改善二线船闸下游引航道口门区流态的补流措施研究

Supplementary flow measures to improve flow pattern at entrance area of downstream approach channel of second ship lock

针对闸门开启方式对枢纽下游引航道口门区水流特征及通航水流条件的影响,以湘江近尾洲枢纽二线船闸为例,建立可以较好模拟复杂河道边界条件的二维水流数学模型,在充分认识常规设计泄流开闸方式的下游引航道口门区水流条件的基础上,开展多种开闸泄流方式的组合试验研究。结果表明:二线船闸下游引航道口门区的水流受枢纽运行方式影响较大;边孔(22#闸孔)适当补流可增加口门区回流的能量损失,进而减弱口门区回流,同时使纵流、横流也满足规范要求。为保证船舶航行安全,建议该工程在下泄洪水时尽可能采用常规开闸+边孔补流方式。

In view of the influence of the gate opening mode on the flow characteristics and navigation flow conditions of the downstream approach channel entrance area of the junction,taking the second ship lock of Jinweizhou junction in the Xiangjiang River as an example,we build a two-dimensional flow mathematical model that can better simulate the complex river boundary conditions.On the basis of fully understanding the flow conditions of the downstream approach channel entrance area under the conventional design discharge and sluice opening mode,we carry out a combination test study of multiple sluice opening and discharge modes.The results show that the flow at the entrance area of the downstream approach channel of the second ship lock is greatly affected by the operation mode of the junction.The rational arrangement of the side hole(22#sluice hole)can increase the energy loss of the reflux flow at the entrance area,thereby reducing the reflux flow at the entrance area,and at the same time,the longitudinal and transverse flows can also meet the code requirements.To ensure the safety of ship navigation,it is suggested that the project should adopt the mode of the conventional gate opening and side hole improving flow as far as possible when discharging flood.