双叶片半开式潜污泵叶顶间隙对内部流动特性的影响  

The Effect of the Blade Tip Clearance on the Internal Flow Characteristics of the Double-blade Semi-open Impeller Submersible Sewage Pump

作　　者：曾浪令 赖喜德 陈小明 叶道星 宋冬梅 廖功磊 ZENG Lang-ling;LAI Xi-de;CHEN Xiao-ming;YE Dao-xing;SONG Dong-mei;LIAO Gong-lei(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China;Sichuan Mechanical Design and Research Institute,Chengdu 610063,China)

机构地区：[1]西华大学能源与动力工程学院,成都610039 [2]四川省机械设计研究院,成都610063

出　　处：《中国农村水利水电》2022年第5期51-56,共6页China Rural Water and Hydropower

基　　金：四川省科技计划项目(2020ZHCG0018);2020年四川省工业发展资金项目。

摘　　要：为研究叶顶间隙对潜污泵水力性能和流动稳定性的影响,以某双叶片半开式叶轮潜污泵为研究对象,将叶顶间隙作为设计变量,进行全流道固液两相流数值模拟计算,分析间隙对该泵的外特性影响以及对叶轮内固相、压力、速度以及泄漏涡的分布影响。结果分析表明:间隙对泵内流动特性影响很大,相对叶顶间隙由0.58%扩大至1.74%时,小流量工况下扬程明显降低,最优效率点具有向小流量工况偏移的趋势;固相颗粒分布向叶轮内集中,输送固相颗粒的性能降低;叶轮流道内压力分布规律呈压力梯度减小,局部低压区向出口方向偏移的特点;随着相对叶顶间隙增大叶轮内轴向漩涡逐渐加剧,在相对叶顶间隙1.16%时发展到较为剧烈;泄漏涡尺寸逐渐增大,在1.74%时出现细长的泄漏涡带。In order to study the influence of the tip clearance on the hydraulic performance and flow stability of the submersible sewage pump,a double-blade semi-open impeller submersible sewage pump is taken as the research object,taking the tip clearance as the design variable to perform numerical simulation of solid-liquid two-phase flow in the whole passage,and the influence of the clearance on the external characteristics of the pump and the distribution of the solid phase,pressure,velocity and leakage vortex in the impeller are analyzed.The results show that the clearance has a great influence on the flow characteristics in the pump.When the relative tip clearance expands from 0.58%to 1.74%,the head significantly decreases under the low flow rate condition,and the optimal efficiency point tends to shift to the low flow condition.The solid particles are concentrated in the impeller,resulting in a decrease in the performance of conveying solid particles.At the same time,the pressure distribution law in the flow passage of the impeller is characterized by a decrease in pressure gradient and deviation of the local low pressure area toward the outlet direction.With the increase in the relative tip clearance,the axial vortex in the impeller gradually intensifies,and it develops to be more severe when the relative tip clearance is 1.16%.As the size of the leakage vortex gradually increases,and a slender leakage vortex appears when it is 1.74%.

关 键 词：潜污泵 固液两相 叶顶间隙 泄漏涡 

分 类 号：TH311[机械工程—机械制造及自动化]