基于CFD的底部上翘角度对直管式出水流道水流性能的影响研究  

Research on the Influence of the Bottom Upturn Angle on the Water Flow Performance of the Straight-pipe Outlet Channel Based on CFD

作　　者：孙晨光 王芳芳[1] 高昂 罗洁 陆伟刚 SUN Chen-guang;WANG Fang-fang;GAO Ang;LUO Jie;LU Wei-gang(State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,Jiangsu Province,China;Yangzhou University,Yangzhou 225009,Jiangsu Province,China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029 [2]扬州大学,江苏扬州225009

出　　处：《中国农村水利水电》2023年第1期164-170,175,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金(51909169);江苏省基础研究计划(自然科学基金)项目(BK20190142)。

摘　　要：为优化直管式出水流道的设计型式,以通吕运河大型低扬程泵站为例,建立几何比尺为11的三维泵装置模型,选用六面体结构化网格划分计算域,并进行全流道定常数值计算,探究了不同底部上翘角度对直管式出水流道水流性能的影响。结果表明,底部水平时,直管式出水流道水流性能一般,对内流流动的调整作用不明显;随着底部上翘角度的增大,出水流道水力性能呈先优后劣的变化趋势,存在水力性能最优的阈值角度,为1.5°;当底部上翘角度为阈值角度时,出水流道前段的涡通量降幅明显,后段流速均匀度最高。不同的底部上翘角度对直管式出水流道的水流性能有着较大影响,采用合适的底部上翘角度能够提高出水流道的水力性能,增强对水流的调整作用。研究成果为直管式出水流道的水力设计提供了一定的参考。In order to optimize the design type of the straight pipe outlet channel,this paper establishes a three-dimensional pump device model which geometric scale is 11 bytaking Tonglvlarge low lift pump stationpumping sub-station as an example, uses hexahedral mesh divides the calculation domain, and calculates the full flow channel with steady flows. The numerical calculation is carried out to explore the water flow performance of the outlet channel with different bottom upturn angles. The calculation results show that the hydraulic performance of the bottom horizontal outlet channel is relatively general, and the adjustment effect on the internal flow is not obvious.With the increase in the upturning angle of the bottom, the hydraulic performance of the outlet channel shows a trend of first priority and then gets worse. There is a threshold angle for the optimal hydraulic performance, which is 1.5°. When the upturn angle is the threshold angle,the eddy flux in the front section of the outlet channel has a significant decrease, and the flow velocity uniformity in the rear section is the highest.Different bottom upturn angles have a great influence on the water flow performance of the straight pipe outlet channel. Using a suitable bottom upturn angle can improve the hydraulic performance of the outlet channel, enhance the water flow adjustment.The research results provide a certain reference for the hydraulic design of the straight-pipe outlet channel.

关 键 词：出水流道 底部上翘角度 数值模拟 水力性能 涡通量 流速均匀度 

分 类 号：TV675[水利工程—水利水电工程]