铜带材气悬浮退火过程中的气体流动与气固传热特征  

Gas flow and gas-solid heat transfer characteristics of copper sheet during hot-air suspension annealing

作　　者：尹瑾 康灿[1] 吴里程 赵晓宇 YIN Jin;KANG Can;WU Licheng;ZHAO Xiaoyu(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China;China Ship Scientific Research Center,Wuxi 214028,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]中国船舶科学研究中心,江苏无锡214028

出　　处：《中南大学学报（自然科学版）》2023年第4期1252-1262,共11页Journal of Central South University:Science and Technology

基　　金：江苏高校优势学科建设工程项目(苏政办发[2018]87号)。

摘　　要：对气垫炉加热段内0.6 mm厚紫铜板材处理过程中的气体流动和气固传热进行研究,改变板材移动速度和悬浮高度,对气流速度、温度、湍动能的分布及努塞尔数(Nu)进行对比与综合分析,系统地评价板材的处理效果与气垫炉的运行稳定性。研究结果表明:随着板材移动速度增大,板材表面的温度和Nu分布趋于均匀,驻点位置向板材运动方向偏移;Nu的平均值增大,传热效率提高。驻点上游流动分离区内的速度和湍动能均比下游侧的低。板材悬浮高度增大,驻点附近的湍动能下降,而流动分离区的旋涡被拉伸,热传递在流向和展向均被增强;同时,温度和Nu分布更均匀,Nu的平均值增大。The characteristics of flow and heat transfer of a copper sheet,0.6 mm in thickness,processed in the heating section of the air-cushion furnace,were investigated.Effects of the transverse speed and the suspending height of the copper sheer were studied.Distributions of velocity,temperature,turbulent kinetic energy of the air and Nusselt number were compared and analyzed comprehensively.A systematic evaluation of the processing effect of the copper sheet and the operating stability of the air-cushion furnace was performed.The results show that distributions of the temperature and Nusselt number over the copper sheet tend to be uniformized with the increase of transverse speed,and the stagnation point shifts in the direction of the movement of the sheet.Meanwhile,average Nusselt number increases and the heat transfer efficiency is improved.Both velocity andturbulent kinetic energy in the flow-separation zone upstream of the stagnation point are lower than those at the downstream side.As the suspending height increases,the turbulent kinetic energy near the stagnation point decreases,while the vortex in the flow separation region is stretched,and the heat transfer is enhanced in both flow and spanwise directions.Furthermore,distributions of temperature and Nusselt number become more uniform,and average Nusselt number is increased.

关 键 词：气垫炉 数值模拟 动壁面 悬浮高度 温度分布 热传递 

分 类 号：TG155[金属学及工艺—热处理]