紧凑翅片管式空气-燃油换热器试验  

Experiment of compact finned-tube air-fuel heat exchanger

作　　者：刘启航 闻洁[2,3,4] 吕璐璐 刘银龙 庄来鹤 董苯思 LIU Qihang;WEN Jie;LU Lulu;LIU Yinlong;ZHUANG Laihe;DONG Bensi(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Beihang University,Beijing 100191,China;Research Institute of Aero-Engine,Beihang University,Beijing 100191,China;Hangzhou Innovation Institute(Yuhang),Beihang University,Hangzhou 310023,China;Commercial Aircraft Engine Company Limited,Aero Engine Corporation of China,Shanghai 200241,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]北京航空航天大学,航空发动机气动热力国家级重点实验室,北京100191 [3]北京航空航天大学航空发动机研究院,北京100191 [4]北京航空航天大学杭州创新研究院(余杭),杭州310023 [5]中国航发商用航空发动机有限责任公司,上海200241

出　　处：《航空动力学报》2023年第12期2848-2860,共13页Journal of Aerospace Power

基　　金：国家重大科技专项(J2019-Ⅲ-0021-0065)。

摘　　要：为实现航空发动机内部热环境与热沉的有效交互,探究换热元件的流动换热特性。以航空发动机燃油系统回油冷却换热器为例,开展了小管径矩形翅片管式空气-燃油换热器流动换热性能试验研究。试验采用高温燃油与常温空气两股工质在换热器中进行能量交换,探究换热器在不同工况下的流动与换热性能,获取矩形翅片管式换热单元管外流动换热经验关联式。结果表明:矩形翅片管式换热单元的表面传热系数约为相同结构参数光滑管束换热单元的44%,且试验结构换热单元阻力系数高于光滑管束单元,在进行翅片管束换热器设计时应综合考虑翅片对流动换热性能的影响。试验获取的翅片管式换热单元管外努塞尔数经验关联式与阻力系数经验关联式拟合偏差均不超过5%,较为准确地反应了换热单元外侧的流动换热特性。In order to realize effective interaction between the internal thermal environment and heat sink of aeroengine,the flow and heat transfer characteristics of heat exchanger were studied.Taking the heat exchanger for fuel cooling as an example,the flow and heat transfer performance of small-diameter rectangular finned-tube air-fuel heat exchanger was studied.High temperature fuel and room-temperature air were used as media in the heat exchanger to explore the flow and heat transfer performance under different working conditions.And the empirical correlations for the outside of the tube were obtained.The results showed that the convective heat transfer coefficient of the rectangular finned tube bundles was about 44%of the bare tube bundle with the same structural parameters,while its flow resistance was still higher than the bare tube bundle.Therefore,the influence of fins on flow and heat transfer performance should be comprehensively considered in the design of finned tube heat exchanger.The fitting deviations of the empirical correlations of the Nusselt number and resistance coefficient outside the finned tube heat exchange unit were both lower than 5%,accurately reflecting the flow and heat transfer characteristics outside the finned tube bundles.

关 键 词：航空发动机热管理 换热器 矩形翅片管 顺排 翅片效率 流动换热特性 经验关联式 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]