大口径三偏心蝶阀关闭过程内部流场动态仿真  

Dynamic Simulation of Internal Flow Field in Closing Process of Large Diameter Tri-eccentric Butterfly Valve

作　　者：刘惺 何庆中 赵献丹 王佳 廖伯权 Liu Xing;He Qingzhong;Zhao Xiandan;Wang Jia;Liao Boquan(Sichuan University of Science&Engineering,Yibin 644000,China)

机构地区：[1]四川轻化工大学机械工程学院

出　　处：《流体机械》2019年第10期42-46,共5页Fluid Machinery

基　　金：四川省教育厅创新团队项目(17TD0026);四川理工学院研究生创新基金项目(y2018029)

摘　　要：为了给大口径三偏心蝶阀的设计与选型提供一定的技术支撑,针对某水电站使用的DN3400大口径三偏心蝶阀在关闭过程中流场不稳定问题,文章采用FLUENT动网格与用户自定义函数UDF相结合,分析出了三偏心蝶阀的内部流场变化规律以及不同关阀速度对碟板的动水压强的变化规律。结果表明,蝶阀在关闭过程中其内部流场从稳流转变为湍流,且随着阀门关闭过程的进行,涡街效应逐渐增大;此外,适当的关阀速度能够有效的减小动水压强,特别是6 s<t<10 s时,动水压强相比4 s时减小30%左右。In order to provide a technical support for the design of hydraulic system and type selection of hydraulic components for large-diameter tri-eccentric butterfly valves,in view of the unstable flow field of DN3400 large-diameter tri-eccentric butterfly valves used in a hydropower station in the closing process,by combining the FLUENT dynamic grids with user-defined function UDF,the variation law of internal flow field was analyzed and variation law of hydrodynamic pressure of disc plate with different closing speed was also discussed.The results show that the internal flow field of the butterfly valve changes from steady flow to turbulent flow during the closing process,and the vortex street effect increases gradually with the closing process of the valve.In addition,the appropriate closing speed can effectively reduce hydrodynamic pressure,especially,when 6 s<t<10 s,hydrodynamic pressure is reduced by about 30%compared with 4 s.

关 键 词：三偏心蝶阀 动网格 关闭特性 动水压强 涡街效应 

分 类 号：TH138[机械工程—机械制造及自动化]