数值模拟对比研究微挑消力池水力特性

Comparative numerical simulation of hydraulic characteristics of deflecting stilling basin

为研究"微挑消力池"水力特性,本文采用三维RNG k-ε紊流模型对其及反弧消力池、跌坎消力池、陡坡消力池进行了数值模拟,对比分析了微挑消力池的水面线、流场结构、临底流速、出池流速及时均压力、动水压力分布等的特点;研究结果表明,微挑消力池入池段"微挑"的体型特征,使有限的结构空间得到较充分的水体紊动,底流入池方向有利,临底流速衰减较快。

Numerical simulation of 3D turbulent flow with a RNG k-ε model was conducted to study stilling basins with different inlet design schemes of deflecting arc,conventional arc,step_down and steep slope,including a detailed comparison of free surface elevation,velocity field,velocity on the slab,outflow velocity,pressure distribution and dynamic pressure distribution.The results show that the deflecting arc scheme is better than the other three schemes and that the deflecting stilling basin（DSB） has more turbulent flow in the limited basin space,more favorable inflow pattern and greater rate of velocity decay along the bottom slab.