Hydraulic Analysis Of Bi-directional Water Transfer Conduit In Xianlin Reservior Project

As a backup water resource, Xianlin reservoir project will pay an important role in municipal water supply of Hangzhou. The water transfer pipelines from Xianlin reservoir to Shanghusha reservoir is constitute of pressured conduits and covered channels. This project includes pressured valve, bump station and other control equipments and its rated discharge is 25m3/s. Considering the reservoir capacity, the water transfer pipeline can also used to inverse water supply. This paper studies the hydraulic characteristics in order to optimize the design of water transfer pipelines.Many kind of hydraulic conditions were studied by numerical simulation. For the steady pipe flow, the numerical simulations present the pressure and discharge of pipe sections. The influence of inverse water supply on the pipeline to west district, which is other water transfer project, is analyzed. For unsteady flow, which takes place by closing valve, opening valve, starting bump and shutting bump, the numerical present the fluctuations of discharge and water head. Moreover maximal and minimal hydraulic transient pressure is established by numerical simulation of computer.The digital results show that the water supply pipe is optimized by adjusting the diameter of the pipeline. Considering the inverse water supply, the flow discharge of west district pipeline will reduce 11%. The hydraulic transient pressure was also controlled by adjust the time of closing valves. In order to ensure the safe of pipeline, the time of closing valve is suggested more than 120s. The project can satisfy the need without surge tank, since it can endure the sublime hydraulic conditions. Moreover, starting bump at intervals is suggested to mitigate the hydraulic transient pressure.