板翅式换热器的强化传热数值模拟  

Numerical Simulation of Heat Transfer Enhancement of Plate Fin Heat Exchanger

作　　者：徐启[1] 李书金 刘家森 李鹏翔 闫斌 XU Qi;LI Shujin;LIU Jiasen;LI Pengxiang;YAN Bin(School of Energy and Power Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学能源与动力工程学院,郑州450045

出　　处：《能源研究与管理》2023年第1期134-139,共6页Energy Research and Management

摘　　要：为开发效率更高的板翅式换热器,对锯齿形板翅式换热器性能的影响因素进行深入研究。采用数值模拟的方法,建立锯齿形板翅式换热器模型后进行仿真计算,采用单一变量法分别对比分析翅片厚度、间距及高度3种结构参数下板翅式换热器的换热性能和流动特性。分析得出:在研究范围内,换热器综合性能随翅片厚度的降低小幅度增加,翅片间距的增大则会造成换热器中整体翅片数量的减少,减小对流体的扰动,降低换热器总体换热量,相比之下翅片间距为18 mm的翅片综合性能最优。降低翅片高度会增大流道内阻力,高度为48 mm时的翅片综合性能要优于其他尺寸。综合考虑间距较小、翅片高度偏低且翅片厚度更薄时翅片的综合性能最佳,然而翅片厚度越薄往往对制造工艺和经济成本的要求越高,可能得不偿失。In order to develop plate-fin heat exchangers with higher efficiency,the factors influencing the performance of serrated plate-fin heat exchangers were studied in depth.The research chooses numerical simulation method to establish the model of zigzag plate-fin heat exchanger and then carries out simulation calculation.The heat exchange performance and flow characteristics of plate-fin heat exchanger with three structural parameters of fin thickness,spacing and height are compared and analyzed by single variable method.It is concluded that the comprehensive performance of heat exchanger increases slightly with the decrease of fin thickness and the increase of fin spacing will result in the decrease of the number of integral fins in heat exchanger,reduce the disturbance to the fluid and reduce the total heat exchange of heat exchanger,compared with the fin spacing of 18 mm,the overall performance of heat exchanger is the best.Reducing the fin height will increase the resistance in the flow passage,and the overall performance of the fin at a height of 48 mm is better than that of other sizes.Considering the smaller spacing,lower fin height and thinner fin thickness,the fin has the best comprehensive performance.However,thinner fin thickness often requires higher manufacturing process and economic costs,and may pay more than can be obtained.

关 键 词：板翅式换热器 数值模拟 结构参数 换热性能 

分 类 号：TK172[动力工程及工程热物理—热能工程]