【作者】 张振山；

【导师】 王玉昆；

【作者基本信息】 河北工程大学 ， 水利水电工程， 2007， 硕士

【摘要】 实现离心泵的内部湍流流动数值模拟为人们认识和掌握离心泵内部复杂的流动开辟了新途径,这对于离心泵的优化设计、改善离心泵的水力性能而达到增效节能的目的,具有重要的现实意义;实现离心泵内部湍流流动的数值模拟将代替大量的实验,从而可以节省大量的人力物力,同时,基于CFD分析的现代设计方法可以弥补传统设计方法的不足,进而使设计出高效节能的离心泵成为可能,这些都将带来巨大的社会效益和经济效益。本文在总结前人经验的基础上,采用计算软件FLUENT对离心泵进行内部湍流流动的数值模拟,得到不同工况下离心泵内部的速度分布和压力分布,探索离心泵内部的流动规律,并在此基础上进行性能预测,通过计算结果与试验结果的比较验证该软件计算离心泵内部流动的可行性和正确性。本文主要作了以下几方面的研究工作:(1)综述了离心泵内部流动数值模拟的国内外发展现状和商用CFD软件的发展,从控制方程、湍流模型、离散化方法、边界条件等多方面详细介绍了湍流流动数值模拟的理论基础。(2)研究了离心泵过流部件的实体造型方法及网格划分方法,通过比较不同造型方法下生成的计算网格模型的网格特性,探讨了不同造型方法对计算网格模型的影响。(3)介绍了FLUENT环境下的数值计算过程,并对离心泵内部湍流流动进行数植模拟,得到了不同工况下的速度分布和压力分布。通过计算结果多方面的比较分析,揭示了离心泵内部的流动规律,并发现了二次流、旋涡等许多不良的流动现象。(4)利用FLUENT提供的不同计算模型对离心泵设计工况下的内部流动进行数值模拟,通过计算结果,研究了各种计算模型的优缺点。(5)研究了基于数值模拟的性能预测方法,并以此为基础进行离心泵的性能预测,将预测结果与已有的试验测试结果进行分析比较,验证了所采用方法的可行性和正确性,为下一步的离心泵的优化设计提供参考。更多还原

【Abstract】 Realizing numerical simulation of turbulence flow of centrifugal pump inside opens up the new way that people recognize and grasp the complicated flow of centrifugal pump inside,it is of great significance to optimization designing and hydraulic power performance improving of centrifugal pump。Realizing numerical simulation of turbulence flow of centrifugal pump inside can replace lots of experiments so that it saves a number of manpower ,and material resources,at the same time ,modern design method on the basis of CFD analysis can make up the defect of traditional method ,consequently ,it is possible to devise pump of high-efficiency and saving-energy,it will bring enormous social and economical profits。On the basis of concluding past experience,the numerical simulation of the internal turbulence flow of centrifugal pump is carried out on different work conditions。according to velocity distribution and pressure distribution obtained,probing into the internal flow law of centrifugal pump and forecasting performance。Feasibility and accuracy of this software computing the internal flow of centrifugal pump is proved by comparing calculated results and experimental results。The major research work is listed:(1) This paper summarizes present situation of numerical simulation of centrifugal pump internal turbulence flow at home and abroad ,development of commercial CFD software,and introduces theory about numerical simulation of turbulence flow from control equation、turbulence model、discrete method and boundary condition.(2) This paper studies the method of solid model of centrifugal pump and grid generation,probe into the effect of the different solid model to computational grid model according to compare grid quality of computational grid model which is generated at different solid model method。(3)This paper presents the process of numerical simulation in FLUENT。Different velocity distribution and pressure distribution are gained though numerical simulation of turbulence flow of centrifugal pump inside。The paper reveals the internal flow law of centrifugal pump according to the calculated result , and finds much bad phenomenon,such as the eddy flow、secondary flow and so on。(4)This paper studies the advantage and disadvantage of different computational model which is provided by FLUENT according to the result of numerical simulation in different computational model。(5)This paper studies the method of performance prediction on the basis of numerical simulation of centrifugal pump,and predicts the performance of centrifugal pump。Finally,the paper validates feasibility and accuracy of the method adopted by comparing calculated results and experimental results,and provides reference for optimization design of centrifugal pump。更多还原