Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 426-436.doi: 10.13229/j.cnki.jdxbgxb20180867

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Effect of rearview mirror modeling on aerodynamic noise of front window

Xin CHEN(),Ning WANG,Chuan-liang SHEN(),Xiao FENG,Chang-hai YANG   

  1. State Key Laboratory of Automobile Simulation and Control，Jilin University，Changchun 130022，China
  • Received:2018-08-20 Online:2020-03-01 Published:2020-03-08
  • Contact: Chuan-liang SHEN E-mail:cx@jlu.edu.cn;shencl@jlu.edu.cn

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Abstract:

The aerodynamic noise in the front window area mainly originates from the exterior rearview mirrors. To reduce the aerodynamic noise in this area, numerical simulations of five rearview mirrors were carried out based on the rearview mirror-plate wind tunnel experiment. The realizable k-ε model was used for steady-state analysis, and the separation vortex simulation was based on the realizable k-ε model for transient analysis. The noise data monitored by this numerical simulation method was basically consistent with the wind tunnel experiment results. The plane streamline diagrams, surface acoustic power diagrams and pressure cloud diagrams of the 5 rear-view mirrors are analyzed and compared. The shape factors that affect the aerodynamic noise of the front window area, such as mirror cover, base shape and installation angle are summarize. Results suggest that adjusting and combining these modeling factors properly can effectively reduce the influence of the rearview mirror on the aerodynamic noise of the front side window, which provides a good reference for the optimal design of the rearview mirror.

Key words: vehicle engineering, aerodynamic noise, rear-view mirror, numerical simulation, modeling factors

CLC Number: 

  • U463.85

Fig.1

Rear view mirror and 3D geometric model"

Fig.2

Rearview mirror-flat 3D model"

Fig.3

Computational domain model"

Table 1

Boundary layer structure parameter（DES）"

项目后视镜A后视镜B后视镜C后视镜D后视镜E
首层厚度/mm0.30.30.30.30.3
增长率1.011.011.011.011.01
总层数1010101115
总厚度/mm3.13.13.13.54.8

Table 2

Boundary layer structure parameter（LES）"

项目后视镜A后视镜B后视镜C后视镜D后视镜E
首层厚度/mm0.070.070.070.070.08
增长率1.181.181.181.181.18
总层数1314131415
总厚度/mm33.633.64.9

Table 3

Set boundary conditions"

位置条件说明
计算域入口速度入口V33.33 m/s
计算域出口压力出口标准大气压
后视镜、桌子、计算域底面壁面非滑移壁面
计算域顶面、侧面对称面标准对称面

Fig.4

Residual convergence curve"

Fig.5

Monitoring point distribution of mirror E"

Fig.6

Important monitoring point position's sound pressure level of rearview mirror E"

Fig.7

Position and wake structure diagram of plane X1"

Fig.8

Position and wake structure diagram of plane Y1"

Fig.9

Position and wake structure diagram of plane Y2"

Fig.10

Position and wake structure diagram of plane Z1"

Fig.11

Position and wake structure diagram of plane Z2"

Fig.12

Five kinds of rearview mirror surface pressure cloud"

Fig.13

Five kinds of rearview mirror surface sound power"

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