热力发电2025，Vol.54Issue(12)：46-55,10.DOI:10.19666/j.rlfd.202502047
渐缩-渐扩流道印刷电路板式换热器结构参数对传热特性的影响数值研究
Numerical study on effect of structural parameters on heat transfer performance of printed circuit heat exchanger with converging-diverging flow channels
摘要
Abstract
Supercritical carbon dioxide(S-CO2)printed circuit heat exchangers(PCHEs)are widely used in Brayton cycle power generation system,but PCHE faces problems such as uneven heat transfer and poor comprehensive performance under different working conditions.To improve the overall performance of PCHE in the Brayton cycle,the comprehensive performance(PEC)of S-CO2 on both the cold and hot sides of PCHE under different parameters was numerically investigated,by using S-CO2 as the working fluid,and varying the convergent-divergent pitch period(T),cross-sectional area ratio(β),and the ratio of convergent length to divergent length(γ).The results show that when β and γ are fixed,the pitch period on the cold side is inversely proportional to the overall performance,while the optimal pitch period on the hot side ranges from 15 mm to 25 mm.The PEC values of PCHE with convergent-divergent pitch periods are consistently greater than 1,indicating superior performance compared to the conventional straight-channel designs.Under a cold-side operating pressure of 22 MPa,the PCHE shows a relatively high comprehensive performance compared to the hot-side operating pressure of 8.5 MPa.When the cross-sectional area ratio β exceeds 1,all PEC values are greater than 1,and the intensified convective heat transfer between the fluid and the wall enhances the overall performance.With other conditions held constant,the system achieves better comprehensive performance when the ratio of convergent to divergent length γ is 3/7.The results provide a reference basis for optimizing the comprehensive performance of PCHE with gradually varying cross-section flow channels.关键词
印刷电路板式换热器/渐缩渐扩流道/超临界二氧化碳/布雷顿循环/数值模拟Key words
printed circuit board heat exchangers/convergent-divergent flow channel/supercritical carbon dioxide/Brayton cycle/numerical simulation引用本文复制引用
XIN Jiajun,ZHANG Renping..渐缩-渐扩流道印刷电路板式换热器结构参数对传热特性的影响数值研究[J].热力发电,2025,54(12):46-55,10.基金项目
国家自然科学基金项目(52466004) （52466004）
景德镇市科技计划项目(2023GY001-10,20202GYZD013-21) （2023GY001-10,20202GYZD013-21）
景德镇陶瓷大学研究生创新专项资金项目(JYC202436)National Natural Science Foundation of China(52466004) （JYC202436）
Jingdezhen Science and Technology Planning Project(2023GY001-10,20202GYZD013-21) （2023GY001-10,20202GYZD013-21）
Graduate Innovation Special Fund Project of Jingdezhen Ceramic University(JYC202436) （JYC202436）
