叠压供水方式下支管管径对干管水锤影响

Influence of Branches Diameter on Main Pipe Water Hammer under Superposed Supply

长距离输水工程的水锤防护目前多集中于干管研究,而对预留口分支管的研究涉及较少,尤其在不同类型支管对输水系统水锤影响方面还有待深入研究。为了研究叠压供水方式下不同管径支管对干管水锤影响,以某水利枢纽工程为例,结合水锤仿真模拟试验对不同工况条件下水锤进行分析。结果表明,当支管与干管管径比(简称支干管径比)大于1/6时支管对干管水锤影响较大,干管的水锤防护措施不再适用;而当支干管径比小于1/6时支管对干管水锤影响减弱,已有的措施能基本满足水锤防护要求。研究结果对于类似工程水锤防护及安全稳定运行具有重要的借鉴意义。

At present,the water hammer protection of long-distance water delivery engineering mainly focuses on the main pipe research,while the research on reserved branch pipe is less involved,especially the influence of different types of branch pipe on water hammer of water delivery system needs to be further studied.In order to study the influence of different diameter of branch pipes on water hammer of main pipe under pressure-superposed water supply mode,taking a hydro project as an example,simulation experiment was used to analyze water hammer under different working conditions.The results show that when the diameter ratio of branch pipe to main pipe(hereinafter referred to as"diameter ratio of branch pipe to main pipe")is less than 1/6,the branch pipe has a greater impact on the water hammer of main pipe,and the protection measures of water hammer of main pipe are no longer applicable,so further protection must be carried out.However,when the diameter ratio of branch pipe to main pipe is greater than 1/6,the influence of branch pipes on the water hammer of main pipes is weakened,and the existing measures can basically meet the requirements of water hammer protection.This is of great significance for water hammer protection and safe and stable operation in similar projects.