离心泵内部含沙水流动数值分析及性能优化
发布时间：2018-10-30 16:02
【摘要】：本研究针对某型号离心泵分别开展了在清水及含沙水流体介质的全流道数值模拟,并将其在清水介质中的数值模拟结果与试验数据进行了对比分析,主要涉及的研究内容及成果有以下几点:第一,广泛参阅了大量国内外相关研究的参考文献,总结了本文的工程研究背景,阐述了国内外水沙固液两相流的研究现状,得到了本文的研究方法、内容以及工程意义等。第二,根据厂家提供的离心泵原始三维结构图和设计参数,借助专业的泵与旋转机械设计工具CFturbo,对离心泵各过流部件做三维实体模型构建;接下来把保存好的三维模型导入到通用的三维建模软件UG6.0中,对离心泵进口延长段、叶轮、蜗壳以及出口延长段做进一步的优化装配并保存;将保存好的各三维实体分别导入ANSYS网格生成模块ICEM进行网格划分,对于不同流体域的复杂程度,选用不同的网格划分方法,其中包括了六面体结构化网格和四面体非机构化网格,生成的网格质量达到计算精度后进行组合并保存。第三,将划分好的离心泵各部件网格导入CFX-Pre,采用标准k-ε模型对N-S方程进行封闭求解,借助贴体坐标和交错网格系统对N-S方程进行离散,然后用SIMPLE算法求解N-S方程,对离心泵全流道进行不同工况下清水和含沙水介质的数值计算。第四,借助后处理模块CFX-Post,得到了离心泵各过流部件在清水中工作的压力分布,以及内流场的速度分布、湍动能等,并且将数值模拟结果与试验数据进行了对比论证,揭示了本研究的可靠性;得到了水沙运行介质中各过流部件表面的压力分布和泥沙分布等情况,然后对离心泵各部位的磨损特性进行了探讨;针对原型泵存在的结构问题进行了适当的改进,达到了一定优化效果。
[Abstract]:In this study, the full channel numerical simulation of a certain type of centrifugal pump was carried out in clear water and sand containing water medium, and the numerical simulation results in clear water medium were compared with the experimental data. The main research contents and results are as follows: first, a large number of domestic and foreign related references are widely consulted, the engineering research background of this paper is summarized, and the research status of water-sand solid liquid two-phase flow at home and abroad is expounded. The research method, content and engineering significance of this paper are obtained. Secondly, according to the original three-dimensional structure diagram and design parameters of centrifugal pump provided by the manufacturer, using the professional pump and rotating machinery design tool CFturbo, to build the three-dimensional solid model of each flow part of centrifugal pump; Then the saved 3D model is imported into the general 3D modeling software UG6.0, and the inlet extension section, impeller, volute and outlet extension section of centrifugal pump are further optimized and stored. The saved 3D entities are imported into the ANSYS mesh generation module (ICEM) for mesh generation, and different meshing methods are selected for the complexity of different fluid domains. It includes hexahedron structured meshes and tetrahedron non-machined meshes, which can be combined and saved after the quality of the generated meshes reach the accuracy of calculation. Thirdly, the grid of the components of the centrifugal pump is imported into CFX-Pre, to solve the N-S equation by using the standard k- 蔚 model, and the N-S equation is discretized by the body-fitted coordinates and staggered grid system. Then the N-S equation is solved by SIMPLE algorithm, and the numerical calculation of the flow channel of centrifugal pump under different working conditions is carried out. Fourthly, the pressure distribution, velocity distribution and turbulent kinetic energy of the flow field of centrifugal pump are obtained by CFX-Post, and the numerical simulation results are compared with the experimental data. The reliability of this study is revealed. The pressure distribution and sediment distribution on the surface of the flow parts in the water and sediment running medium are obtained, and then the wear characteristics of various parts of the centrifugal pump are discussed. The structure of the prototype pump is improved and the optimization effect is achieved.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV136
本文编号：2300476
[Abstract]:In this study, the full channel numerical simulation of a certain type of centrifugal pump was carried out in clear water and sand containing water medium, and the numerical simulation results in clear water medium were compared with the experimental data. The main research contents and results are as follows: first, a large number of domestic and foreign related references are widely consulted, the engineering research background of this paper is summarized, and the research status of water-sand solid liquid two-phase flow at home and abroad is expounded. The research method, content and engineering significance of this paper are obtained. Secondly, according to the original three-dimensional structure diagram and design parameters of centrifugal pump provided by the manufacturer, using the professional pump and rotating machinery design tool CFturbo, to build the three-dimensional solid model of each flow part of centrifugal pump; Then the saved 3D model is imported into the general 3D modeling software UG6.0, and the inlet extension section, impeller, volute and outlet extension section of centrifugal pump are further optimized and stored. The saved 3D entities are imported into the ANSYS mesh generation module (ICEM) for mesh generation, and different meshing methods are selected for the complexity of different fluid domains. It includes hexahedron structured meshes and tetrahedron non-machined meshes, which can be combined and saved after the quality of the generated meshes reach the accuracy of calculation. Thirdly, the grid of the components of the centrifugal pump is imported into CFX-Pre, to solve the N-S equation by using the standard k- 蔚 model, and the N-S equation is discretized by the body-fitted coordinates and staggered grid system. Then the N-S equation is solved by SIMPLE algorithm, and the numerical calculation of the flow channel of centrifugal pump under different working conditions is carried out. Fourthly, the pressure distribution, velocity distribution and turbulent kinetic energy of the flow field of centrifugal pump are obtained by CFX-Post, and the numerical simulation results are compared with the experimental data. The reliability of this study is revealed. The pressure distribution and sediment distribution on the surface of the flow parts in the water and sediment running medium are obtained, and then the wear characteristics of various parts of the centrifugal pump are discussed. The structure of the prototype pump is improved and the optimization effect is achieved.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV136
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