电站用节段式离心泵全面性能优化设计及数值模拟研究

发布时间：2018-06-08 17:47

本文选题：节段式离心泵 + 传统设计方法　；参考：《华北电力大学》2011年硕士论文

【摘要】：本文根据火电厂节段式多级离心泵使用中出现的情况,提出对其进行全面性能优化设计的必要性,接着对离心泵的传统设计方法,即相似换算法和速度系数法进行介绍,并指出各自的局限性:即相似换算法设计结果在很大程度上要依赖优秀水力模型的技术水平,若没有合适的优秀水力模型,将无法开展新产品的设计,而速度系数法中系数选取范围的宽长性,使初设计者无从下手感到很困惑,并且同一设计参数,不同的设计者会设计出不同的设计结果,本文根据工程实际中的设计经验,提出一种基于Excel的有效设计方法。结合离心泵性能影响因素,对设计过程中的高效率、高抗汽蚀性能、无驼峰曲线及运行范围内功率无过载等目标建立分目标模型,并用数学规划理论对多目标模型进行统一目标函数,根据实际设计经验和优秀水力模型库系数的统计,对统一目标函数提出相应的约束条件。随着CFD技术发展日趋完善和分析、计算结果精确度的提高,成为离心泵设计、研究领域不可或缺的一种检验设计的方法。本文介绍了节段式离心泵的叶轮基于Solidwoks的实体造型技术,同时采用Flow Simulation流体分析软件对叶轮内部流场进行了分析。
[Abstract]:According to the situation in the use of segmental multistage centrifugal pump in thermal power plant, this paper puts forward the necessity of overall performance optimization design, and then introduces the traditional design methods of centrifugal pump, that is, similarity conversion method and velocity coefficient method. It is pointed out that the design results of the similarity conversion method depend on the technical level of the excellent hydraulic model to a great extent, and if there is no suitable excellent hydraulic model, the design of the new product will not be carried out. But in the velocity coefficient method, the width and length of the selection range of the coefficient makes the initial designer feel perplexed, and with the same design parameter, different designers will design different design results. In this paper, according to the design experience in engineering practice, This paper presents an effective design method based on Excel. Combining with the influencing factors of centrifugal pump performance, a sub-objective model is established for the objectives of high efficiency, high cavitation resistance, no hump curve and no power overload in the operation range during the design process. According to the practical design experience and the statistics of the excellent hydraulic model base coefficient, this paper puts forward the corresponding constraint conditions for the unified objective function. With the development of CFD technology, the unified objective function is improved and analyzed. The improvement of the accuracy of the calculation results has become an indispensable test design method in the field of centrifugal pump design and research. The solid modeling technology of impeller of segmental centrifugal pump based on Solidwoks is introduced in this paper. Flow simulation fluid analysis software is used to analyze the flow field inside the impeller.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

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