溪洛渡水电站泄洪洞双曲挑坎体形设计

溪洛渡水电站4条泄洪洞位于沙谷两岸，为防止泄流水舌冲刷河岸，要求水舌挑射玉河床中心，同时使水舌沿河道方向扩散。为此，泄洪洞出口采用了异形扭曲挑坎。在不可压缩流的NavierStokes方程基础上，以求解流体力学逆命题的方式，按照水电站的地形、地质条件及下泄水流的具体要求，根据事先选定的挑流入水范围，通过计算反求能满足这些要求的挑坎体形。按此设计出的双曲挑坎满足上述要求，而且泄水时挑坎上的压力均呈正压，有利于防止空化的产生。

Design of double curvature flip bucket for spillway in Xiluodu Hydropower Project

The 4 tunnel spillways of Xiluodu Hydropower Project are located at both sides of the river valley.To mitigate the erosion during discharge,the descending points of the nappes must be located at the river center and dispersed along the valley.For this reason,double curvature flip buckets are adopted.The bucket configuration is designed according to the needs of descending points of nappe.The process of calculation is to solve the inverse problem of fluid mechanics.The basci equations for calculation are established and the program for computation is developed.