双孔护镜门闸顶泄流水动力特性与流态特征的三维数值模拟研究

3-D numerical simulation on hydrodynamic performance and flow pattern of discharge flow over top of goggles-shaped gate

江苏南京三汊河河口闸工程采用双孔护镜闸门,为了准确揭示其典型挡水工况下(大闸门关闭,闸顶溢流)闸后水流的水动力特性与流态特征,本文建立了基于时均雷诺方程和RNG k-ε紊流模型方程的封闭模型方程组,对河口闸典型挡水工况的泄流流态进行了三维数值仿真研究。采用非结构化四面体网格和分体网格技术对复杂边界条件下的数值模拟进行优化。计算结果与物理模型试验结果吻合良好,揭示了典型挡水工况下水闸下游水流流态、涡漩结构规律和流速分布特征,对这种新型闸门的安全运行与结构稳定具有重要意义。

A new type of goggles-shaped gate for sluice is adopted for Sanchahe Estuary Sluice Project in Nanjing of Jiangsu Province. In order to correctly find out the hydrodynamic performance and flow pattern of the flow behind the gate under its typical water retaining condition( the gate is closed and discharge water flows over its top),a closed system based on the reynols averaged equations and RNG k-ε turbulence equations is established herein,and then 3-D numerical simulations are made on flow pattern of the discharge flow under the condition of the water retaining of the sluice; in which the numerical simulation under the complicated boundary condition is optimized with the unstructured tetrahedral mesh and the split-type grid technology. The calculation results satisfactorily coincide with those from the relevant physical model experiment,which not only exposes the flow pattern,vortex structure and law,velocity distribution,etc. of the downstream flow of the sluice under the water retaining condition,but also has an important reference value for the safety operation and structure stability of the new type of sluice gate.