摘要
本文用数值模拟法,对三峡坝体深孔泄流的水力特性进行了计算分析。在原坝体深孔设计方案的基础上,对深孔顶部、侧向收缩曲线,以及底部 Ogee 段堰面曲线进行了参数优化计算,提出了适应三峡工程泄洪运行条件的初步修改方案。文中还从减免空蚀的角度,着重探讨坝体深孔体型的设计原则。根据深孔的体型边界综合满足等允许压力水头和等允许空化数的条件,提出了一种按临界落差设计的原则。
The numerical method is used to compute the hydraulic characteri- stics of the deep discharge orifice of the Three-Gorge Dam.On the basis of the original plan,parameters of roof,side shrinkage curves, bottom and Ogee weir of the deep discharge orifice are optimized.A modificatory plan to satisfy the discharge operation condition of the Three-Gorge Project is presented.For cavitation-free,the design crit- eria of deep discharge orifice are discussed.Based upon the condition of both equal pressure head and equal cavitation index,a″critical fall″ design method is put forward.
