双蜗壳隔板设计参数对离心泵外特性和径向力特性的影响  

Effect of double-volute design parameters on impeller hydraulic and radial force characteristics of centrifugal pump

作　　者：董志强 DONG Zhiqiang(KSB Shanghai Pump Co.,Ltd.,Shanghai 200245,China)

机构地区：[1]上海凯士比泵有限公司,上海200245

出　　处：《排灌机械工程学报》2023年第10期988-992,1006,共6页Journal of Drainage and Irrigation Machinery Engineering

摘　　要：为了阐释隔板起点位置、终点位置及二者匹配关系对离心泵外特性和径向力特性的影响,文中提出6种研究方案,借助仿真软件CFX分别对每种方案进行全流道稳态模拟,进而获得离心泵内部流动状态、机组外特性及径向力参数,并对部分方案进行水力性能测试以验证计算准确性.研究结果表明:最优隔板模型起点位置与隔舌相隔180°,终点位置与起点位置处于同一径向平面,该模型能兼顾离心泵的外特性及径向力特性;离心泵外特性对隔板起点位置不敏感,在理想隔板模型起点位置基础上,将隔板起点与隔舌之间角度额外增加30°,外特性变化最大偏差均小于2%;隔板长度随着隔板终点位置向蜗壳出口的移动而增加,这对小流量工况下离心泵内部流态具有一定整流作用,外特性曲线表现出小流量变优、大流量变差的特点,曲线形状趋于陡峭;隔板起点、终点偏于最优模型时,蜗壳平衡径向能力呈下降趋势,但均优于单蜗壳.研究结果可以为解决小基圆蜗壳因空间狭小难以实现双蜗壳设计提供参考.In order to explain the influence of the starting and ending positions of the partition and their matching relationship on the radial force and the hydraulic characteristics of the centrifugal pump,six research schemes were proposed,and the full channel steady-state simulation was carried out for each scheme with the help of CFX simulation software.Then,the internal flow state of the centrifugal pump,the hydraulic characteristics of the unit and the radial force parameters were obtained.In order to verify the accuracy of the calculation,hydraulic performance tests of some schemes were conducted.The results show that:for the optimal model,the starting position of the partition and the tongue are separated by 180°,and the ending position of the partition and the starting position are in the same radial plane,and this model can take into account the hydraulic characteristics and radial force characteristics of the centrifugal pump.Since the hydraulic characteristics of the centrifugal pump are not sensitive to the starting position of the partition,based on the starting position of the ideal partition model,the angle between the starting point of the partition and the tongue is increased by an additional 30°,and the maximum change of the hydraulic characteristics is less than 2%.The length of the partition increases as the ending position of the partition moving to the outlet of the volute.This has a certain rectification effect on the internal flow pattern of the centrifugal pump under small flow conditions,resulting in the hydraulic characteristic becoming better for small flow conditions and worse for large flow conditions,while the hydraulic characteristic curve shape tends to be steep.When the starting and ending positions of the partition plate deviate from the optimal model,the radial balance capacity of the volute decreases,but it is better than that of the single volute.The research results can provide a reference for solving the problem of small-base circular volutes,which is difficult to achieve the dou

关 键 词：离心泵 双蜗壳 隔板设计 径向力 外特性 

分 类 号：S277.9[农业科学—农业水土工程] TK711[农业科学—农业工程]