低比转速离心泵叶轮的水力设计数值方法  

Hydraulic design of low specific speed centrifugal pump impeller by numerical method

作　　者：周鑫[1] 张永学[1] 姬忠礼[1] 江翠伟[1] 

机构地区：[1]中国石油大学机械与储运工程学院,北京102249

出　　处：《中国石油大学学报（自然科学版）》2011年第4期113-118,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金青年基金项目(50809075);北京市重点学科资助项目

摘　　要：低比转速离心泵叶轮因扬程高、流量小、流道长而使内流状态复杂,其水力设计普遍采用基于相似理论的方法,叶轮水力性能高度依赖叶轮模型和设计者的经验。综合考虑相似理论设计经验成熟和叶轮空间流动理论设计的优势,采用二元流动理论,应用准正交线法绘制轴面流网,结合欧拉能量方程,进行轴面速度的迭代计算,根据轴面速度的分布要求,不断优化轴面流道轮廓,用贝塞尔曲线对叶片头尾部进行修圆,依据该方法编制的程序完成比转速为67的叶轮水力设计。结果表明:通过对相关参数的调整可实现低比转速离心泵叶轮的快速设计,设计所得叶片表面数据齐全,便于数控机床加工制造,还可结合各种优化程序对叶轮进行优化设计。Considering the complexity of the flow state with high head,low capacity and long passage,the hydraulic design of low specific speed centrifugal pump impellers was based on similarity theory and its hydraulic performance is highly dependent on the model of impeller and experience of designer.A numerical method was put forward combining the advantages of similarity theory design and 2D theory design,adopting quasi-orthogonal method and Euler energy equation to calculate meridional velocity distribution,adjusting the meridional profile according to the cross section area,drawing blade shape by point-by-point integration method,thickening blade and smoothing leading edge of blade by using Bezier curve.The design of the impeller（specific speed of 67） was completed.The results show that the low specific speed centrifugal pump impeller design can be achieved through the adjustment of parameters,and the design data from the blade surface is complete.It is easy to process and manufacture the numerical control machine tools.The design of the impeller can be optimized using various optimization program.

关 键 词：低比转速 离心泵叶轮 二元理论 轴面轮廓 贝塞尔曲线 设计 

分 类 号：TH311[机械工程—机械制造及自动化]