长距离输水洞分水口模型试验及过流能力研究

Model Test on Flow Diversion and Flow Capacity of Water Delivery Tunnel with Long Distance

水力学模型试验是验证过水建筑物设计合理性的重要方法之一。基于流体力学和水工模型理论对山西中部引黄工程输水洞分水口开展了模型试验研究。验证了总干隧洞、西干和东干支洞在闸门不同开度下的过流能力、流量分配;给出了闸门与闸前水面线高度的相互关系。结果表明:东西干闸门开度分别为0.60 m和0.56 m时能保证输水能力,并满足东西干流量分配;闸门启闭速率与闸前水位呈负相关。研究成果对无压输水隧洞分水口过流能力研究具有重要理论意义,并对闸门启闭和系统调度具有实际参考价值。

Hydraulic model test is an important means to verify the rationality of water building design.In this study,physical model test is carried out to research the water diversion tunnel of Yellow River Diversion Project in the Middle of Shanxi Province based on fluid theory and hydraulic model theory.Flow capacity of the main tunnel and flow distribution between west branch tunnel and east branch tunnel with different gate openings are studied;the relationships of gate opening and closing rate against water level in front of gate are obtained.Results demonstrate that the design flow discharge and discharge ratio can be achieved in the presence of east gate opening at 0.60 m and west gate opening at 0.56 m.Moreover,gate opening and closing rate is negatively correlated with upstream water level.The results are of theoretical significance for researching the flow capacity of non-pressurized water delivery tunnel,and provide reference for gate control system.