消涡梁对立轴旋涡三维水流结构的影响研究  

Effects of eddy-eliminating beam on water flow structure at Bottom water inlet

作　　者：楚志腾 贾栖 Chu Zhiteng;Jia Qi(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;Huadong Engineering Corporation Limited,Hangzhou 310000,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州310000

出　　处：《山西建筑》2021年第3期174-176,共3页Shanxi Architecture

摘　　要：进水口前立轴漩涡会对水工建筑物产生不同程度的危害,需采取工程措施消除漩涡。采用三维数值模拟,基于RNGκ-ε紊流模型和VOF模型,成功模拟出稳定的立轴漩涡,并研究了不同尺寸的消涡梁对吸气漩涡水流结构的影响。模拟结果表明:消涡梁的设置改变了漩涡发生区域的切向速度、径向速度和轴向速度,减小表层水体的涡量,阻断底部螺旋流的向上发展,可以有效消除漩涡并改善进水口前水流流态;消涡梁上方各向流速随消涡梁增大而减小,在底部出水孔处各向流速没有显著变化,消涡梁下方切向流速呈现随消涡梁增大而增大的趋势。为保证消涡效果,并避免局部切向流速过大,建议消涡梁尺寸取漩涡直径的2倍。The vertical axis vortex before the water inlet has different degrees of harm to hydraulic structures,engineering measures need to be taken to eliminate the vortex.This paper uses three-dimensional numerical simulation,based on RNGκ-εturbulence model and VOF model,to study the effect of eddy-eliminating beams of different sizes on the structure of suction vortex flow.the setting of eddy-eliminating beam changes the tangential velocity,radial velocity and axial velocity in the area where the vortex occurs,reduces the vorticity of the surface water body,blocks the upward development of the spiral flow at the bottom,and can effectively eliminate the vortex and improve the flow pattern of the water at water inlet.The all-directional velocity of the water flow above eddy-eliminating beam decreases with the increase of the eddy-eliminating beam,there is no significant change in flow velocity in all directions at the bottom outlet hole,and the tangential flow velocity below the eddy-eliminating beam increases with the increase of the eddy-eliminating beam.In order to ensure the effect of vortex elimination and avoid excessive local tangential velocity,it is recommended that the size of the eddy-eliminating beam be twice the diameter of the vortex.

关 键 词：立轴漩涡 数值模拟 三维流速 消涡梁 涡量 

分 类 号：TV732.1[水利工程—水利水电工程]