中文摘要：

以表达汽车A柱与侧窗形状特征的楔形体为基础,安装某轻型客车的后视镜,建立能够表达汽车后视镜区域流动特点的几何模型。采用计算流体力学软件Star-CD和稳态那维尔—斯托克斯方法,获得此几何模型的后视镜区域流场特性和气动噪声源项的基本信息,进而采用子域数值模拟方法,获得非定常流动特性和侧窗区域监控点的气动噪声声压级。在风洞试验中采用表面丝带法进行流场可视化,并采用激光粒子测速技术测量后视镜尾流场,验证了流场数值模拟的正确性。在风洞中测量侧窗区域监测点的气动噪声声压级,评估计算流体力学方法对气动噪声的预测能力。与风洞试验对比表明,子域数值模拟方法在保证计算精度的前提下降低了气动噪声数值模拟的计算量,为在汽车开发早期阶段预测气动噪声提供了可行的途径。

英文摘要：

The geometry model which can represent the flow characteristics of the automobile rear view mirror is built.The model is a wedge body for the installation of a rear view mirror of a minivan.The wedge body represents the shape features of the automobile＇s A-pillar and the side window.The flow field around the model and the basic aerodynamic noise source term information are simulated by using the computational fluid dynamics software Star-CD and the steady Reynolds Averaged Navier-Stokes（RANS） method.The unsteady flow field and sound pressure levels of the monitoring points on the side window are computed by using a subdomain numerical simulation method.The flow field simulation is verified by wind tunnel experiments by using the surface tuft flow visualization method and the Particle Image Velocimetry technique.Sound pressure levels of the monitoring points on the side window are measured in the wind tunnel.The aerodynamic noise prediction using computational fluid dynamics method is evaluated by wind tunnel experimental results.The subdomain method can reduce the computational cost without losing the accuracy according to the comparison results.The subdomain numerical simulation method is considered as a feasible solution for estimating aerodynamic noise at the early stage of automobile development.