蛇形多孔扁管内燃油流动换热特性数值研究  

Numerical Study of Fuel Flow and Heat Transfer Characteristics for a Serpentine Multiport Flat Tube

作　　者：李玉 王相钦 刘东洋 闵敬春[1] LI Yu;WANG Xiangqin;LIU Dongyang;MIN Jingchun(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]热科学与动力工程教育部重点实验室,清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2025年第1期251-260,共10页Journal of Engineering Thermophysics

基　　金：国家科技重大专项(No.2017-III-0005-0030)。

摘　　要：应用于航空发动机的空油换热器需要在高温大温差的条件下工作,燃油流过换热器时温度会发生显著变化,本文数值研究了蛇形多孔扁管内燃油的流动换热特性,探讨了燃油变物性、管壁温及燃油入口流速的影响,其中蛇形多孔扁管包含6个管程,每根扁管有3个圆孔,扁管间由带挡板的歧管连接。研究结果表明:在每根扁管的三个通道内,燃油流量、压降和对流换热系数分布具有相似性,沿远离管道入口的方向依次递增;与常物性相比,变物性条件下管内对流换热系数和燃油温度更高,压降更小;入口流速增加,流量分布的不均匀性变强,而变物性和管壁温对流量分布的影响相对较小。The air-fuel heat exchanger used in an aero-engine has to work under the operating condition of high temperature and large temperature difference,and when the fuel flows through the heat exchanger its temperature will change significantly.In this paper,the fuel flow and heat transfer in a serpentine multiport flat tube are studied numerically,and the effects of fuel property variability,tube wall temperature and fuel entering velocity are investigated.The serpentine multiport flat tube contains 6 tube paths,and each flat tube holds 3 round holes,with the flat tubes being connected by a manifold with baffles.The results show that the distributions of the fuel flowrate,pressure drop and convective heat transfer coefficient in the three channels of each flat tube are similar,and they all increase along the direction away from the tube entrance.As compared to the constant fuel property case,the variable fuel property case yields a larger heat transfer coefficient,a higher fuel temperature,and a lower pressure drop.With increasing fuel inlet velocity,the non-uniformity of the fuel flowrate distribution becomes more obvious,whereas the influences of fuel variable properties and wall temperature on such a distribution are relatively weak.

关 键 词：空油换热器 蛇形多孔扁管 流动换热 变物性 数值模拟 

分 类 号：TK172[动力工程及工程热物理—热能工程]