不同断面悬浮隧道绕流特性分析  

Analysis on Characteristics of Flow Passing Submerged Floating Tunnels of Different Sections

作　　者：罗刚[1] 周晓军[1] 李登峰[1] 张川[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《铁道学报》2013年第1期115-120,共6页Journal of the China Railway Society

基　　金：国家自然科学基金(10972186);中央高校基本科研业务专项基金资助(SWJTU11ZT33);教育部创新团队发展计划资助(IRT0955)

摘　　要：为研究水中悬浮隧道在均匀流作用下的荷载分布规律,采用大涡模拟的数值方法计算5种不同断面形式悬浮隧道的绕流场,比较不同来流速度、宽高比、来流入射角对悬浮隧道升阻力系数和周围压力分布的影响。结果表明:随着来流速度增加,结构表面压强呈平方增长,钝角断面(六边形)升力系数略有增加,阻力系数略有减小,无钝角断面(椭圆形)升阻力系数均减小,变化幅值较小;随断面宽高比增加,矩形升阻力系数先减小后增加,椭圆升阻力系数均减小;随均匀流倾角增大,椭圆断面升力系数增加,阻力系数减小,周向压力分布不再对称于结构水平轴。In order to study the law of load distribution of submerged floating tunnel tubes under uniform flow, large eddy simulation was adopted to calculate the flow field around submerged floating tunnels of five different types of sections. The influence of different uniform flow velocities, aspect ratios and inclinations of incident flow on lift and drag coefficients and pressure distribution around the submerged floating tunnels were com- pared. The results show as follows： Along with raizing of the inflow velocity, the pressures on the structure surface grow by squares, the hexagonal section exhibits slightly increased life coefficients and slightly decreased drag coefficients and the life and drag coefficients of the elliptical section are both reduced with small ampli- tudes; as the aspect ratio of the structural cross-section increases, the life and drag coefficients of the rectangu- lar cross-section first decrease and then increase, and the lift and drag coefficients of the elliptical cross-section both reduce; along with increasing of the inclination of the uniform flow, for the elliptical section, the lift coef- ficient increases, the drag coefficient decreases and the circumferential pressure distribution is no longer sym- metrical to the horizontal axis of the structure.

关 键 词：悬浮隧道 大涡模拟 周向压力分布 升阻力系数 

分 类 号：U451.9[建筑科学—桥梁与隧道工程]