溢洪道挑流坎对消力池内过饱和气体的影响分析

Analysis of Impact of Spillway Defectors on Supersaturated Gas in Still Basin

消力池中过饱和气体的浓度通常与包括溢洪道射流流态在内的多种影响因素有关。为了得到溢洪道射流流态与溢洪道结构之间的关系,在采用室内物理模型试验分析各种溢洪道流态的基础上,基于气体向气泡界面和水体表面传质的机理,通过建立三维两相流数学模型,模拟分析了不同溢洪道结构对消力池内饱和气体的影响。结果表明,溢洪道挑流坎可大幅降低消力池中的过饱和气体浓度。

The concentration of supersaturated gas in still basin is relevant with many influencing factors including jet flow pattern. Based on the analysis of four spillway deflectors flow patterns with indoor physical model test, an unsteady three-dimensional （3D） two-phase flow computational fluid dynamics （CFD） model was developed to predict the flow pat- terns and compare the hydrodynamics and TDG distribution of the spillway downstream with and without deflectors. The adjustments of the deflector structures are proved to decrease the TDG.