关键词: 车辆工程, 空气动力学, 轻型客车, 侧窗区域, 气动噪声, 分离涡模拟

Abstract:

The unsteady flow field around a minivan and the aerodynamic noise from its side window region were computed using the commercial computational fluid dynamics software StarCD.  The distribution of flow separation areas and the positions of aerodynamic noise sources were obtained using the steady Reynolds averaged NavierStokes method.  The unsteady characteristics of the flow field were analyzed using the detached eddy simulation method.  And the aerodynamic noise sound pressure levels at the monitoring points of the side window region were computed using computational aeroacoustics method.  The numerical simulation method was verified by the particle image velocimetry experimental results.  The main reasons to generate the aerodynamic noise were explained by the unsteady flow separating phenomena and the features of the vortex structure.  Numerical simulation results will be conducive to reduce the aerodynamic noise at the early stages of the automobile design process.

Key words: vehicle engineering, aerodynamics, minivan, side window region, aerodynamic noise, detached eddy simulation