叶片数及叶片厚度对混流泵性能的影响  

Effects of blade number and thickness on performance of mixed-flow pumps

作　　者：邴浩[1] 谭磊[2] 曹树良[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]清华大学摩擦学国家重点实验室,北京100084

出　　处：《水力发电学报》2013年第6期250-255,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(51176088);中国博士后科学基金面上资助项目(2011M500315)

摘　　要：在其他几何参数均给定的条件下,通过改变叶轮叶片数与导叶数以及两者的组合、叶轮叶片厚度及其沿轴面流线的分布规律,设计了一系列混流泵。基于雷诺平均N-S方程和标准k-ε模型,采用SIMPLE算法模拟了该系列混流泵内部的静压与总压分布情况,获得了混流泵的水力效率,分析了导叶数、叶轮叶片数及厚度及等参数对混流泵水力性能的影响。结果表明:叶轮叶片数以及叶片数与导叶数的组合对混流泵性能影响十分显著,叶轮叶片数Z1的选择需要考虑其对做功能力与流动损失的综合影响,Z1确定后,通常选取导叶数Z2=Z1+1即可满足转换部分动能为压能与消除环量的要求;叶片厚度及其沿轴面流线的分布规律对混流泵性能的影响并不明显,在满足叶片结构强度的前提下,适当选取较小的叶片厚度,并使最大厚度位于轴面流线中部,可确保混流泵具有较好的性能。With the other geometric parameters fixed, a series of mixed-flow pumps were designed under different conditions of the impeller blade number, the diffused vane number, the combination of the blade and vane numbers, the impeller blade thickness and its distributions along meridional streamlines. Based on Reynolds averaged N-S equations and standard k-ε equation, SIMPLE algorithm was employed to simulate the distributions of static pressure and total pressure in the mixed-flow pumps. In addition, the hydraulic efficiencies were calculated and the effects of the diffuser vane number, the impeller ,blade number and the blade thickness on the hydraulic performances of mixed-flow pumps were analysed. The results have shown that, （i） the impact of the impeller blade number and the combination of the blade and vane numbers on the performance of the mixed-flow pump was quite significant. The selection of impeller blade number Zl should consider the comprehensive effects of Z1 on both the power converting capability and the flow loss. After determining Z1 , the diffuser vane number Z2 was generally determined referring to Z2 = Z1 ＋ 1, which could satisfy the requirments of energy conversion and circulation elimination of diffuser vane. （ii） The impeller blade thickness and its distributions along meridional streamines were the factors having insignificant influences on the performances. Based on the premise of having satisfied the blade structural strength, selecting a smaller blade thickness and keeping the maximum blade thickness in the middle of meridional streamline could lead to better performance of the mixed-flow pump.

关 键 词：水力机械 混流泵 叶片数 叶片厚度 数值模拟 水力性能 

分 类 号：TH313[机械工程—机械制造及自动化]