吉音水利枢纽竖井旋流泄洪洞水力特性试验研究

通过1∶30的水工模型对吉音水利枢纽竖井旋流泄洪洞的水流流态、压力分布、流量系数等水力特性进行了研究,分析了在进水口溢流堰末端增设掺气坎对进水口及竖井内流态及通气孔风速的影响。研究结果表明:在溢流堰末端增设掺气跌坎有利于减小溢流堰面的负压、防止空蚀破坏、简化进口体型设计,且有利于泄洪洞的安全运行。

Experimental study on hydraulic characteristics of vortex spillway tunnel in Jiyin Water Control Project

Based on 1∶30 hydraulic model test，the hydraulic characteristics，such as flow pattern，pressure distribution，flow coefficient，etc.，of the vertical vortex spillway tunnel of Jiyin Water Control Project are studied herein，in which the impact from the added aerator at the end of the intake overflow weir on the flow patterns inside of both the intake and the shaft as well as the ventilation velocity of the vent is analyzed.The study result shows that it is favorable to reduce the negative pressure on the surface of the overflow weir，if aerator is added at the end of it； which can prevent the damage from cavitation，simplify the shape design and then benefit the safety operation of the spillway tunnel.