南迪普电站排水口三维数值模拟及体型优化

通过对南迪普电站排水口排水过程的三维数值模拟,获得了虹吸井中水位、溢流堰泄流能力、排水明渠中流速分布等水力特性,与模型试验结果相比较吻合,表明数值模拟方法用于虹吸井排水可行。在此基础上,针对原设计方案中虹吸井溢流堰泄流偏于一侧、流速分布不均匀及回流等缺陷,采用迷宫堰取代原方案的折型堰,经三维数值模拟计算表明堰上过流量可满足要求泄量,堰后流速分布基本均匀对称且回流强度和范围大大减弱。

Three-dimensional Numerical Simulation of Outfall of Nandipur Power Plant and Shape Optimization

The drainage process of the outfall of Nandipur power plant is calculated with the method of three-dimensional numerical simulation.It obtains the hydraulic characteristics of water level of the siphon well,discharge capacity of the overflow weir and velocity distribution of the open drainage canal.The calculated results show good agreement with the model experimental results,which indicates that the numerical simulation of drainage of siphon wells is feasible.Moreover,for the defects of original design about the inclination to the side of the overflow weir discharge of siphon wells,uneven distribution of velocity in the outfall and existing backflow in the siphon well,the labyrinth weir is adopted to replace the original fold-type weir.The numerical simulation results show that the discharge capacity of weir can meet the requirements;velocity distribution is basically uniform;the strength and scope of the backflow in siphon well has lowered greatly.