Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (3): 641-649.doi: 10.13229/j.cnki.jdxbgxb.20220563

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Drag reduction of engine exhaust system based on spray cooling

Cheng-chun ZHANG1,2(),Zhen-tao XIN1,2,Hai YU3(),Yu-feng WU4,Xiao-wei SUN1,2,Tian-yu DU1,2   

  1. 1.Key Laboratory of Bionic Engineering，Ministry of Education，Jilin University，Changchun 130022，China
    2.Weihai Institute for Bionics，Jilin University，Weihai 264402，China
    3.WeiHai Science and Technology Innovation and Development Center，Weihai 264200，China
    4.China North Vehicle Research Institute，Bejing 100086，China
  • Received:2022-05-12 Online:2024-03-01 Published:2024-04-18
  • Contact: Hai YU E-mail:jluzcc@jlu.edu.cn;whkjj@126.com

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Abstract:

The electric heating spray cooling drag reduction test bench was used to systematically study the influence of spray flow rate， spray inclination angle， airflow temperature， and airflow speed on the drag reduction performance of the engine exhaust system. The reason why spray cooling can significantly reduce drag was revealed by DPM-based numerical simulation. The research results show that the drag reduction rate increases with the spray flow rate when the spray flow rate is between 12 mL/s and 24 mL/s. When the spray inclination angle is increased from 45° to 90°， the drag reduction first remains unchanged and then decreases. The drag reduction effect of 45° and 60° spray inclination is the best. When the airflow temperature is between 200 ℃ and 300 ℃， the drag reduction rate increases with the airflow temperature. The drag reduction rate decreases gradually when the airflow velocity increases from 20 m/s to 30 m/s. The reason for the significant reduction in the drag of the exhaust system after spraying is that the airflow velocity reduces， the turbulent intensity reduces， and the local and frictional drag reduces.

Key words: fluid mechanics, exhaust system, spray cooling, drag reduction

CLC Number: 

  • V228.7

Fig.1

Spray cooling drag reduction experiment device"

Fig.2

Component system of experiment device"

Fig.3

Schematic diagram of spray"

Table 1

Value of the influencing factor level"

水平因素
喷雾流量/（mL·s-1）喷雾倾角/（°）气流速度/（m·s-1）

气流温度/

℃

1124520200
2186025250
3247530300
4-90--

Fig.4

Variation of outlet temperature and resistance of exhaust system with time during spraying"

Fig.5

When airflow temperature is 200 ℃， the effect of spray flow rate and spray angle on drag reduction of exhaust system under different speed conditions"

Fig.6

When airflow temperature is 250 ℃， the effect of spray flow rate and spray angle on drag reduction of exhaust system under different speed conditions"

Fig.7

When airflow temperature is 300 ℃， the effect of spray flow rate and spray angle on drag reduction of exhaust system under different speed conditions"

Fig.8

Computational domain model"

Fig.9

Computational domain grid"

Table 2

Calculation results of different scale grids"

网格数量/万计算结果/Pa结果变化量/%
1606403
4816221
744628-

Fig.10

Temperature distribution contour of exhaust system after spraying"

Fig.11

Static pressure distribution contour of exhaust system"

Fig.12

Turbulent kinetic energy distribution contour of exhaust system"

Fig.13

Wall shear contour of exhaust system"

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