机翼型微通道高效紧凑换热器流动换热特性  

Heat Transfer Characteristic of Airfoil Microchannel Efficient and Compact Heat Exchanger

作　　者：张天一 郭张鹏 牛风雷[1] 黄彦平[2] ZHANG Tianyi;GUO Zhangpeng;NIU Fenglei;HUANG Yanping(Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy,North China Electric Power University,Beijing 102206,China;CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu 610041,China)

机构地区：[1]华北电力大学非能动核能安全技术北京市重点实验室,北京102206 [2]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,四川成都610041

出　　处：《原子能科学技术》2020年第10期1779-1786,共8页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(U1867218,11705058,11635005);中央高校基本科研业务费专项资金资助项目(2019MS039)。

摘　　要：超临界二氧化碳(S-CO 2)布雷顿循环系统是第4代反应堆采用的新型高效热能转化系统,系统采用微通道高效紧凑换热器作为高低温回热器,其流动换热特性对整体系统热能转化效率有着显著影响。本文采用数值模拟方法,以S-CO 2为流动工质,建立机翼型翼片结构的换热器模型,研究翼片的不同间距对流动换热性能的影响。研究结果表明,交错排列翼片的综合流动换热性能优于翼片并排布置,翼片交错间距为左右间距一半时,增加左右间距,换热器流动换热性能更好。将机翼型微通道换热器与折线型微通道换热器模拟结果进行对比分析表明,机翼型微通道换热器在压降仅为折线型微通道换热器54.174%的情况下,换热性能提升了25.67%。Supercritical carbon dioxide(S-CO 2)Brayton cycle system is a new type of high-efficiency energy conversion system used in the fourth generation reactor.The microchannel efficient and compact heat exchanger is used in the system as high or low temperature recuperators.Besides,heat transfer performance and flow characteristics of heat exchanger have significant impacts on the overall energy conversion efficiency of the system.In this paper,the heat exchanger model of airfoil structure was established and the CFD method was used to study the influence of different spacing of fins on the overall heat transfer characteristics with S-CO 2 as the working fluid.The results show that the convective heat transfer performance of interlaced fins is better than that of side-by-side arrangement.When the interlaced spacing is half of the parallel spacing,the comprehensive performance of heat exchanger is better with the increase of the parallel spacing.The results of airfoil microchannel heat exchanger were compared with those of the Z-shaped microchannel heat exchanger,which shows that the pressure drop of airfoil microchannel heat exchanger is only 54.174%of the Z-shaped microchannel heat exchanger when the heat transfer capacity increases by 25.67%.

关 键 词：超临界二氧化碳 微通道高效紧凑换热器 热效率 机翼型微通道换热器 

分 类 号：TK172[动力工程及工程热物理—热能工程]