准k-ε模型、非结构网格和Eulerian模型模拟了单级增压单元内的三维紊流场。通过对气液两相介质在流道内流动情况的分析为改善泵的性能提供一定的依据。
利用基于计算流体动力学(CFD)与有限元的方法对该种泵叶轮进行强度分析。以叶轮的实际工况为输入条件,将CFD计算得到的叶轮表面压力加载至强度分析的叶轮模型表面进行强度分析,这种方法能够真实反映叶轮表面的受力状态,因而具有较为重要的工程实用价值。
对自主开发的新型井下螺旋轴流式混抽泵样机进行了外特性实验研究,得到样机在纯水及不同入口含气率时的外特性曲线,结果表明该样机能高效混抽高含气率介质。分析了含气率、转速和气液总流量的变化对井下螺旋轴流式混抽泵外特性的影响,为该种泵下一步的研发及工业应用提供了实验依据和工作基础。
Downhole helico-axial multiphase pump with double features of the vane pump and compressor, is a new technology of multiphase Pumping,R&D on helico-axial multiphase pump become a hot topic nowadays. Based on major projects for science and technology development and 863 Project, this paper studied the selection rulers and extents of main designing parameters, and determined the main designing parameters, establishing theoretical foundation for the developing of high gas reservoir and coal bed methane field. Three-dimensional model of the pump is completed by Solidworks.
In order to complete the numerical simulation on internal flow and operating characteristics of downhole multiphase pump compress unit, establishing perfect CFD analysis model, the three-dimensional turbulent current fields inside the impellers of compression unit for downhole multiphase pumps were simulated by using Fluent and its pretreatment software Gambit. The calculation of multiphase flow is based on the standard k ?εturbulent current mode1, unstructured grid and the Eulerian models. Reference information for the improvement of the pump can be obtained by the analysis of the flow of gas-oil in the channel of pump.
According to computational fluid dynamics and finite element analysis software ANSYS, this paper provided a method to analyze the strength of impeller blade for multiphase pump. The paper finally figured out the real pressure distribution on the blade surfaces, and then loaded the pressure distribution to the blade model surfaces for carrying out strength analysis. As it can reflect real force condition of blade surfaces, the method provided in this paper obtains great value to real application.
The experiment is carried out to study on the self-designed prototype of the new downhole helico-axial multiphase pump and its external characteristics. The characteristics curve of the prototype under pure water and different GVF conditions were finally obtained, and the result indicates this pump can be efficient in pumping high GVF medium. This paper describes detailed experimental steps and analyzes affection of the changeable void fraction to the external characteriatics of the multiphase pump. The analysis result provides materials for the further development and improvement of multiphase pump.
为了研究单级增压单元内部流场及相应的运行特性,建立了较为完善的CFD分析模型。利用Fluent及其预处理软件Gambit,采用标准k-ε模型、非结构网格和Eulerian模型模拟了单级增压单元内的三维紊流场。通过对气液两相介质在流道内流动情况的分析为改善泵的性能提供一定的依据。
利用基于计算流体动力学(CFD)与有限元的方法对该种泵叶轮进行强度分析。以叶轮的实际工况为输入条件,将CFD计算得到的叶轮表面压力加载至强度分析的叶轮模型表面进行强度分析,这种方法能够真实反映叶轮表面的受力状态,因而具有较为重要的工程实用价值。
对自主开发的新型井下螺旋轴流式混抽泵样机进行了外特性实验研究,得到样机在纯水及不同入口含气率时的外特性曲线,结果表明该样机能高效混抽高含气率介质。分析了含气率、转速和气液总流量的变化对井下螺旋轴流式混抽泵外特性的影响,为该种泵下一步的研发及工业应用提供了实验依据和工作基础。
Downhole helico-axial multiphase pump with double features of the vane pump and compressor, is a new technology of multiphase Pumping,R&D on helico-axial multiphase pump become a hot topic nowadays. Based on major projects for science and technology development and 863 Project, this paper studied the selection rulers and extents of main designing parameters, and determined the main designing parameters, establishing theoretical foundation for the developing of high gas reservoir and coal bed methane field. Three-dimensional model of the pump is completed by Solidworks.
In order to complete the numerical simulation on internal flow and operating characteristics of downhole multiphase pump compress unit, establishing perfect CFD analysis model, the three-dimensional turbulent current fields inside the impellers of compression unit for downhole multiphase pumps were simulated by using Fluent and its pretreatment software Gambit. The calculation of multiphase flow is based on the standard k ?εturbulent current mode1, unstructured grid and the Eulerian models. Reference information for the improvement of the pump can be obtained by the analysis of the flow of gas-oil in the channel of pump.
According to computational fluid dynamics and finite element analysis software ANSYS, this paper provided a method to analyze the strength of impeller blade for multiphase pump. The paper finally figured out the real pressure distribution on the blade surfaces, and then loaded the pressure distribution to the blade model surfaces for carrying out strength analysis. As it can reflect real force condition of blade surfaces, the method provided in this paper obtains great value to real application.
The experiment is carried out to study on the self-designed prototype of the new downhole helico-axial multiphase pump and its external characteristics. The characteristics curve of the prototype under pure water and different GVF conditions were finally obtained, and the result indicates this pump can be efficient in pumping high GVF medium. This paper describes detailed experimental steps and analyzes affection of the changeable void fraction to the external characteriatics of the multiphase pump. The analysis result provides materials for the further development and improvement of multiphase pump.
引文
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[4] Perk Skiftesvik and Jonarve Svaren,multiphase Pumps and Flow Meters-Status of field Testings OTC7929.
