冷却管结构及风速对空冷中冷器性能的影响  

Investigation on influence of cooling tube structure and airflow speed on cold side performance of air⁃cooled charge air cooler

作　　者：胡兴军[1] 张靖龙 辛俐 罗雨霏 王靖宇[1] 余天明[1] HU Xing-jun;ZHANG Jing-long;XIN Li;LUO Yu-fei;WANG Jing-yu;YU Tian-ming(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2021年第5期1557-1564,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51875238).

摘　　要：本文在实验基础上,使用计算流体动力学方法研究了不同空冷中冷器冷却管前缘结构及风速对其冷侧热工水力性能的影响。研究发现,冷却管前缘半径R_(1)相同时,Fanning摩擦因子f随风速的增加而减小,而相同风速不同R_(1)时,f同样随R_(1)的增加而减小,在以R_(1)=0.9 mm为基准时,R_(1)=0 mm的f因子值最大增加12.42%,R_(1)=3.6 mm的f因子值最大减小5.41%;冷却管前缘半径R_(1)相同时,努赛尔数Nu随风速的增加而增大,相同风速不同R_(1)时,Nu同样随R_(1)的增大而减小,在以R_(1)=0.9 mm为基准时,R_(1)=0 mm的Nu最大增加2.22%,而R_(1)=3.6 mm的Nu最大减小1.49%;对于性能评价准则PEC,冷却管前缘半径R_(1)相同时,PEC随风速的增加而增大,而相同风速不同R_(1)时,PEC随R_(1)的增大而增大,在以R_(1)=0.9 mm为基准时,R_(1)=0 mm的PEC值最大降低10.13%,R_(1)=3.6 mm的PEC最大增加3.40%。综上,在R_(1)=3.6 mm、冷侧风速为7.5 m/s时,空冷中冷器冷侧热工水力性能最佳,因此增大R_(1)及风速有助于空冷中冷器冷侧热工水力性能的改善。Based on the existed experimental results,this paper applies the Computational Fluid Dynamics(CFD)to investigate the leading edge structure of the cooling tube and airflow speed on the thermalhydraulic performance of an air-cooled charge air cooler(ACAC).Results showed that,under the same fillet radius R_(1) the Fanning friction factor f raises with the increasing airflow speed,but at the same airflow speed f decreases with the increasing of R_(1),when taking R_(1)=0.9 mm as a baseline,the f of R_(1)=0 mm increased at a maximum of 12.42%,the f of R_(1)=3.6 mm deceased at a maximum of 5.41%;For the Nusselt number Nu,under the same fillet radius R_(1) it raises with the increasing airflow speed,but at the same airflow speed it decreases with the increasing of R_(1),also taking R_(1)=0.9 mm as a baseline,the Nu of R_(1)=0 mm increases at a maximum of 2.22%and the Nu of R_(1)=3.6 mm decreases at a maximum of 1.49%;For PEC,under the same fillet radius R_(1) it raises with the increasing airflow speed,and at the same airflow speed,it also increases with the increasing of R_(1),again taking R_(1)=0.9 mm as a baseline,the PEC value of R_(1)=0 mm decreases at a maximum of 10.13%and increases at a maximum value of 3.4%when R_(1)=3.6 mm.In summary,when R_(1)=3.6 mm,airflow speed equals 7.5 m/s,the ACAC achieves its best thermal-hydraulic performance,therefore,increasing R_(1) and airflow speed is helpful to improve the thermal-hydraulic performance of ACAC.

关 键 词：机械工程 空冷中冷器 冷却管前缘结构 风速 计算流体动力学 热工水力性能 

分 类 号：U461.8[机械工程—车辆工程]