中国电机工程学报2024，Vol.44Issue(12)：4850-4858,中插20,10.DOI:10.13334/j.0258-8013.pcsee.222818
超临界CO2板式扩散焊矩形微通道换热器扰流格栅结构优化研究
Optimization of Grid Structure for Supercritical CO2 Plate Diffusion Welded Rectangular Micro-channel Heat Exchanger
摘要
Abstract
In order to improve the comprehensive flow and heat transfer performance of the printed circuit heat exchanger(PCHE)in the supercritical carbon dioxide(S-CO2)Brayton cycle system,a mathematic-physical model of the heat exchange unit with hot and cold channels is established,based on a new-type rectangular section PCHE manufactured by full etching technology in this paper.The influence mechanism and law of the grid spacing in the channels on the flow and heat transfer characteristics of S-CO2 under different operation conditions are numerically investigated.The results show that the flow velocity of S-CO2 in hot channels with different grid spacings decreases gradually along the channel,while that in cold channels increases gradually along the channel.At the same time,the flow frictional resistance coefficient(f)and Nusselt number(Nu)in hot and cold channels are both increased with the increasing grid spacing.Besides,f and Nu in cold channel are always larger than those in hot channel.When the grid spacing is 5.97 mm,the rectangular section channel has relatively optimal comprehensive performance,which can achieve enhanced heat transfer with small resistance loss.The research results can provide theoretical and data support for the performance improvement and structure optimization of rectangular section PCHE manufactured by full etching technology.关键词
超临界二氧化碳(S-CO2)/印刷电路板式换热器/矩形截面/格栅间距/综合传热增强因子Key words
supercritical carbon dioxide(S-CO2)/printed circuit heat exchanger/rectangular section/grid spacing/comprehensive heat transfer enhancement factor分类
能源科技引用本文复制引用
任燕,王沛东,李洪,刘婧楠,武卫东,章立新,杨其国..超临界CO2板式扩散焊矩形微通道换热器扰流格栅结构优化研究[J].中国电机工程学报,2024,44(12):4850-4858,中插20,10.基金项目
国家自然科学基金项目(52176016) （52176016）
上海市科技计划项目(20060502000,20YF1431300). National Natural Science Foundation of China(52176016) （20060502000,20YF1431300）
Shanghai Science and Technology Program of Shanghai Province(20060502000,20YF1431300). （20060502000,20YF1431300）
