某SUV型汽车后视镜气动噪声数值仿真  

Numerical simulation of wind noise of a kind of SUV vehicle rear-view mirror

作　　者：刘海军[1,2,3] 任秉银[1] 徐旭[3] 赵伟丰[3] 刘二宝[3] 梁赫[3] 彭兴芝[2] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]河北大学建筑工程学院,河北保定071000 [3]长城汽车股份有限公司河北省汽车工程技术研究中心,河北保定071000

出　　处：《哈尔滨工业大学学报》2016年第1期35-39,共5页Journal of Harbin Institute of Technology

基　　金：河北省青年自然科学基金(QN2014185)

摘　　要：为有效降低汽车气动噪声,依据声类比思想将气动噪声计算分成流场和声场计算,采用全域与子域分步计算流场和ACTRAN计算声场相结合的方法对某SUV型汽车后视镜的3种方案的气动噪声进行数值仿真,得到车外流场与车内外的声场及声压级频谱曲线,分析流场云图和声压级频谱曲线的变化规律.结果表明:方案III的后视镜因边缘凸起改善了侧窗外流场湍流脉动压力、漩涡和声源位置分布,减少了后视镜通过侧窗传播到车内的噪声.数值仿真结果与实验测试结果吻合较好,验证了方法的正确性.该方法可优化车内声场的分布,提高司乘人员舒适性.Calculation of the acoustics noise is divided into calculation of flow field and acoustic field based on the acoustic analogy theory. Numerical simulation of aeroacoustics noise caused by a kind of SUV vehicle rear-view mirror is finished by combining calculation of flow field step by step in complete domain ＆ subdomain with calculation of acoustics field by ACTRAN. The simulation results of aeroacoustics noise caused by the rear-view mirror are well consistent with the experimental results. The accuracy and reliability of numerical simulation method is verified. The aeroacoustics noises caused by the optimized rear-view mirrors are simulated with this method. The contours of external flow field, internal ＆ external acoustics field and the curves of sound pressure level spectrum of the vehicle are obtained. The outflow field turbulent fluctuation pressure, the vortex and the distribution location of the sound source are improved in the scheme III of the rear-view mirror by analyzing the variation rule of flow field contour and the spectrum curve of acoustics field. The aeroacoustics noise propagated into cabin through the side window is weakened. The distribution of internal acoustics field in cabin is optimized and the comfortability of driver and passengers is improved.

关 键 词：气动噪声 汽车后视镜 声类比 声场 流场 

分 类 号：U461.1[机械工程—车辆工程]