越过矩形分流墩的急流  

Supercritical flow over rectangular splitter pier

作　　者：孙建[1] 阎晋垣[1] 

机构地区：[1]西安理工大学

出　　处：《水利水运科学研究》1995年第2期166-175,共10页

摘　　要：用模型试验和回归分析的方法研究了中、低Ｆｒ下，越过矩形分流域、墩后通大气的急流．应用动量方程得到墩上游水跃旋滚流态与急流飞越流态之间的界限Ｆｒ判别式。通过试验得到急流飞越而过流态下，墩上游无因次水深及墩体阻力系数分别与设墩处水流收缩比、墩高比和控制断面Ｆｒ之间的变化关系；墩上游和墩体壁压分布，论证了墩体在墩后充分通气时产生空化的可能性．Supercritical flow over a rectangular splitlitter pier behind which air can be drawn is researched by means of regression analysis and model test at medium and low Froude number.A critical Froude number formula which distinguishes the condition of nonsplashing from that of splashing over is developed by using the momentum equation.Flow splashing over the pier, the relations of demensionless free surface, and that of the drawn coeffcient repectively to the relative pier height, flow contract ratio,and the Froude number are obtained. At last it is proved that the dissipator would never cavitate,provided that air can be drawn behind it.

关 键 词：矩形分流墩 急流 墩体 空化 消能工 收缩式 

分 类 号：TV653.9[水利工程—水利水电工程]