多级轴流泵内叶轮时序效应数值模拟  

Numerical simulations on clocking effect of impeller-stator in multistage axial-flow pump

作　　者：符恒[1] 卢金玲[1] 陈楠[1] 冯建军[1] 陈森林[1] 罗兴锜[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《排灌机械工程学报》2016年第11期934-940,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51279160;51179152;51339005);高等学校博士学科点专项科研基金资助项目(20126118130002)

摘　　要：为研究多级轴流泵内转子时序效应对水泵性能影响,以首、次级叶轮相对角度θ为0°时作为基准,将次级叶轮沿叶轮旋转方向,每9°旋转为一个时序位置,在不同时序位置时用CFD方法对多级泵内流动进行三维非定常数值计算,并对不同时序位置处压力脉动以及叶片载荷分布进行分析.结果表明:以时序位置θ为0°的计算结果作为基准,时序位置θ为36°时泵扬程变化最大为4.6%,此时效率变化率达到1.2%;首级叶轮出口压力脉动幅值和相位受压力脉动影响有微小波动,其中首级叶轮出口压力脉动幅值最大减小16.31%;次级叶轮出口压力脉动幅值、平均时域值、相位都受到一定程度影响,此时压力脉动幅值最大增长48.27%,平均时域值增长1.34%;次级叶轮压力载荷分布,不同时序位置处载荷分布规律相同,时序位置为9°时的叶片上载荷分布明显高于其他时序位置时叶片上载荷分布.In order to study influences of clocking effect of impeller-stator on the performance of multistage axial-flow pump,unsteady flows in a multistage axial-flow pump are simulated numerically by using CFD method. In the simulations,different clocking positions of a blade leading edge in the second stage impeller relative to the blade leading edge in the first stage impeller are investigated. In the reference case,the angle between two blade leading edges is 0°,and then in the following four cases,this angle is increased by a 9° increment. The pressure fluctuation and pressure loading on blade surfaces are analyzed. It is shown that the maximum variation in the pump head is 4. 6% at the clocking position of 36°,but the efficiency is just with a change of 1. 2% compared with the reference case. At the first stage impeller outlet,the pressure pulsation amplitude and phase have a small fluctua-tion. The maximum reduction of the pressure pulsation amplitude at the first stage impeller outlet is 16. 31%,while the pulsation amplitude,whose average value in time domain and phase at the second stage impeller outlet are affected in a certain degree,causing a 48. 27% increasing in the pressure pulsation ampli-tude and a 1. 34% rise in its average value. The pressure loading distribution profiles on the second impeller blade surfaces remain nearly identical at different clocking positions. However,the loading distribution in the case,where the angle between two blade leading edges are 9°,are obviously higher than the other clocking positions.

关 键 词：多级轴流泵 时序效应 压力脉动 叶片载荷 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程]