翼型翅片PCHE的结构参数优化与流动传热的数值模拟  

Optimization of structural parameters and thermal-hydraulic numerical simulation of printed circuit heat exchanger with airfoil fins

作　　者：刘晨 李启明[1] 邹杨[1,2] 徐洪杰 LIU Chen;LI Qiming;ZOU Yang;XU Hongjie(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2021年第11期82-90,共9页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XDA02010200、No.XDA22010501);中国科学院青年创新促进会(No.2012210)资助。

摘　　要：翼形翅片的印刷电路板式换热器(Printed Circuit Heat Exchanger,PCHE)是一种新型高效紧凑的微通道热交换器,具有紧凑、耐高温、耐高压等优点,在太阳能、液化天然气和核能等清洁能源领域受到广泛的关注。针对翼形翅片PCHE在FNaBe为工质流体的高温熔盐换热器方面的应用,利用数值模拟和正交实验设计的方法研究了不同翼形翅片排布方式在能量利用效率方面的表现并进行了参数优化。对优化的排布方式进行了对流换热以及压降特性的研究,并总结了Nu和f因子的经验关系式。[Background]Printed circuit heat exchanger(PCHE)with airfoil fins is a new type of microchannel heat exchanger with high efficiency and compactness,which has the advantages of high-temperature and high pressure resistance.In the field of clean energy such as solar,liquefied natural gas and nuclear energy,PCHE with airfoil fins has received widespread attention.[Purpose]This study aims to optimize the structural parameters of PCHE with airfoil fins through numerical simulation,and summarize the heat transfer characteristics.[Methods]The computational fluid dynamics program Fluent was employed to design and optimize the structure of PCHE in high temperature molten salt heat exchanger with FNaBe as working fluid.The thermal-hydraulic characteristics such as pressure drop and convective heat transfer coefficient of different airfoil fins arrangements were simulated and compared.Thereafter,orthogonal experimental design was used to find out the arrangement of airfoil fins with the highest energy efficiency.A series of operating conditions were simulated to study the heat transfer and pressure drop characteristics of the best arrangement.[Results]The arrangement of airfoil fins has the highest energy efficiency when the horizontal distance is 4 mm,vertical distance is 9 mm,and staggered distance is 4 mm.Two correlations were developed to predict heat transfer and pressure drop performance.[Conclusions]This study provides a useful reference for the design of PCHE with airfoil fins in molten salt reactor.

关 键 词：印刷电路板式换热器 翼型翅片 数值模拟 正交试验设计 高温熔盐 流动与传热特性 

分 类 号：TL33[核科学技术—核技术及应用]