低比转速复合叶轮离心泵的优化设计和试验研究

发布时间：2018-04-09 00:37

  本文选题：低比转速　切入点：复合叶轮　出处：《浙江理工大学》2011年硕士论文

【摘要】：低比转速离心泵主要的能量转换在复合叶轮内完成,因此针对复合叶轮的优化设计对离心泵的节能降耗有重要意义。CFD技术的快速发展为低比转速复合叶轮离心泵的优化设计提供了强有力的手段。本文在课题组原有研究的基础上以效率为优化目标,基于三维流动分析对具有长、短叶片的复合叶轮进行了优化设计,并对优化前后叶轮的低比转速复合叶轮离心泵整机进行了数值模拟与性能预测,最后对优化前后叶轮的离心泵进行了试验研究。主要内容如下: (1)介绍了本文优化设计及数值计算所采用的方法,利用Pro/E对过流部件:叶轮、诱导轮、蜗壳进行了建模。利用NUMECA软件,采用结构化网格对整机进行了网格划分; (2)对复合叶轮进行了参数化造型,以复合叶轮出口角β2和短叶片起始直径Di2两个参数为优化变量,及复合叶轮出口角β2一个参数为优化变量,在这两种优化策略下,基于效率为优化目标对复合叶轮单通道进行了优化设计研究,得到了两种策略下优化后的叶轮几何模型,将其绘制成零件图,为后续叶轮的加工提供依据; (3)采用雷诺时均Navier-Stokes方程和Spalart-Allmaras模型湍流模型对优化前后叶轮的低比转速离心泵(共3台)进行了整机的三维数值模拟;分析优化前后离心泵过流部件内的流场特性;并对整机工况下优化前后叶轮的低比转速离心泵性能进行了预测,验证了优化叶轮的离心泵的效率确实有所提高。 (4)对CFD优化前后叶轮的离心泵进行了外特性试验研究,得到了优化前后叶轮离心泵的性能曲线,并和数值模拟进行了对比分析。试验结果表明,优化设计得到的叶轮Ⅰ与叶轮Ⅱ达到预期的性能,验证了单个复合叶轮优化的可行性。
[Abstract]:The main energy conversion of the centrifugal pump with low specific speed is completed in the composite impeller.Therefore, the optimization design of composite impeller is of great significance to the energy saving and consumption reduction of centrifugal pump. The rapid development of CFD technology provides a powerful means for the optimization design of low specific speed composite impeller centrifugal pump.In this paper, based on the original research of the research group, the optimization design of the composite impeller with long and short blades is carried out based on the three-dimensional flow analysis with efficiency as the optimization objective.Numerical simulation and performance prediction of low specific speed composite impeller centrifugal pump before and after optimization are carried out. Finally, the centrifugal pump of impeller before and after optimization is experimentally studied.The main contents are as follows:This paper introduces the method of optimization design and numerical calculation, and uses Pro/E to model the flow parts: impeller, inducer and volute.Using NUMECA software, the structure grid is used to divide the whole machine.(2) Parametric modeling of composite impeller was carried out. Two parameters, 尾 _ 2 and Di2 _ 2, were used as optimization variables, and 尾 _ 2 as optimization variables. Under these two optimization strategies, the two parameters, 尾 _ 2 and 尾 _ 2, were used as optimization variables.Based on the optimization goal of efficiency, the optimization design of single channel of composite impeller is studied, and the optimized geometric model of impeller under two strategies is obtained, and the geometric model of impeller is drawn into part drawing, which provides the basis for the subsequent processing of impeller.3) Three-dimensional numerical simulation of centrifugal pump with low specific speed of impeller before and after optimization is carried out by using Reynolds time average Navier-Stokes equation and turbulence model of Spalart-Allmaras model, and the flow field characteristics in the flow parts of centrifugal pump before and after optimization are analyzed.The performance of the centrifugal pump with low specific speed before and after the optimization of the impeller is predicted, and the efficiency of the centrifugal pump with the optimized impeller is proved to be improved.4) the external characteristics of impeller centrifugal pump before and after CFD optimization are studied, and the performance curves of impeller centrifugal pump before and after optimization are obtained and compared with numerical simulation.The experimental results show that the optimal design of impeller 鈪，

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