基于CFD技术的150S-50双吸离心泵性能预测和节能优化

发布时间：2018-04-11 21:13

  本文选题：双吸离心泵 + CFD　； 参考：《浙江工业大学》2011年硕士论文

【摘要】：能源的日益紧张对离心泵的研究和制造提出了新的要求,离心泵不仅需要适应越来广泛的应用领域,还需要适应越来越严格的节能要求,这就要求离心泵在研究、设计和制造等环节中有新的突破。进入21世纪一来,计算流体动力学(Computational Fluid Dynamic, CFD)技术在模拟离心泵内部流动中得到了广泛和有效的应用。将CFD技术和优化设计方法结合起来,能够大大提高产品的研发周期以及提高产品的性能,这已成为一个热门的发展方向。 本文的主要工作和成果如下： 1.对CFD数值模拟技术及其在离心泵设计中的应用概况、以及离心泵的优化设计方法的研究现状进行了总结。 2.使用Pro/e软件对150S-50双吸离心泵三维水力模型建立模型,运用Gambit对模型进行网格划分。在分析比较数值模拟中常用的湍流模型和计算方法后,选择最适合本文模型的数值模拟设置,利用Fluent对模型进行了整机非定常数值模拟。 3.通过Fluent的模拟结果,对150S-50双吸离心泵进行性能预测并对叶轮流场、蜗壳流场和气蚀情况进行了分析,验证所选数值模拟方法的可行性。 4.在总结文献的基础上,提出了泵的优化方案。在优化过程中,分析已有的机械损失、容积损失和水力损失的经验公式,选择对本文模型预测最准确的一组公式。接着以离心泵总效率为优化目标函数,以五个叶轮的设计参数为自变量,推导出总效率和叶轮各个设计参数之间的函数关系。 5.利用Matlab,分析效率与比转数、扬程之间的函数关系。使用遗传优化方法,求出总效率的最大值和新的叶轮设计参数,从理论上计算出总效率提升了1.65%。重新建立三维水力模型,并再次使用非定常数值模拟方法对优化方法进行了验证。结果表明：优化后的泵在标准工况下总效率提升1.67%,实现了优化目的标,达到了节能目的。
[Abstract]:The increasing strain of energy has put forward new requirements for the research and manufacture of centrifugal pumps. Centrifugal pumps need not only to adapt to more and more extensive application fields, but also to adapt to more and more stringent requirements for energy saving, which requires the research of centrifugal pumps.There are new breakthroughs in design and manufacturing.In the 21st century, Computational Fluid dynamic (CFDs) technology has been widely and effectively applied to simulate the internal flow of centrifugal pumps.The combination of CFD technology and optimization design method can greatly improve the product research and development cycle and improve the performance of the product, which has become a hot development direction.The main work and results of this paper are as follows:1.This paper summarizes the CFD numerical simulation technology and its application in centrifugal pump design, as well as the research status of the optimization design method of centrifugal pump.2.The 3D hydraulic model of 150S-50 double suction centrifugal pump is built by Pro/e software, and the model is meshed by Gambit.After analyzing and comparing the turbulence models and calculation methods commonly used in numerical simulation, the most suitable numerical simulation settings for this model are selected, and the unsteady numerical simulation of the model is carried out by using Fluent.3.Based on the simulation results of Fluent, the performance of 150S-50 double suction centrifugal pump is predicted, and the blade rotation field, volute flow field and cavitation erosion are analyzed to verify the feasibility of the numerical simulation method.4.On the basis of summarizing literature, the optimization scheme of pump is put forward.In the process of optimization, the empirical formulas of mechanical loss, volume loss and hydraulic loss are analyzed, and the most accurate set of formulas for the prediction of this model are selected.Then, taking the total efficiency of centrifugal pump as the optimization objective function and the design parameters of five impellers as independent variables, the functional relationship between the total efficiency and the design parameters of impeller is deduced.5.The function relationship among efficiency, specific rotation number and head is analyzed by Matlab.The maximum of total efficiency and new design parameters of impeller are obtained by using genetic optimization method, and the total efficiency is increased by 1.65% theoretically.The 3D hydraulic model was reestablished and the unsteady numerical simulation method was used to verify the optimization method.The results show that the total efficiency of the optimized pump is improved by 1.67 in the standard working condition, the optimization goal is realized and the energy saving is achieved.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

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