摘要
采用CFD方法和带旋修正的κ-ε模型对水平面上普通城门洞形隧洞弯段断面进行三维数值模拟,分析了二次流对普通城门洞形隧洞弯段断面动能修正系数的影响。结果表明,普通城门洞形隧洞弯段形成了一对反向不对称的二次流,上部螺线形流线区域对动能修正系数值有决定性作用,形成的环形流线区域和梯度越大,动能修正系数越小;大曲率弯段断面动能修正系数值大于小曲率弯段断面动能修正系数值;弯段中的二次流引起流速的重分布,对弯段断面动能修正系数值有削减作用。
In order to study the influence of secondary flow on bend-shaped tunnel with standard city gate-shaped section,three-dimensional model was numerically simulated by CFD using realizableκ-εmodel.The results show that there is a pair of inverted transverse circulation in the standard city gate-shaped section,and the kinetic energy correction factor depends on the spiral streamline of the top half of transverse circulation.With the greater formed vortex area and gradient is,smaller the kinetic energy correction factor is.Kinetic energy correction factor is larger on the section with greater curvature than the one with smaller.Secondary flow leads to the velocity re-distribution and the decrease of the kinetic energy correction factor.
出处
《水电能源科学》
北大核心
2015年第1期91-95,共5页
Water Resources and Power
基金
国家自然科学基金项目(90610027
51079051)
关键词
普通城门洞形隧洞弯段
二次流
动能修正系数
流速分布
bend-shaped tunnel with standard city gate-shaped section
secondary flow
kinetic energy correction factor
velocity distribution
