复杂嵌套网格模型及其在三河闸大修工况泄流流态模拟中的应用

Application of a nested grid hydrodynamic model to discharge pattern simulation overhaul conditions of Sanhe Sluice

针对三河闸启闭系统更新及土建附属工程实施时63扇闸门半侧开启泄流、半侧关闭更换启闭机的方案,构建三河闸枢纽泄流数学模型,采用结构网格疏密嵌套及2D-3D同步嵌套方法对计算区域进行离散。计算结果表明:(a)大修方案将使枢纽上下游产生大范围的回流区,局部单宽流量增大;(b)枢纽上游快活岭对过闸水流流态有重要影响;(c)与闸门全开工况相比,半开工况入闸水流存在明显偏流,北侧泄流时平均入流偏角最大,达到27.35°。根据数值模拟结果提出改善入闸水流流态的建议,为三河闸大修时水闸的调度、运行和管理提供参考。

When the Sanhe Sluice＇s overhaul project was conducted,63 half-open gates were operated for the purpose of simultaneously discharging water and replacing hoists.A 2D-3D coupled model was put forward and the local nested grid method was employed to simulate the flow patterns of the Sanhe Sluice.The results show the following：（a） In this overhaul situation,there is a wide range of recirculation zones in both the upstream and downstream reaches,and the discharge per unit width increases locally.（b） The Kuaihuo Ridge upstream has a significant influence on the inflow pattern.（c） The flow deflection is more severe with half-open gates than with fully opened gates,and the maximum average deflection angle is 27.35° for the northern discharging case.Based on the numerical simulation results,we make some recommendations for improving the flow pattern,which can provide references for operation and management of the Sanhe Sluice in the overhaul project.