基于CFD的弯管流动与换热影响因素研究  

Research on influencing factors of flow and heat transfer in elbow tube based on CFD

作　　者：吴森林 王秋良 但植华 刘云[1] 廖锐全[1] 甘杜芬[3] WU Senlin;WANG Qiuliang;DAN Zhihua;LIU Yun;LIAO Ruiquan;GAN Dufen(Petroleum Engineering College,Yangtze University,Wuhan 430100,China;Shenzhen Water Planning&Design Institute Co.,Ltd.,Shenzhen 518000,China;School of Computer Engineering,Guilin University of Electronic Technology,Guilin 541000,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]深圳市水务规划设计院股份有限公司,广东深圳518000 [3]桂林电子科技大学计算机工程学院,广西桂林541000

出　　处：《中国测试》2023年第9期7-15,共9页China Measurement & Test

基　　金：国家自然科学基金项目(61572084);中国石油天然气集团公司气举实验基地多相流研究室开放基金资助项目(KF2021002)。

摘　　要：弯管供热广泛存在于实际生活与工程应用中,基于不同影响因素分析弯管流动与换热规律,构建弯管流动与换热的准则关联式。基于计算流体动力学CFD原理,在验证模拟可靠性的前提下,对不同雷诺数Re、相对弯曲半径r、折角θ下的三维DN192弯管进行数值计算,揭示其内部流场的分布情况。结果表明:压降Δp、努塞尔数Nu随着雷诺数、折角的增大而增大,随着相对弯曲半径的增大而减小;阻力系数f随着雷诺数、相对弯曲半径的增大而减小,随着折角的增大而增大;流动与换热准则关联式的拟合值与模拟值吻合度很高;弯管的综合换热性能η随雷诺数的增大呈先增大后减小的规律,当Re为2000时,弯管综合换热性能最好,在Re=2000,r=0.5,θ=π/6时,η最大为1.79。在弯管供热设计中,尽量采用相对弯曲半径较小,来流雷诺数控制在2000左右的弯管,以获得最佳的综合换热性能。研究结果可为弯管供热设计与优化提供相关参考。Bend heat supply widely exists in real life and engineering applications.Based on different influencing factors,the flow and heat transfer laws of bends are analyzed,and the criterion correlation formula for flow and heat exchange in bends is constructed.Based on the principle of computational fluid dynamics(CFD),and on the premise of verifying the reliability of the simulation,numerical calculations were carried out on three-dimensional DN192 elbows under different Reynolds numbers Re,relative bending radius r,and bending angleθto reveal the distribution of the internal flow field.The results show that:the pressure dropΔp and the Nusselt number Nu increase with the increase of Reynolds number and the bending angle,and decrease with the increase of the relative bending radius;the drag coefficient f increases with the increase of the Reynolds number and the relative bending radius.The fitted value of the correlation between the flow and heat transfer criteria is in good agreement with the simulated value;The comprehensive heat transfer performanceηof the elbow increases first and then decreases with the increase of Reynolds number,when Re is 2000,the comprehensive heat transfer performance of the elbow is the best,when Re=2000,r=0.5,θ=π/6,the maximumηis 1.79.In the design of elbow heating,try to use the elbow with a relatively small bending radius and the Reynolds number of the incoming flow is controlled at about 2000 to obtain the best comprehensive heat transfer performance.The research results can provide relevant references for the design and optimization of elbow heating.

关 键 词：弯管 影响因素 CFD 流动与传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]