基于理想流的群围堰绕流解析理论

运用复变函数理论研究了理想液体平面势流的多圆柱绕流,导出了多圆柱绕流的解析解,并对其特殊解进行分析,得出当L/a>3时多圆柱间相互干扰消失;为防止围堰发生过大冲刷,应在距围堰0.75 a范围内防护;防止发生的围堰绕流对行船产生影响,避免轮船对围堰的撞击影响施工进度和质量,应在上游距桥址>0.5L处设置防撞栏;避免绕流流线变化过大,桥轴线方向与水流流速方向夹角一般应控制在α≤5.°

Circumfluence Analytic Theory of Cofferdam Based on Ideal Flow

The circumfluence around columns of plane potential flow was studied based on the theory of functions of a complex variable,and the analytic solution was educed and analyzed.When L/a>3,the muttual interference disappears between cofferdams.In order to prevent cofferdam from heavy scouring,the cofferdam shelter should be placed 0.75a away from cofferdam.For preventing sailing ship from colliding the cofferdam under the effects of cofferdam circling flow,the guard fence around the cofferdam should be installed at 0.5L from upper reaches.For reducing the movement of circumfluence,the α≤5° between brige and current axes is advised.