摘要
复杂输水系统通常由明流输水隧洞、暗涵、明渠、渡槽、倒虹吸、有压管道等建筑物构成。合理确定明流隧洞的洞顶余幅,是长距离明流输水系统安全运行的关键。鉴于输水工程中水流流速相对较低,水气界面清晰,水流流型通常为光滑分层流或波状分层流,利用一维水气两相流模型可以模拟分析复杂输水系统的水流运动特性和气流运动特性。本文以一维水气两相流控制方程为基础,提出了水气两相流耦合迭代算法,利用追赶法计算复杂输水系统内的水流和气流运动特性。案例分析表明,对于长距离输水隧洞而言,应考虑气流运动对水流运动的影响,设置通气孔,可改善隧洞内的水流运动特性。建议今后开展低流速输水隧洞洞顶余幅阈值研究,为低流速输水隧洞的设计和运行提供科学依据。
Complex water transfer projects usually consist of open flow water tunnels,culverts,open channels,aqueducts,inverted siphons,and pressurized pipelines.Reasonably determining the freeboard of the open flow tunnel is key to the safe operation of the long-distance open water transfer system.Given that the water flow velocity in the water transfer projects is relatively low,the water air interface is clear,and the water flow pattern is usually smooth stratified flow or wavy stratified flow,the one-dimensional water-air two-phase flow models can be used to simulate the water and air flow characteristics.A coupled iterative algorithm for water-air two-phase flow is presented in this paper based on the one-dimensional water-air two-phase flow mathematical models.The case study shows that for the long-distance water transfer tunnels,the influence of the air flow on the water flow should be considered,and air ventilation tunnels could improve the water flow characteristics.It is suggested that the freeboard threshold be studied for the low speed long distance water conveyance tunnels in order to provide scientific basis for the design and operation of low velocity water conveyance tunnels.
作者
陈文学
穆祥鹏
崔巍
谭水位
CHEN Wenxue;MU Xiangpeng;CUI Wei;TAN Shuiwei(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100038,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《中国水利水电科学研究院学报(中英文)》
北大核心
2025年第1期1-9,30,共10页
Journal of China Institute of Water Resources and Hydropower Research
基金
环北部湾广东水资源配置工程长距离大流量输水系统水流态势与“四预”关键技术研究专题(XJLY-2022 HT-61)
新疆水利水电勘测设计研究院有限公司资助项目“复杂地质条件下超长深埋隧洞复杂断面水力学及安全输水”。
关键词
复杂输水系统
水气两相流
数学模型
通气量
洞顶余幅
complex water transfer project
air-water two-phase flow
mathematical model
air demand
tunnel freeboard
