Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1590-1599.doi: 10.13229/j.cnki.jdxbgxb20191114

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Influence of rearview mirror styling on water phase distribution on side windows

Wei LAN(),Jiang LIU,Li XIN,Jing-xi LI,Xing-jun HU,Jing-yu WANG(),Tao SANG   

  1. State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2019-12-06 Online:2020-09-01 Published:2020-09-16
  • Contact: Jing-yu WANG E-mail:lanwei99@126.com;wangjy@jlu.edu.cn

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Abstract:

Based on the rearview mirrors of sedans, the Lattice Boltzmann method is used to study the flow field characteristics of the rearview mirrors. Combining aerodynamics with multiphase flow theory, the Lagrangian method is applied on the basis of the lattice Boltzmann method to study the water phase distribution on side windows caused by the rearview mirror on rainy days, and to investigate the pollution mechanism. Then the pollution effects of the mirror column and the mirror cover on the side window are studied. The mirror column factors include the length and size, and the mirror cover factors include the windward angle, the inside diffuser angle, the leading edge chamfer angle and the rear departure angle. The Results show that these factors have significant different influences on pollution location and pollution degree of the side windows. Increasing the column length, changing the inside diffuser angle of the cover to 0°, reducing the leading edge chamfer angle of the front cover and changing the rear departure angle to 0° will reduce the pollution level. The influence of the size of the mirror column and the windward angle of the mirror cover on the side window is complicated, but a lower pollution degree can also be obtained. The influence of each factor on the side window pollution is not independent.

Key words: aerodynamics, lattice Boltzmann, side window water pollution, rearview mirror, mirror column, mirror cover

CLC Number: 

  • U461.1

Fig.1

D3Q19 model"

Fig.2

Fastback DrivAer model"

Fig.3

Front windshield wiper"

Fig.4

Computation domain and VR zones setting"

Fig.5

Schematic diagram of emitter"

Table 1

Parameter settings"

参数值
雨水属性密度/（kg·m-3）1000
黏性/（Pa·s）0.001
表面张力/（N·m-1）0.0728
重力/（m·s-2）9.81
表面材料属性再夹带模型激活
再夹带长度/mm0.3
飞溅模型激活
破裂模型激活
雨水发射器属性颗粒直径分布Gaussian
降雨量/（mm·hr-1）17

Fig.6

A-pillar section modification plan"

Fig.7

Body surface film thickness"

Fig.8

Water volume ratio of Z=0.69 m cross-section"

Fig.9

Mirror column length"

Fig.10

Body surface film thickness"

Table 2

RC values after changing mirror column length"

项目RCFRCRRC
Base0.1450.5030.360
Modification0.1240.3130.237

Fig.11

Velocity of Z=0.69 m cross-section"

Table 3

RC values of differentmirror column length"

长度RCFRCRRC
00.1450.5030.360
40.1450.4030.300
70.1290.3430.257
100.1240.3130.237

Fig.12

Mirror column size"

Fig.13

Body surface film thickness"

Table 4

RC values after changing mirror column size"

项目RCFRCRRC
Base0.1450.5030.360
Modification0.2240.5310.408

Fig.14

Velocity of Z=0.69 m cross-section"

Fig.15

Water volume ratio of Z=0.69 m cross-section"

Fig.16

Windward angle"

Fig.17

Body surface film thickness"

Table 5

RC values after changing windward angle"

项目RCFRCRRC
Base0.1450.5030.360
Modification0.1370.5040.357

Table 6

RC values of differentwindward angle"

方案区域面积污染面积RC
6°0.1370.5040.357
3°0.1600.4690.345
00.1450.5030.360
-3°0.1490.4750.344
-6°0.1310.3840.282
-9°0.1380.4280.312

Fig.18

Body surface film thickness"

Fig.19

Water volume ratio of Z=0.66 m cross-section"

Fig.20

Velocity of X=1.3 m cross-section"

Fig.21

Diffuser angle"

Fig.22

Body surface film thickness"

Table 7

RC values after changingdiffuser angle"

项目RCFRCRRC
Base0.2240.5310.408
Modification0.0950.4430.304

Fig.23

Velocity of Z=0.69 m cross-section"

Fig.24

Front chamfer angle"

Fig.25

Body surface film thickness"

Table 8

RC values after changing front chamfer angle"

项目RCFRCRRC
Base0.0950.4430.304
Modification0.0520.4190.272

Fig.26

Water volume ratio of Z=0.68 m cross-section"

Fig.27

Rear departure angle"

Fig.28

Body surface film thickness"

Table 9

RC values after changing rear departure angle"

项目RCFRCRRC
Base0.1450.5030.360
Modification0.1210.4500.318

Fig.29

Water volume ratio of Z=0.68 m cross-section"

Fig.30

Optimization model"

Fig.31

Body surface film thickness"

Table 10

RC values of optimization model"

项目RCFRCRRC
Base0.1450.5030.360
Optimization0.0770.3000.211
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