水利学报2025，Vol.56Issue(2)：159-169,180,12.DOI:10.13243/j.cnki.slxb.20240514
长距离输水工程竖井式高位水池水力特性研究
Research on hydraulic characteristics of a vertical drop shaft in long-distance water conveyance projects
摘要
Abstract
The Liyuzhou Drop Shaft is located at the starting point of the water conveyance trunk line of the Water Resource Allocation Project in the Pearl River Delta.It plays a dual role in dissipating energy of plunging jet flows,as well as providing the head for water conveyance.When water plunges into the shaft,air entrainment is likely to occur,which increases the risk of air intake in the downstream water conveyance pipeline.To address this issue,physical modeling at a scale of 1:10 and numerical simulation analysis were conducted to study the air entrainment patterns and the hydraulic characteristics of the flow in the Liyuzhou Drop Shaft.Based on the analy-sis of bubble motion,a semi-empirical formula was derived to calculate the maximum penetrating depth of the bubbles.Measures to reduce air entrainment in the shaft were also proposed.The study shows that under the ac-tion of plunging jet flows,the water body in the Liyuzhou Drop Shaft is stratified with an air-entraining zone,a transition zone and a low-disturbance zone.And only in the transition zone does the air entrainment concentration vary with the change in water depth.The extent of air entrainment is mainly related to factors such as the falling flow discharge,the drop height,the water velocity in the shaft and the overflow weir diameter.After taking measures of increasing the diameter of the vertical shaft by 1.63 times and adding a bypass pipe,the extent of air entrainment and the aeration concentration were significantly reduced in the Liyuzhou Drop Shaft.关键词
竖井/跌水/水流掺气/物理模型试验/数值模拟Key words
drop shaft/plunging jet flow/air entrainment/physical modeling/numerical simulation分类
建筑与水利引用本文复制引用
刘达,黄本胜,李明,张建民,张力方,邱静..长距离输水工程竖井式高位水池水力特性研究[J].水利学报,2025,56(2):159-169,180,12.基金项目
广东省科技创新战略专项资金科研项目(gdsky2023-03) （gdsky2023-03）
珠江三角洲水资源配置工程首批科研项目(WW2018230) （WW2018230）
