上游弯道圆心角对渡槽流动特性的影响研究  

Study on the Influence of Center Angle of Upstream Bend on Flow Characteristics of Aqueduct

作　　者：秦杭晓 赵文龙 贺蔚 张健[1] QIN Hangxiao;ZHAO Wenlong;HE Wei;ZHANG Jian(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024 Jiangsu China;Institute of Water Science,Hohai University,Nanjing 210024 Jiangsu China)

机构地区：[1]河海大学水利水电学院,江苏南京210024 [2]河海大学水科学研究院,江苏南京210024

出　　处：《水力发电》2024年第7期54-58,共5页Water Power

基　　金：国家自然科学基金资助项目(52179062)。

摘　　要：对于含上游弯道的输水渡槽,弯道段水流同时受到了离心力和重力的影响,使其流态变得更加复杂并进而影响渡槽部分的水力性能。基于MIKE仿真软件,建立了南水北调中线某渡槽的水动力模型,模拟了输水过程并通过实测数据对模型进行了验证,对比分析了不同流量工况下弯道圆心角对渡槽水力特性的影响。结果表明,弯道圆心角的增大会使得槽身段两侧流量差不断增大,在整流条件不足时最大流量差可达2.38 m^(3)/s。对于渡槽进口而言,弯道圆心角的增大会扩大进口中墩与两侧槽的水位差,而增长幅度随着入流量的增大而减小。对于渡槽出口而言,圆心角的增大会提升涡街的强度,其对应涡脱落频率逐渐增大,进而影响尾墩流态。For the aqueduct with upstream bend,the flow in the bend section is affected by centrifugal force and gravity at the same time,which makes the flow pattern more complicated and further affects the hydraulic performance of aqueduct.Based on MIKE simulation software,a hydrodynamic model of an aqueduct on the middle route of the South-to-North Water Transfer Project is established to simulate the water transfer process,and the model is verified through the measured data.The influences of the center angle of bend on the hydraulic characteristics of aqueduct under different flow conditions are compared and analyzed.The results show that the flow difference between the two sides of channel increases with the increase of center angle,and the maximum flow difference can reach 2.38 m~3/s when the rectification condition is insufficient.For aqueduct inlet,the increase of center angle will enlarge the water level difference between the inlet pier and the two sides of channel,and the increase range will decrease with the increase of inlet flow rate.For aqueduct outlet,the increase of the center angle will increase the strength of vortex street,and the corresponding vortex shedding frequency will gradually increase,which will affect the flow pattern of tail pier.

关 键 词：弯道 渡槽 圆心角 水力特性 水动力模型 

分 类 号：TV672.3[水利工程—水利水电工程]