[5]李增亮,张来斌,何元君等.双螺杆油气混输泵设计使用中有关问题的讨论[J].石油机械,2002,30(10):48-50
[6] Per K. Skiftesvik. Multiphase Pumps And Flow Meters-Stadus Of Field Testing. Proc. Offshore Technoly Conf. Houston,1995,3:567-578.
[7]郑俐丹,赵宏,薛敦松.油气多相泵的最新研制进展[J].水泵技术,2001,(3):15-19.
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[9]宇富平,任爱菊,刘克强.螺旋轴流式多相泵的研究现状[J].石油矿场机械,2004,33(8):4-7.
[10] F .C.Lockwood,T.Abbas,N .H.Kandamby,etal.CFD experience on industrial combustors. Progress in Computational Fluid Dynamics,2001.1( 1-3):1-13
[11] B.A dams,M.Cremer,J.Valentine,etal. Use of CFD modeling for design of NOx reduction systems in utility boilers. in Proceedings of the UPGC 2002 International Joint Power Generation Conference,Jun2 4-262 002.20 02,Scottsdale,A Z,United States: American Society of Mechanical Engineers
[12] K .R .Laflin,S.M .Klausmeyer,T.Zickuhr,etal. Summary of data from the second AIAA CFD drag prediction workshop( invited).in 42nd AIAA Aerospace Sciences Meeting and Exhibit, Jan5-8 2004.2004, Reno, NM United States: American Institute of Aeronautics and Astronautics Inc,Reston,United States
[13] T. Kajishima,Y.Miyake. Discussion on eddy viscosity models on the basis of the largeed dysimulation of turbulent flow in a square duct.Computers& Fluids,1992,21(2):151-161
[14] D.Choudhury. FLUENT simulation of buoyancy-driven flow in a square enclosure with variable viscosity efects. in Proceedings of the1995 ASME International Mechanical Engineering Congress and Exposition. Part1 (of2),Nov12-17 1995.1995,San Francisco,CA,USA:ASME,New York,NY,USA
[15] V.G .Ferreira,N.Mangiavacchi,M.F. Tome,etal. Numerical simulation of turbulent free surface flow with two-equation k -εeddy-viscosity models. In ternational Journal for Numerical Methods in Fluids,2004,44 (4):347-375
[16] A.M.Davies. Numerical problems in simulating tidal flows with a frictional-velocity-dependent eddy viscosity and the in fluence of stratification. In ternational Journal for Numerical Methods in Fluids,1993,16(2):105-131
[17]成立.泵站进水弯道三维流动分析及流态改善研究[J].扬州大学学报(自然科学版),2002,5(2):64-68
[18]卢金铃,席光,祁大同.气液两相流泵的研究进展[J].水利学报,2001,(6):57-61
[19]黄思,吴玉林.叶片式泵内气液两相泡状流的三维数值计算[J].水利学报,2001,(6):57-61
[20] A .Burns,A.Splawski,S. Lo,etal. Application of coupled solver technology to CFD modeling of multiphase flows with CFX.in First International Conference on Computational Methods in Multiphase Flow,Multiphase Flow1,Mar14 -16 2001.20 01,orlando,FL,United States:Computational Mechanics Inc,Billerica,United States
[21] W.A.Wieselquist. One validation case of the CFD software Fluent:Part of the development effort of a new reactor an analysis tool. in 10th International Conference on Nuclear Engineering (ICONS10),Apr14 -18 2002.2002,Arlington,VA,United States: American Society of Mechanical Engineers
[22] D.R. Ho se,P. V. Lawford,A .J. Narracot,etal .Fluid-solid interaction:Benchmarking of an external coupling of ANSYS with CFX for cardiovascular applications. Journal of Medical Engineering and Technology,2003,27(1):23-31
[23] R.Bolot,J.Li,C. Coddet. Modeling of thermal plasmajets:A comparison between Phoenics and Fluent. in Proceedings of the International Thermal Spray Conference, May10-12 2004. 2004,Osaka,Japan:ASM International,9639 Kinsman Road,OH4 4073-0002,United States.
[24] H .M.Kim,H .C.No. Analysis of power spectrum density in the PWR fuel assembly using the 3-D LES turbulent model of Fluent6. in 12th International Conference on Nuclear Engineering (ICONS 12 )-2004,Apr25 -29 2004. 2004.Arlington,VA,United States: American Society of Mechanical Engineers,New York,NY10016-5990,United States
[25]施法佳,陈红勋.轴流泵内部流动数值模拟中湍流模式可用性的研究[J].上海大学学报(自然科学版),2006,12(3):273-277
[26]张计光,陈红勋,马峥,施法佳.双吸泵内流场的三维数值模拟及流动分析[J].上海大学学报(自然科学版),2006,12(2):186-190
[27]马希金,郭俊杰,孙永平.轴流式油气混输泵内部的CFD分析及优化设计[J].化工机械,2004,31(2):90-92
[28]马希金,王宏亮,赵学.轴流式油气混输泵压缩级流场CFD模拟分析[J].农业机械学报,2006,37(2):41~44
[29]马希金,郭俊杰,吴蓓.CFD法设计轴流式油气混输泵初探[J].流体机械,2004,32(7):15-18
[30]柴胜凯,罗兴绮,廖伟丽.轴流泵叶轮内部三维流动分析[J].排灌机械,2004,22(1):16-19
[31]李龙,王泽.轴流泵内部流动的数值模拟研究[J].流体机械,2007,35(4):16-18
[32]王正伟,崔涛.轴流式水轮机能量特性预测分析[J].水力发电,2002(11):46-47
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