叉排微通道换热器的换热性能  

Heat transfer performance of cross-row microchannel heat exchangers

作　　者：魏骏豪 孔令伟 方刚毅 邢菲 WEI Junhao;KONG Lingwei;FANG Gangyi;XING Fei(School of Aerospace Engineering,Xiamen University,Xiamen 361102,China)

机构地区：[1]厦门大学航空航天学院,福建厦门361102

出　　处：《厦门大学学报（自然科学版）》2024年第3期541-549,共9页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(12072303)。

摘　　要：[目的]探究叉排微通道换热器在船用燃气轮机间冷过程中的实验换热性能及其影响因素.[方法]针对增材制造加工的叉排微通道换热器,在低流动工况条件下进行对流换热实验,从结构和流动因素研究叉排微通道换热器的换热性能.[结果]通道宽度减小0.50 mm使叉排换热器换热性能增强106.9%~61.9%;通道数增加1.6倍导致同流量下换热性能平均降低21.9%~50.8%,而同流速下换热性能平均降低11.6%;进口流量增加6.3倍,换热器换热性能提升44.0%;但换热性能受热侧空气进口温度的影响较小,相邻工况条件计算值变化最大仅为5.4%.[结论]工艺条件允许下减小通道尺寸可提升叉排微通道换热器性能,而增加通道数量则会带来负面影响;冷侧水进口流量增大能提升叉排微通道换热器换热量,从而增强换热性能;热侧空气进口温度的影响则较为复杂.[Objective]In marine gas turbines that include intercooling cycles,the performance of the intercooler directly determines the performance of the gas turbine.Microchannel heat exchangers,characterized by their small volume,compact structure,strong heat transfer ability,high stability,have the potential to serve as the core component in intercooler heat transfer.In this study,the experimental heat transfer capabilities of a cross-row microchannel heat exchanger under low-flow conditions were investigated,and the influences of channel structure and flow parameters on the heat exchange performance of the exchanger were analyzed.[Methods]Three types of cross-row microchannel heat exchangers ME01,ME02,and ME03 were obtained through additive manufacturing and processing.ME01 and ME02 have the same channel size of 1.00 mm×1.00 mm,but ME02 has 2.6 times more channels than ME01.The channel size of ME03 is half that of ME01,at 0.50 mm×0.50 mm,and it has 4 times more channels than ME01,thus maintaining the same channel cross-sectional area.The effectiveness-number of heat transfer units(ε-U NTU)method was employed to assess the heat transfer performance of the cross-row microchannel heat exchanger.Using air and water as heat exchange working fluids,the effects of cold water inlet flow rate(0.15,0.30,0.50,0.70,0.90,1.10 m 3/h)and hot air inlet temperature(70,80,90,100,110℃)on the heat transfer performance of cross-row heat exchangers were investigated.[Results]Compared with ME01,at the same water flow rate,the U NTU of ME02 decreased by 21.9%50.8%,while that of ME03 increased by 106.9%61.9%.Considering the significant impact of flow rate,under the same flow rate conditions,ME02 has an average decrease of 11.6%in U NTU compared to ME01.The logarithmic average temperature difference(Δt m)across the three types of cross-row microchannel heat exchangers shows a decreasing trend with water flow rate,with significant changes in ME01 and minimal changes in ME02 and ME03.As the cold side water flow rate increases,U NTU continuo

关 键 词：换热单元 叉排微通道换热器 微通道对流换热实验 增材制造 

分 类 号：P735[天文地球—海洋生物学]