基于CFD的旋转喷射泵数值模拟与优化研究

发布时间：2018-09-06 11:17

【摘要】：立式旋转喷射泵(简称旋喷泵),是基于毕托管原理研制的新型低比转速泵,具有流量小、扬程高、Q-H曲线平坦、效率高、结构简单等特点,广泛应用于食品、石油化工、冶金、造纸、消防等行业。由于国内对旋喷泵的研究起步较晚,研究不够全面深入,致使该类型泵的使用效率仍较低,应用较少。因此研究旋喷泵的内部流动规律和优化设计方法对该类型泵的推广和应用有着重大的理论价值和良好的前景。本论文主要应用数值模拟分析的方法,通过一定的理论基础研究,探求旋喷泵的流动特性,特别是集流管、叶轮、转子腔等主要结构的流动特性、设计参数及外特性关系,对已有的产品寻求优化方案,并开发出具有独立知识产权的高效旋喷泵,以满足市场和客户的新需求,同时也为旋喷泵基于CFD的设计和优化提供理论基础和实验论证。本文的主要工作是基于CFD理论及其应用软件,根据实际工况,设计多种模型,采用数值模拟的方法,对集流管及转子腔的内部流动进行流场分析和优化研究,由此得出最优水力结构参数。利用Pro/ENGINEER进行三维建模,导入ICEM-CFD进行网格划分,并利用CFD软件Ansys-CFX对集流管、转子腔的内部流场进行数值模拟,得到内部流场的速度场、压力场,并计算、对比分析旋喷泵的性能曲线——扬程、轴功、效率曲线。通过改变旋喷泵的结构参数,对设计的多种水力模型进行仿真计算,得出叶轮结构形式、叶片形状、叶片数,集流管的扩散段截面形状、转弯半径等结构参数对旋喷泵性能的影响,从而对叶轮、集流管和转子腔进行性能分析和优化,对比得出优化的理想结构。仿真模拟计算的准确性通过实验验证。有关旋喷泵的数值模拟技术、数值优化设计方法以及工程优化设计技术等正是本文工作的研究背景。对这些问题的深入研究,为旋喷泵的设计和优化提供理论基础和实验论证,具有非常重要的理论和实践意义。
[Abstract]:The vertical rotary jet pump (called rotary jet pump) is a new type of low specific speed pump based on the principle of Pitot. It has the characteristics of small flow rate, flat Q-H curve with high lift, high efficiency, simple structure and so on. It is widely used in food, petrochemical, metallurgy, etc. Paper, fire and other industries. Due to the late start of the domestic research on the rotary jet pump, the research is not thorough enough, so the efficiency of the pump is still low and the application is less. Therefore, it is of great theoretical value and good prospect to study the internal flow law and optimal design method of rotary jet pump for its popularization and application. This paper mainly uses the numerical simulation analysis method, through certain theoretical foundation research, explores the flow characteristic of the rotary jet pump, especially the flow characteristic of the main structure, such as the collecting tube, impeller, rotor cavity and so on, the design parameter and the external characteristic relation. In order to meet the new demand of market and customer, the optimization scheme of existing products is sought, and the efficient rotary jet pump with independent intellectual property is developed to meet the new demand of market and customers. At the same time, it also provides the theoretical basis and experimental demonstration for the design and optimization of rotary jet pump based on CFD. The main work of this paper is based on the CFD theory and its application software, according to the actual working conditions, design a variety of models, using numerical simulation method to analyze and optimize the flow field of the flow inside the collector tube and rotor cavity. The optimal hydraulic structure parameters are obtained. Pro/ENGINEER is used to build 3D model, ICEM-CFD is imported to mesh, and CFD software Ansys-CFX is used to simulate the internal flow field of collecting tube and rotor cavity. The velocity field and pressure field of internal flow field are obtained and calculated. The performance curve-head, shaft work and efficiency curve of rotary jet pump are compared and analyzed. By changing the structural parameters of the rotary jet pump and simulating various hydraulic models, the structure form of impeller, the shape of blade, the number of blades and the section shape of diffusive section of collecting tube are obtained. By analyzing and optimizing the performance of impeller, collecting tube and rotor cavity, the optimal structure is obtained by comparing the influence of turning radius and other structural parameters on the performance of rotary jet pump. The accuracy of simulation and calculation is verified by experiments. The research background of this paper is the numerical simulation technology, numerical optimization design method and engineering optimization design technology of rotary jet pump. The research on these problems provides theoretical basis and experimental demonstration for the design and optimization of rotary jet pump, which is of great theoretical and practical significance.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38

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