喷管结构对环形射流泵流场的影响  

Influence of Jet Pipe Structure on Flow Field of Annular Jet Pump

作　　者：熊顺 陈云良[1] 向伟宁 徐永[1] XIONG Shun;CHEN Yun-liang;XIANG Wei-ning;XU Yong(State Key Laboratory of Hydraulics and Mountain River Engineering,School of Water Resources and Hydropower,Sichuan University,Chengdu 610065,Sichuan Province,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室、水利水电学院,四川成都610065

出　　处：《中国农村水利水电》2023年第10期121-128,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51879179)。

摘　　要：为探究喷管结构对环形射流泵流场的影响,对喷管直角转弯与弧形转弯两种条件下的环形射流泵进行了数值模拟研究,对环形喷嘴出口直段开展计算分析。结果表明:喷管直角转弯时流场在喷嘴、喉管和扩散管环周分布不均,喷管弧形转弯时环形喷嘴形成均匀射流,有利于工作液与被吸液的均匀、对称混合及传能,各流量比工况下压力比及效率均有所提升。环形喷嘴出口设置(0.5~1)倍出口宽度的直段可改善环形射流泵的性能,在中低流量比时效率最高可提升1%;同时,直段有助于平稳喷嘴出口的压力,减小喉管入口附近回流区的范围和压降的幅度。研究成果可为环形射流泵全域流场分析、喷管结构设计提供依据和支撑。In order to explore the influence of jet pipe structure on the flow field of annular jet pump,three-dimensional numerical simulation of annular jet pump under right-angle turn and arc turn was carried out,and the straight section of annular nozzle outlet was calculated and analyzed.The results show that the flow field is unevenly distributed around the nozzle,throat and diffuser in the jet pipe with right-angle turn.The annular nozzle forms a uniform jet in the jet pipe with arc turn,which is conducive to the uniform and symmetrical mixing and energy transfer between the primary flow and the secondary flow,so that the pressure ratio and efficiency are improved under each flow ratio.The performance of the annular jet pump can be improved by setting(0.5~1)times the outlet width of the straight section at annular nozzle outlet,and the efficiency can increase by 1%at the middle and low flow ratio.At the same time,the straight section helps to stabilize the pressure at the nozzle outlet and to reduce the range of the recirculation area near the inlet of the throat and the extent of the pressure drop.The research findings serve as a support for the analysis of the overall flow field of annular jet pump and the design of jet pipe structure.

关 键 词：环形射流泵喷嘴 数值模拟 直段长度 压力 效率 

分 类 号：TH38[机械工程—机械制造及自动化]