双管程管壳式换热器的流动与传热机理分析  

Analysis of Flow and Heat Transfer Mechanism of Double-Tube-Pass Shell and Tube Heat Exchanger

作　　者：徐义程 汪世益[1] Xu Yicheng;Wang Shiyi(School of Mechanical Engineering,Anhui University of Technology,Ma′anshan,Anhui 243002,China)

机构地区：[1]安徽工业大学机械工程学院,安徽马鞍山243002

出　　处：《黑龙江工业学院学报（综合版）》2024年第6期146-156,共11页Journal of Heilongjiang University of Technology(Comprehensive Edition)

基　　金：安徽省重大科技攻关项目(项目编号:201903a05020029)。

摘　　要：为探究双管程换热器内部流体的流动与传热机理,建立单管程、双管程换热器的数值计算模型,分析单管程、双管程换热器性能的异同,并探究了不同折流板配置下的双管程换热器内部流体的湍流流动和传热特性。研究结果发现,双管程换热器的管程压降远大于单管程换热器,其管程流体在由第一管程进入第二管程时,会有较大的逆压梯度,在管程封盖中部分流体从主流流体中分离,形成涡流和流动死区,三种不同折流板配置的双管程换热器中,螺旋流换热器的壳程流体混合地较为均匀,并取得了优良的壳程综合性能。研究内容可为双管程换热器的性能优化提供指导,也为热力系统中换热器的选型和结构优化设计提供了理论参考。To investigate the flow and heat transfer mechanism of fluid inside a double tube pass heat exchanger,this paper establishes numerical calculation models for single tube and double tube heat exchangers,analyzes the similarities and differences in the performance of single tube and double tube heat exchangers,and explores the turbulent flow and heat transfer characteristics of fluid inside the double tube heat exchanger under different baffle configurations.The research results show that the pipe-pass pressure on the tube side of a double tube heat exchanger is much greater than that of a single tube heat exchanger.When the fluid on the tube side enters the second tube side from the first tube side,there is a large reverse pressure gradient.In the tube side cover,some fluid separates from the mainstream fluid,forming vortices and flow dead zones.Among the three different baffle configurations of double tube heat exchangers,the shell side fluid of the spiral flow heat exchanger is mixed more uniformly and achieves excellent comprehensive performance on the shell side.The research content can provide guidance for the performance optimization of dual tube heat exchangers,and also provide theoretical reference for the selection and structural optimization design of heat exchangers in thermal systems.

关 键 词：双管程管壳式换热器 强化传热 效能评价系数 计算流体力学 

分 类 号：TK172[动力工程及工程热物理—热能工程] TK124