中冷器冷却扁管管内传热及流阻性能研究  

Study on properties of heat transfer and flow resistance in cooling flat tube of intercooler

作　　者：杨英[1] 邓为[1] 李君[1] 兰柯[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《机电工程》2012年第10期1130-1134,共5页Journal of Mechanical & Electrical Engineering

摘　　要：为解决汽车空-空中冷器冷却扁管最优换热性能的问题,运用FLUENT软件,建立了4种不同断面结构的冷却扁管导热和管内流动换热耦合数学模型,采用CFD方法对该传热问题进行了数值模拟计算。将数值计算的传热努塞尔特数与Gnielinski传热关联式、摩擦因子f与Webb实验关联式、Filonenko经验公式、Blasius关联式进行了对比;良好的结果吻合性验证了数值计算方法的正确性;通过4种冷却扁管换热因子j和流动摩擦因子f的对比分析,提出了冷却扁管综合性能的评价方法(j/f)1/3。研究结果表明,采用无量纲因子(j/f)1/3方法评价口琴式冷却扁管具有最优换热性能,斜撑式冷却扁管次之,从而可为汽车空-空中冷器结构设计或匹配选型提供重要的理论依据。In order to solve the problems of optimal heat transfer performance in cooling flat tube of the air-air car intercooler, the FLUENT software was used, then the corresponding mathematical models on the coupled conduction-convective heat transfer for cooling flat tubes were proposed, the CFD method was employed to solve numerically heat transfer problem. Computed Nusseh was compared with Gnielinski correlations while friction coefficients f was compared with Webb correlation, Filonenko correlation, and Blasius correlation respectively,the results were proved a very good correlation. Then the accuracy of the numerical simulation method was verified. Also the heat transfer factor and friction factor of four cooling flat tubes were analyzed, which evaluation methodology of comprehensive properties was proposed. The study results indicate that the multi-channel rectangle flat tube has the best heat transfer performance while the multi-channel triangle flat tube takes the second place. Moreover, the results provide an important theoretical basis for the structural design or matching of the air-air intercooler.

关 键 词：汽车中冷器 冷却扁管 计算流体力学 换热因子 摩擦因子 流阻性能 

分 类 号：U464.138.2[机械工程—车辆工程] TH122[交通运输工程—载运工具运用工程]