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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。
Through the three-dimensional numerical simulation of the drainage process of the NandiPu hydropower station, the hydraulic characteristics of the water level in the siphon well, the discharge capacity of the overflow weir and the velocity distribution in the drainage open channel are obtained, which are in good agreement with the experimental results of the model test, indicating that the numerical simulation method Drainage in the siphon wells feasible. On the basis of this, aiming at the defect that the discharge side of the overflow weir of the siphon well overflows to one side, the uneven distribution of the flow velocity and the back flow, the folding weir is replaced by the labyrinth weir. The three-dimensional numerical simulation shows that, Overflow can meet the requirements of discharge, after the weir flow velocity distribution is symmetrical and the return flow intensity and range greatly weakened.