轴流泵水力模型内部流场数值模拟及性能分析

发布时间：2018-11-23 11:39

【摘要】：轴流泵广泛应用于国民经济各领域，大量的市场需求对轴流泵的效率和运行稳定性提出了更高的要求，叶轮是轴流泵的重要元件，叶轮设计是否合理直接影响到轴流泵性能的好坏，轴流泵的水力模型是保证真机的能量标准、空蚀标准和运行稳定的根本。升力法是传统的轴流泵叶轮水力设计方法，是一种半理论半经验的方法，目前用流线法设计出了性能优秀的离心泵和混流泵水力模型，由于上述泵型同属叶片泵，本文中采用上述两种方法分别设计出轴流泵叶轮的水力模型，并对两种叶轮性能进行比较。要提高轴流泵的效率、扩大工况范围和提高可靠性，必须对泵的内部流动进行深入研究。通过对轴流泵内部流动进行数值模拟，获得准确的内部流场分布及各个过流部件的流动状态信息，是设计出优秀泵模型及对其进行优化设计的有效手段。本文主要研究工作和取得的成果如下： 1、对国内外轴流泵的研究现状进行概括总结及综合分析，根据轴流泵的基本设计理论分别采用升力法和流线法对叶轮进行水力设计。 2、运用三维造型软件Pro/E对轴流泵的过流部件进行三维实体造型，借助ICEM对实体模型划分出非结构化的网格。 3、对初始设计的两种水力模型进行数值计算，通过分析计算结果做出能量性能预估。比较两种水力模型的效率预估值，提出了采用流线法设计出性能指标更好的轴流泵水力模型。 4、运用CFD流场仿真技术对轴流泵的内部流动进行研究，计算以雷诺时均N-S方程和连续方程作为控制方程，采用标准κ-ε双方程的湍流模型使方程组封闭，使用SIMPLEC算法对流速和压力进行求解，，离散以二阶精度差分格式实现。在不同工况下对轴流泵的内部流动进行详细的数值模拟，得到并分析各过流部件内部详细的流动信息。
[Abstract]:The axial flow pump is widely used in various fields of the national economy. A large number of market demands put forward higher requirements for the efficiency and operation stability of the axial flow pump. Impeller is an important component of the axial flow pump. Whether impeller design is reasonable or not directly affects the performance of axial flow pump. The hydraulic model of axial flow pump is the fundamental to ensure the energy standard cavitation erosion standard and operation stability of real machine. The lift method is a traditional hydraulic design method for impeller of axial flow pump, which is a semi-theoretical and semi-empirical method. At present, the hydraulic models of centrifugal pump and mixed flow pump with excellent performance have been designed by streamline method. In this paper, the hydraulic models of axial flow pump impellers are designed by using the above two methods, and the performances of the two impellers are compared. In order to improve the efficiency of the axial flow pump, expand the operating range and improve the reliability, the internal flow of the pump must be deeply studied. Through the numerical simulation of the internal flow of the axial flow pump, the accurate internal flow field distribution and the flow state information of each flow passing part are obtained, which is an effective means to design the excellent pump model and optimize its design. The main research work and achievements in this paper are as follows: 1. The current research situation of axial flow pump at home and abroad is summarized and analyzed. According to the basic design theory of axial flow pump, hydraulic design of impeller is carried out by lift method and streamline method respectively. 2. 3D modeling software Pro/E is used to model the flow parts of axial flow pump, and ICEM is used to divide the model into unstructured meshes. 3. Two kinds of hydraulic models are numerically calculated, and the energy performance is predicted by analyzing the results. Compared with the efficiency of the two hydraulic models, an axial flow pump hydraulic model with better performance index was designed by streamline method. 4. The internal flow of axial flow pump is studied by CFD flow field simulation technique. The Reynolds time averaged N-S equation and continuous equation are used as governing equations, and the turbulent model of standard 魏-蔚 double equation is used to close the equations. The SIMPLEC algorithm is used to solve the velocity and pressure, and the discretization is realized by the second order precision difference scheme. Detailed numerical simulation of the internal flow of axial flow pump is carried out under different operating conditions, and detailed flow information is obtained and analyzed.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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