水利水电技术2017，Vol.48Issue(2)：89-96,8.DOI:10.13928/j.cnki.wrahe.2017.02.016
水轮机流道非恒定流对过机鱼体影响研究
Impact from unsteady flow in flow passage on fish passing through turbine
摘要
Abstract
In accordance with the background of that the survival rate of the fish passing over dam through the flow passage of turbine is lower,the impact from the unsteady flow in the flow passage on fish passing through turbine is deeply studied herein in combination with CFD numerical simulation technology on the basis of trailing the typical downward route of the juvenile grasscarp passing through a model Kaplan turbine with the relevant video analysis technique.The result shows that the guide vane closing time during the transient process of hydraulic turbine is correlative to the damage probability of the fish passing through turbine to some extent.Along with the extension of the guide vane closing time,the damage probability of the fish passing downward through turbine caused by pressure is to be decreased,but the probability of the damage caused by pressure gradient is to be increased.With a comprehensive comparison made on the impacts from both the pressure and the pressure gradient on the damage of the fish passing through turbine,it is indicated that the extension of the guide vane closing time is to increase the probability of damage of the fish passing through turbine.Therefore,for the hydropower stations those are necessary to meet the demand from fish passing through turbine,the guide vane closing time must be properly decreased for protecting fish safely passing through turbine.The study result can provide a reference for the optimal operation of turbine to decrease the damage probability of the fish passing through turbine.关键词
水轮机/水力机械/非恒定流/CFD数值模拟/草鱼幼鱼/试验Key words
hydraulic turbine/hydraulic machinery/unsteady flow/CFD numerical simulation/juvenile grass carp/experiment分类
建筑与水利引用本文复制引用
张洋,王煜,戴会超..水轮机流道非恒定流对过机鱼体影响研究[J].水利水电技术,2017,48(2):89-96,8.基金项目
国家自然科学基金(51409151) （51409151）
