冷却管结构及风速对空冷中冷器性能的影响

doi:10.13229/j.cnki.jdxbgxb20200598

摘要/Abstract

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R₁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R₁时，f同样随R₁的增加而减小，在以R₁=0.9 mm为基准时，R₁=0 mm的f因子值最大增加12.42%，R₁=3.6 mm的f因子值最大减小5.41%；冷却管前缘半径R₁相同时，努赛尔数Nu随风速的增加而增大，相同风速不同R₁时，Nu同样随R₁的增大而减小，在以R₁=0.9 mm为基准时，R₁=0 mm的Nu最大增加2.22%，而R₁=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R₁相同时，PEC随风速的增加而增大，而相同风速不同R₁时，PEC随R₁的增大而增大，在以R₁=0.9 mm为基准时，R₁=0 mm的PEC值最大降低10.13%，R₁=3.6 mm的PEC最大增加3.40%。综上，在R₁=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R₁及风速有助于空冷中冷器冷侧热工水力性能的改善。

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

Abstract:

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 thermal-hydraulic performance of an air-cooled charge air cooler （ACAC）. Results showed that， under the same fillet radius R₁the Fanning friction factor f raises with the increasing airflow speed， but at the same airflow speed f decreases with the increasing of R₁， when taking R₁=0.9 mm as a baseline， the f of R₁=0 mm increased at a maximum of 12.42%， the f of R₁=3.6 mm deceased at a maximum of 5.41%； For the Nusselt number Nu， under the same fillet radius R₁ it raises with the increasing airflow speed， but at the same airflow speed it decreases with the increasing of R₁， also taking R₁=0.9 mm as a baseline， the Nu of R₁=0 mm increases at a maximum of 2.22 % and the Nu of R₁=3.6 mm decreases at a maximum of 1.49 %； For PEC， under the same fillet radius R₁ it raises with the increasing airflow speed， and at the same airflow speed， it also increases with the increasing of R₁， again taking R₁=0.9 mm as a baseline， the PEC value of R₁=0 mm decreases at a maximum of 10.13 % and increases at a maximum value of 3.4 % when R₁=3.6 mm. In summary， when R₁=3.6 mm， airflow speed equals 7.5 m/s， the ACAC achieves its best thermal-hydraulic performance， therefore， increasing R₁ and airflow speed is helpful to improve the thermal-hydraulic performance of ACAC.

Key words: mechanical engineering, air-cooled charge air cooler, leading edge structure of cooling tube, airflow speed, computational fluid dynamics, thermal-hydraulic performance

中图分类号:

U461.8

胡兴军,张靖龙,辛俐,罗雨霏,王靖宇,余天明. 冷却管结构及风速对空冷中冷器性能的影响[J]. 吉林大学学报(工学版), 2021, 51(5): 1557-1564.

Xing-jun HU,Jing-long ZHANG,Li XIN,Yu-fei LUO,Jing-yu WANG,Tian-ming YU. Investigation on influence of cooling tube structure and airflow speed on cold side performance of air⁃cooled charge air cooler[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(5): 1557-1564.

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参数	数值	参数	数值
冷却管长度L_t/mm	604	翅片厚度t_LF/mm	0.1
冷却管宽度W_t/mm	50	翅片高度h_LF/mm	12
冷却管高度H_t/mm	8	百叶间距L_p/mm	3
开窗角度φ/（°）	20	翅片长度L_LF/mm	50
翅片间距p_LF/mm	2.75	开窗高度l_h/mm	1.1