低弗劳德数宽尾墩多级消力池三维数值模拟

低弗劳德数二元水跃消能效率低,当无尾坎消力池受地形限制,其长度较短且下游水位较低时水跃无法稳定在消力池内,消力池下游护坦承受较大冲刷压力,甚至护坦出口水流余能对下游河床造成严重冲刷。对此,提出采用宽尾墩联合尾坎消力池来改善消能效果,并采用RNG κ-ε紊流模型结合自由面追踪的VOF方法对宽尾墩联合尾坎消能工的水流流场进行三维数值模拟,通过宽尾墩与平尾墩、设置尾坎与不设置尾坎的综合对比分析得出,采用宽尾墩联合尾坎消能工的消能体型可有效调控水流并提高水流的消能效率,明显改善消力池内水流流态,有效减少对护坦及下游河岸冲刷。研究成果可为类似工程提供借鉴。

Three Dimensional Numerical Simulation of Multistage Stilling Basin with Flaring Gate Piers at Low Froude Number Condition

The energy dissipation efficiency by hydraulic jump is low at low Froude number. When the stilling basin without end sill is restricted by terrain, its length is short. At the same time, when the downstream water level is low, stable hydraulic jumps cannot be formed in the stilling basin. To address the above problems, this paper presented a novel type of energy dissipator-flaring gate piers combined with end sill to improve the energy dissipation performance. RNG κ-ε turbulence model combined with VOF method was utilized to investigate the three-dimensional flow field in the energy dissipation basin with different configurations. The comprehensive comparative analysis suggested that the energy dissipation and flow pattern for the configuration with flaring gate pier and end sill can be effectively improved, hence reducing the scour of apron and river banks. The research results can provide reference for the similar projects.