引江济淮跌水工程汇流口通航条件三维数值模拟

Three dimensional numerical simulation of navigation condition at confluence of water diversion and fall project from the Yangtze River to the Huaihe River

基于VOF法的RNG k-ε双方程紊流数学模型,对引江济淮工程韩桥跌水工程水流压强特性及下游通航水流流态进行三维数值模拟,对消能效果进行分析评价,并根据原布置方案的流速分布情况以及水流特性,对方案进行调整优化。结果表明:韩桥跌水工程原布置方案,在支流20 a一遇和5 a一遇流量通航工况条件下,汇流口横向流速值均不符合规划值要求,最大横向流速0.46和0.35 m/s;优化后的工程方案消能效果良好,汇流口区域横向流速与回流流速均满足设计要求,5 a一遇不利通航工况和20 a一遇设计通航工况最大横向流速分别为0.13和0.25 m/s,可作为推荐方案。

Based on RNG k-ε two equations turbulence mathematical model of VOF method, we carry out the three-dimensional numerical simulation of flow pressure characteristic and downstream navigable flow pattern of Hanqiao water fall project of the Yangtze River to the Huaihe River diversion project, analyze and evaluate the energy dissipation effect, and optimize the scheme according to the velocity distribution and flow characteristics of the original layout scheme. The results show that in the original layout of the Hanqiao water fall project, under the navigation conditions of 20-year return flow and 5-year return flow of the tributary, the transverse velocities at the confluence do not meet the requirements of the planning value, and the maximum transverse velocities are 0.46 m/s and 0.35 m/s. The energy dissipation effect of the optimized scheme is good. The transverse velocity and reflux velocity in the confluence area meet the design requirements. The maximum transverse velocities under adverse navigation conditions with a 5-year return period and a 20-year return period are 0.13 m/s and 0.25 m/s respectively. The optimized scheme can be used as the recommended scheme.