汽车工程

汽车工程 ›› 2021, Vol. 43 ›› Issue (12): 1840-1847.doi: 10.19562/j.chinasae.qcgc.2021.12.014

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汽车后视镜-A柱区域气动噪声源特征识别

王毅刚(),赵思安,张昊,杨志刚   

  1. 1.同济大学，上海地面交通工具风洞中心，上海 　201804
    2.上海市地面交通工具空气动力与热环境模拟重点实验室，上海 　201804
  • 收稿日期:2021-08-25 修回日期:2021-10-04 出版日期:2021-12-25 发布日期:2021-12-24
  • 通讯作者: 王毅刚 E-mail:yigang.wang@sawtc.com
  • 基金资助:
    上海市地面交通工具空气动力与热环境重点实验室科研计划项目(18DZ2273300)

Feature Identification of Aerodynamic Noise Source in Vehicle Rearview Mirror-A Pillar Area

Yigang Wang(),Sian Zhao,Hao Zhang,Zhigang Yang   

  1. 1.Tongji University，Shanghai Automotive Wind Tunnel Center，Shanghai 　201804
    2.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Shanghai 　201804
  • Received:2021-08-25 Revised:2021-10-04 Online:2021-12-25 Published:2021-12-24
  • Contact: Yigang Wang E-mail:yigang.wang@sawtc.com

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摘要：

本文旨在对汽车后视镜-A柱区域气动噪声源的特征进行识别。首先，以涡声理论为基础，利用汽车气动噪声源主要为偶极子声源的声学特征，将气动声源等效为无数微球形声源组成。接着，利用声辐射和流场物理量之间的关系，结合气动数值仿真技术，建立了偶极子声源的识别方法，对汽车后视镜-A柱区域的气动噪声源进行识别。最后，基于物理量和声源的关系，揭示了偶极子声源的产生机理。结果表明，后视镜-A柱区域的主要偶极子声源出现在部件外形表面的棱线和转折位置，其物理量随空间的变化剧烈是产生气动声源的主要原因。涡量是声源强度的主要贡献者，但涡量ω和速度夹角θ对声源强度也有影响。

关键词: 车辆, 气动噪声, 后视镜, A柱, 偶极子声源, 涡量

Abstract:

This paper aims to identify the features of aerodynamic noise source in rearview mirror–A pillar area. Firstly， on the basis of the theory of vortex sound， and utilizing the acoustic feature that the vehicle aerodynamic noise source is mainly the dipole sound source， the aerodynamic sound source is equivalent to innumerable micro-spherical sound sources. Then， using the relationship between sound radiation and the physical quantities of flow field， combined with aerodynamic numerical simulation technology， an identification method of dipole sound sources is established， and the aerodynamic noise source in rearview mirror-A-pillar area is identified. Finally， based on the relationship between physical quantities and the sound source， the generation mechanism of the dipole sound source is revealed. The results show that the main dipole sound source in rear-view mirror-A-pillar area appears on the ridgelines and turning positions of the component’s surface， the intense change of physical quantities with space is the main reason of the generation of aerodynamic sound source， the vorticity ω is the main contributor to the intensity of sound source， but the angle θ between vorticity and velocity also has certain effects on the intensity of sound source.

Key words: vehicles, aerodynamic noise, rearview mirror, A-pillar, dipole sound source, vorticity