The velocity profiles at six different cross sections and the development of the boundary layer over the surface of the overflow dam are given.Based on the experimental data using laser fcchnique the boundary layer th...The velocity profiles at six different cross sections and the development of the boundary layer over the surface of the overflow dam are given.Based on the experimental data using laser fcchnique the boundary layer thickness expression is derived.The velocity distributions within the boundary layer nearby the bottom of the dam are ana- lyzed.The fluctuating pressure on the overflow dam is compared with the fluctuating velocity nearby the bottom of the dam.展开更多
溢流坝下游收缩断面水深 hc 的计算对水工消能设计十分重要. 目前常用的方法有试算法、图解法和迭代法,这些方法计算精度不高,人工计算量大或要求较高的计算数学的理论知识等,不便于在生产实际中推广应用. 为此,把 hc 的计算问题...溢流坝下游收缩断面水深 hc 的计算对水工消能设计十分重要. 目前常用的方法有试算法、图解法和迭代法,这些方法计算精度不高,人工计算量大或要求较高的计算数学的理论知识等,不便于在生产实际中推广应用. 为此,把 hc 的计算问题归结为非线性优化问题,用作者研制的加速遗传算法 (AGA) 来处理. 应用 AGA 方法的实例计算结果说明 AGA 比常用方法简便 计算精度高且具有通用性.展开更多
文摘The velocity profiles at six different cross sections and the development of the boundary layer over the surface of the overflow dam are given.Based on the experimental data using laser fcchnique the boundary layer thickness expression is derived.The velocity distributions within the boundary layer nearby the bottom of the dam are ana- lyzed.The fluctuating pressure on the overflow dam is compared with the fluctuating velocity nearby the bottom of the dam.
文摘溢流坝下游收缩断面水深 hc 的计算对水工消能设计十分重要. 目前常用的方法有试算法、图解法和迭代法,这些方法计算精度不高,人工计算量大或要求较高的计算数学的理论知识等,不便于在生产实际中推广应用. 为此,把 hc 的计算问题归结为非线性优化问题,用作者研制的加速遗传算法 (AGA) 来处理. 应用 AGA 方法的实例计算结果说明 AGA 比常用方法简便 计算精度高且具有通用性.