出口扩散段直径对双向流道泵装置水力性能的影响  

Influence of outlet diffusion section diameter on hydraulic performance of bidirectional flow channel pump device

作　　者：陶贤明 刘红伟 陈运杰 张瑾 李彦军[1] 李亚林[1] TAO Xianming;LIU Hongwei;CHEN Yunjie;ZHANG Jin;LI Yanjun;LI Yalin(National Research Center of Pumps,Jiangsu University,Zhenjiang 212013,China;Jiangsu Province Taihu Lake Area Water Conservancy Engineering Management Office,Suzhou 215128,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]江苏省太湖地区水利工程管理处,江苏苏州215128

出　　处：《人民长江》2025年第4期162-168,185,共8页Yangtze River

基　　金：江苏省水利科技项目(2022018);国家自然科学基金青年项目(51809120)。

摘　　要：为提升大型低扬程双向流道泵装置水力性能,基于流道出口扩散段椭圆型廓设计,结合SST k-ω湍流模型,探讨出口扩散段直径对双向流道泵装置水力性能的影响。通过分别调整出水流道喇叭管的最大直径D_(1)、导水锥的最大直径D_(2),以及同时调整两者,对比了不同直径方案下出水流道的流速均匀度、水力损失及动能回收率等指标的分布规律,并结合熵产理论,揭示了出口扩散段整体直径对双向流道泵装置水力性能的影响规律。研究结果表明:当仅增加喇叭管最大直径D_(1)时,泵装置最高效率出现先增大后减小的趋势,在喇叭管最大直径D_(1)=2.09D_(0)(D_(0)为叶轮直径)时,泵装置效率最高,出水流道水力损失相对初始方案减小了1 cm;当仅增加导水锥最大直径D_(2)时,出水流道水力损失先减小后增大,在导水锥最大直径D_(2)=2.09D_(0)时出水流道的水力损失最小;当喇叭管与导水锥最大直径D_(1)和D_(2)同时增加时,泵装置最高效率逐渐提高,在最大整体直径D_(1)与D_(2)均为2.28D_(0)时获得最高效率值,出水流道水力损失相对初始方案减小了1.8 cm。研究结果可为双向流道泵装置的优化设计提供参考。In order to improve the hydraulic performance of large-scale low-lift bidirectional flow channel pumps,based on the elliptical profile design of the outlet diffusion section of the flow channel,combined with the SST k-ωturbulence model,the influence of the diameter parameters of the outlet diffusion section on the hydraulic performance of a bidirectional flow channel pump was discussed.By adjusting the maximum diameter D_(1)of the horn tube of the outlet conduit,the maximum diameter D_(2)of the water guide cone respectively,and adjusting both at the same time,the distribution rules of the flow velocity uniformity,hydraulic loss and kinetic energy recovery rate of the outlet conduit under different diameter schemes were compared.Combined with the entropy generation theory,the influence of outlet diffusion section diameter on the hydraulic performance of the bidirectional flow channel pump was revealed.The results showed that when only the maximum diameter of the horn tube D_(1)increased,the maximum efficiency of the pump device increased first and then decreased.When D_(1)=2.09 D_(0)(impeller diameter of the pump device),the efficiency of the pump device was the highest,and the hydraulic loss of the outlet channel was reduced by 1cm compared with the initial scheme.When only the maximum diameter of the water guide cone D_(2)increased,the hydraulic loss of the outlet passage decreased first and then increased.When D_(2)=2.09 D_(0),the hydraulic loss of the outlet passage was the smallest.When D_(1)and D_(2)increased at the same time,the maximum efficiency of the pump device gradually increased,and the maximum efficiency of the pump device gradually increased at D_(1)=D_(2)=2.2 D_(0),and the hydraulic loss of the outlet channel was reduced by 1.8cm compared with the initial scheme.The research results can provide reference for the optimal design of the bidirectional flow channel pump device.

关 键 词：出口扩散段 喇叭管 导水锥 双向流道泵 水力性能 

分 类 号：TH312[机械工程—机械制造及自动化]