基于固-流-热耦合的移动式曝气装置扰流增温特性  

Investigation of ice disturbance characteristics of mobile aeration device based on solid-fluid-thermal coupling

作　　者：赵坊朋 崔溦[1] 李志竑 陈阳 ZHAO Fangpeng;CUI Wei;LI Zhihong;CHEN Yang(National Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;Bureau of South to North Water Transfer of Planning,Designing and Management,Ministry of Water Resources,Beijing 100038,China)

机构地区：[1]天津大学水利工程智能建设与运维全国重点实验室,天津300350 [2]水利部南水北调规划设计管理局,北京100038

出　　处：《南水北调与水利科技（中英文）》2024年第6期1196-1204,共9页South-to-North Water Transfers and Water Science & Technology

基　　金：国家重点研发计划项目(2022YFC3202503)。

摘　　要：移动式曝气装置通过推流螺旋和曝气扰动水体掺混,提升水面温度,阻碍渠道水流结冰,可延长寒区渠道冬季输水时间。为对移动式曝气装置在明渠水环境中的运行进行计算流体动力学(computational fluid dynamics,CFD)模拟,基于固-流-热耦合模拟技术,对不同装置曝气参数和运行条件下的明渠水流物理场进行仿真分析,并对装置运行效果进行评价。结果表明:移动式曝气装置对渠道水流表层温度有一定提升作用,增加曝气速度,可以增强水体的温度掺混效果;曝气深度的增加能够扰动更深层的较高温水体,但考虑岸坡影响,推荐1.5 m深度的曝气参数;增大行走纵距可以提高影响水体范围,但会产生“低温断层区”,最优行走纵距为2 m;行进速度对温度提升影响趋势先减弱后增强,行进速度大于2 m/s时,速度越大,装置对渠道水流的扰流增温效果越好。Long-distance water conveyance projects are essential in solving northern China's water resource shortage problem.However,the complex water transport conditions caused by river icing in winter seriously affect the channel's water transport capacity and the project's safe operation.Balancing the safety issues with water delivery efficiency has become a significant challenge for engineering water delivery operations.Increasing the surface water temperature to delay ice formation is possible by utilizing a mobile aeration device and this ensures the safety of winter operations and enhances the water conveyance capacity of the long-distance water conveyance project.However,as an active measure to increase the winter water delivery capacity of channel engineering,its working adaptability and disturbance heating effect still lack targeted research.To reflect the changes in water characteristics under aeration operation,computational fluid dynamics numerical simulation could be used as a reliable means of fluid research.The solid-fluid-thermal coupling technology is used to simulate the rotation of spiral blades and aeration.Simultaneously considering the heat exchange between water and atmosphere,the changes in water temperature caused by changes in the flow field are calculated.During the simulation,overlapping grid technology is introduced to optimize the dynamic grid calculation,ensuring computational efficiency and accuracy.The initial velocity distribution,temperature distribution,device operating speed,and operating path of the fluid through user-defined functions are set.Two different calculation schemes are designed to simulate and analyze the water characteristics under different aeration speeds,aeration depths,longitudinal distances,and walking speeds.The average temperature change curve and the average water surface temperature distribution map are drawn.The changes in water characteristics under different device parameters are changed and flow operating conditions are pushed,providing a basis for device par

关 键 词：冰期输水 曝气 水温掺混 固-流-热耦合 

分 类 号：TV133[水利工程—水力学及河流动力学]