摘要
深隧系统作为一种有效的城市内涝防治措施,在多竖井入流时存在气团滞留,可能引发压力振荡等问题,从而威胁系统的运行安全.依托苏州河段深隧工程,建立双竖井单隧洞深隧系统模型,采用计算流体力学方法进行数值计算,并通过模型充水试验进行验证,分析多工况入流冲击所导致的气团滞留对压力波动的影响,并总结其规律.结果表明:在设计入流工况下,3.5%的气团滞留可导致最大压力达到35.36 m,相当于控制水位竖井静压的1.77倍;当竖井总入流量恒定时,流量分配对压力的影响较小,而对称入流时极值压力最大,比单侧入流分别偏高3%和6%;在对称入流情况下,随着总入流量的增加,气团的最大压力会先增加后趋于稳定,在总入流量为116 m^(3)/s时,相较于29 m^(3)/s时增大约30%.
As an effective waterlogging control measure,deep storage tunnel systems have air pocket retention during the inflows of multiple shafts,causing issues like pressure surges and threatening the safety of system operation.According to the deep storage tunnel project of Suzhou section,a dual-shaft and single-tunnel system model is constructed.Numerical simulations are carried out with computational fluid dynamics methods and verified by water filling experiments,while the pressure surges of entrapped air pocket under different inflow conditions are analyzed and the variation law is summarized.The results show that under the design inflow condition,the maximum pressure of 3.5%entrapped air pocket can reach 35.36 m,which is 1.77 times of the static pressure of the shaft at the control water level.When the total inflow of shafts is constant,the flow distribution has little effect on the pressure.With symmetrical inflow,the extreme pressure is the largest,which is 3%and 6%larger than the unilateral inflow respectively.In case of symmetrical inflow,with the increase of total inflow,the maximum pressure of air pocket first increases and then stabilizes,and compared with that of 29 m^(3)/s total inflow,it increases by about 30%,corresponding to the total inflow of 116 m^(3)/s.
作者
汪怡然
俞晓东
刘甲春
张健
徐辉
WANG Yiran;YU Xiaodong;LIU Jiachun;ZHANG Jian;XU Hui(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China;Sustainable drainage Laboratory,Ningbo University,Ningbo 315211,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2024年第3期685-690,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金(52179062,51879087)。
关键词
瞬变流
数值计算
深隧系统
滞留气团
transient
numerical simulation
deep storage tunnel system
entrapped air pocket
