分流叶片对液力透平压力脉动的影响  

Influence of Splitter Blades on Pressure Fluctuation of Hydraulic Turbine

作　　者：史凤霞[1] 赵广彪 唐玉财 SHI Feng-xia;ZHAO Guang-biao;TANG Yu-cai(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,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

出　　处：《水电能源科学》2024年第10期162-166,210,共6页Water Resources and Power

基　　金：甘肃省基金项目(20JR5RA477);甘肃省教育厅高校教师创新基金项目(2024A-021);甘肃省杰出青年基金(20JR10RA203)。

摘　　要：为揭示分流叶片对低比转速液力透平性能的影响,以一台低比转速离心泵(n_(s)=33)反转作液力透平为例,设计出4种不同分流叶片数的叶轮(复合叶轮),通过CFX软件对原始叶轮和4种复合叶轮进行数值模拟并对比分析。结果表明,4种新模型在最优工况下效率和水头均有所提高,其中当分流叶片数Z=6+6时液力透平的性能最佳,在最优工况下效率、水头分别提高了2.23%、6.83%;叶轮内压力分布更加均匀;叶轮进口漩涡区域减弱;内部各个监测点压力系数、脉动幅值均小于原始模型,说明分流叶片可以降低液力透平内部的压力脉动、提升透平机组运行的稳定性。研究结果可为低比转速液力透平性能提升提供参考。In order to reveal the effect of splitter blades on the performance of low specific speed hydraulic turbine,this paper chooses a low specific speed centrifugal pump(n_(s)=33)reversed for hydraulic turbine as the research object,and designs four kinds of impellers with different number of splitter blades(composite impeller).Numerical simulation and comparative analysis of the original impeller and four kinds of composite impellers are carried out by CFX software.The results show that the four new models have improved efficiency and head at optimal working conditions,among which the performance of the hydraulic turbine is the best when the number of splitting blades Z=6+6,and the efficiency and head increase by 2.23%and 6.83%,respectively at the optimal operating conditions;The pressure distribution inside the impeller is more even;The vortex area of the impeller inlet is weakened;The pressure coefficient and pulsation amplitude at each monitoring point are smaller than those of the original model,which indicates that the splitting blades can reduce the pressure pulsation inside the hydraulic turbine and improve the stability of the turbine operation.The research results can provide reference for improving the performance of low specific speed hydraulic turbines.

关 键 词：分流叶片 液力透平 低比转速 压力脉动 动静干涉 

分 类 号：TV734[水利工程—水利水电工程] TH311[机械工程—机械制造及自动化]