中比转速无过载多级离心泵的叶轮设计方法  

A Novel Design Method for Impeller of Medium Specific Speed Non-Overload Multistage Centrifugal Pumps

作　　者：马艺[1,2] 马中强 张生昌[1,2] 张志鸿[1] 范卫钢 王金泉 

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]过程装备及其再制造教育部工程研究中心,杭州310014 [3]江苏双达泵阀集团有限公司,江苏靖江214537

出　　处：《上海交通大学学报》2015年第5期695-701,共7页Journal of Shanghai Jiaotong University

基　　金："十二五"国家科技支撑计划项目(2013BAF01B01)资助

摘　　要：为达到中比转速多级离心泵无过载性能的要求,在无过载理论的基础上,根据速度系数法推导出新的中比转速多级离心泵叶轮的无过载设计公式,设计了比转速为89.3和135.0的多级泵叶轮,利用Fluent软件进行模拟计算,并与传统公式所设计的泵叶轮进行对比分析.结果表明:在2个设计实例中,采用所推导的公式设计的叶轮轴功率曲线均出现极大值,功率备用系数K分别为1.13和1.03,从而验证了所推导公式的准确性;与采用传统公式相比,采用所推导的公式设计的2种泵的扬程分别提高了14.0%、7.5%,效率分别提高了2.68%、1.03%,而且能够保证较小的径向尺寸;推导的公式较适用于中比转速无过载多级离心泵的叶轮设计.To meet the demand of the non-overload characteristic of medium specific speed multistage cen- trifugal pumps, a formula for the design of impeller was derived by using empirical correlations, based on the theory of non-overload. Two pumps, the specific speeds of which were 89.3 and 135.0, were designed using this formula and the traditional formula, and the performance curves were obtained using Fluent. The results indicate that the extreme point of shaft power curve appeares in both of the pumps designed using the derived formula, and the coefficient K, the ratio of the maximal axle power to the power in designed working condition are 1.13 and 1.03, validiting the derived formula. Compared with the pumps designed using the traditional formula, the head of the pumps designed using the derived formula increases by 14.0% and 7.5%, and the efficiency increases by 2.68% and 1.03%. Meanwhile the radial dimension becomes smaller. The derived formulas can be used for medium specific speed non-overload multistage cen- trifugal pumps.

关 键 词：中比转速 多级 离心泵 叶轮 无过载 

分 类 号：TH311[机械工程—机械制造及自动化]