冷却管结构及进气方向对空冷中冷器性能的影响

doi:10.13229/j.cnki.jdxbgxb20210186

摘要/Abstract

摘要：

首先，通过试验方法获得了基准空冷中冷器在不同速度时的冷侧静压降和传热系数。然后，采用计算流体力学方法对试验值进行了验证，结果表明，对于静压降，试验值与仿真值的绝对误差不超过7%，而传热系数则不超过15%，说明当前仿真的准确性。接着，继续采用计算流体方法研究了冷侧风速为6 m/s时，不同冷却管前缘半径R₁及进气方向β对空冷中冷器冷侧热工水力性能的影响，结果表明，当R₁=3.6 mm且β=90°时，Fanning摩擦因子f取得各工况中的最小值；当R₁=0 mm且β=90°时，努赛尔数Nu取得各工况中的最大值；当 $R 1 = 3.6 ? m m$ 且β=90°时，中冷器热工水力性能综合评价准则PEC取得各工况中的最大值。

关键词: 车辆工程, 空冷中冷器, 冷却管前缘结构, 进气方向, 计算流体力学, 热工水力性能

Abstract:

In this paper, the static pressure drop and heat transfer coefficient of the cold side of the benchmark air-cooled Charge Air Cooler (CAC) at different speeds are obtained through experimental methods. Then the experimental values are verified by computational fluid dynamics methods. Results show that for the static pressure drop, the absolute error between experimental values and simulation values is less than 7%, and for heat transfer coefficient the error is less than 15%, which indicates the accuracy of the current simulation. After the validation, computational fluid dynamics method was applied to investigate the influence of the leading edge radius R₁ of the cooling pipe and the airflow direction β on the cold side thermal and hydraulic performance of the CAC under the airflow speed of 6 m/s. Research results show that, when R₁=3.6 mm and β=90°, the Fanning friction factor f achieves the minimum value in each working condition; when R₁=0 mm and β=90°, Nusselt number Nu reaches the maximum value in all working conditions; and when R₁=3.6 mm and β=90°, the Performance Evaluation Criterion (PEC) for the thermal and hydraulic performance of the CAC obtaines the maximum value in each working condition.

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

中图分类号:

U461.8

胡兴军,张靖龙,罗雨霏,辛俐,李胜,胡金蕊,兰巍. 冷却管结构及进气方向对空冷中冷器性能的影响[J]. 吉林大学学报(工学版), 2021, 51(6): 1933-1942.

Xing-jun HU,Jing-long ZHANG,Yu-fei LUO,Li XIN,Sheng LI,Jin-rui HU,Wei LAN. Influence investigation of cooling tube structure and airflow direction on thermal⁃hydraulic performance of air⁃cooled charge air cooler[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 1933-1942.

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参数	数值	参数	数值
冷却管长度L_t/mm	604	百叶间距L_p/mm	3
冷却管宽度W_t/mm	50	百叶翅片长度L_LF/mm	50
冷却管高度H_t/mm	8	百叶高度L_h/mm	10.5
冷却管厚度T_t/mm	0.45	锯齿翅片下宽度s_SF/mm	3.85
百叶开窗角度φ/（°）	10	锯齿翅片长度l_SF/mm	8.25
百叶翅片间距P_LF/mm	2.75	锯齿翅片高度h_SF/mm	7.1
百叶翅片厚度t_LF/mm	0.1	锯齿翅片厚度t_SF/mm	0.12
百叶翅片高度h_LF/mm	12	锯齿翅片倾角θ/（°）	85