Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 1933-1942.doi: 10.13229/j.cnki.jdxbgxb20210186

   

Influence investigation of cooling tube structure and airflow direction on thermal⁃hydraulic performance of air⁃cooled charge air cooler

Xing-jun HU1(),Jing-long ZHANG1,Yu-fei LUO1,Li XIN1,Sheng LI2,Jin-rui HU2,Wei LAN1()   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.China FAW Jiefang Automotive Co. ，Ltd. ，Qingdao 266043，China
  • Received:2021-03-11 Online:2021-11-01 Published:2021-11-15
  • Contact: Wei LAN E-mail:hxj@jlu.edu.cn;lanwei@jlu.edu.cn

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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

CLC Number: 

  • U461.8

Fig.1

Air-cooled charge air cooler"

Table1

Structural parameters"

参数数值参数数值
冷却管长度Lt/mm604百叶间距Lp/mm3
冷却管宽度Wt/mm50百叶翅片长度LLF/mm50
冷却管高度Ht/mm8百叶高度Lh/mm10.5
冷却管厚度Tt/mm0.45锯齿翅片下宽度sSF/mm3.85
百叶开窗角度φ/（°）10锯齿翅片长度lSF/mm8.25
百叶翅片间距PLF/mm2.75锯齿翅片高度hSF/mm7.1
百叶翅片厚度tLF/mm0.1锯齿翅片厚度tSF/mm0.12
百叶翅片高度hLF/mm12锯齿翅片倾角θ/（°）85

Fig.2

Test facility"

Fig.3

Computational domain"

Fig.4

Different cooling tube leading edge structure"

Fig.5

Mesh independence validation"

Fig.6

Experimental and simulation validation"

Fig.7

Relationship between R1 and f under different β"

Fig.8

Velocity at mid XY plane under different R1 when β=30°"

Fig.9

Velocity at mid XY plane under different β when R1=0"

Fig.10

Relationship between R1 and Nu under different β"

Fig.11

Temperature at mid XY plane under different R1 when β=30°"

Fig.12

Temperature at mid XY plane under different β when R1=0 mm"

Fig.13

Relationship between R1 and PECunder different β"

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