次级叶轮进口直径变化对多级离心泵水力性能的影响  

The Influence of Secondary Impeller Inlet Diameter Change on Multistage Centrifugal Pump Hydraulic Performance

作　　者：孙泽鹏 王秀勇[1] 龚贤辉 王正港 周建强 SUN Ze-peng;WANG Xiu-yong;GONG Xian-hui;WANG Zheng-gang;ZHOU Jian-qiang(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;China Changsha Canon General Pump Co.,Ltd.,Changsha 410300,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]长沙佳能通用泵业有限公司,湖南长沙410300

出　　处：《液压气动与密封》2024年第2期35-38,共4页Hydraulics Pneumatics & Seals

基　　金：国家自然科学基金(51866009)。

摘　　要：为了提高多级离心泵的水力效率,以次级叶轮的进口直径为优化对象,保持叶片型线的方格网不变,共设计了5组具有不同进口直径的水力优化方案,基于RNG k-ε湍流模型进行定常数值计算,探讨次级叶轮进口直径的变化对多级离心泵水力性能的影响。结果表明:在一定范围内减小叶轮进口直径,能够降低叶轮的扬程与轴功率,但扬程减小的幅度有限,最低扬程仅比最高扬程减小了0.64%,而轴功率的降低幅度比较明显,最小轴功率比最大轴功率降低了1.90%,最终可使叶轮的水力效率提高1.29%,多级离心泵次级叶轮的进口直径存在最佳值,能使泵的水力效率相对较高。In order to improve the hydraulic efficiency of multistage centrifugal pump,taking the inlet diameter of secondary impeller as the optimization object,keeping the grid of blade profile unchanged,a total of 5 groups of hydraulic optimization schemes with different inlet diameters are designed,based on RNG k-εthe turbulence model is used for steady numerical calculation to explore the influence of the change of the inlet diameter of the secondary impeller on the hydraulic performance of the multistage centrifugal pump.The results show that reducing the impeller inlet diameter within a certain range can reduce the head and shaft power of the impeller,but the range of head reduction is limited,the minimum head is only 0.64%lower than the maximum head,while the range of shaft power reduction is obvious,the minimum shaft power is 1.90%lower than the maximum shaft power,and finally the hydraulic efficiency of the impeller can be increased by 1.29 percentage points.The optimum inlet diameter of the secondary impeller of the multistage centrifugal pump can make the hydraulic efficiency of the pump relatively high.

关 键 词：次级叶轮 进口直径 水力优化 数值模拟 多级离心泵 

分 类 号：TH137[机械工程—机械制造及自动化] TH311