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本文从汽车天窗气动噪声的机理入手,利用与实车几何尺寸为1:5的简化模型进行了空腔绕流的数值计算,分析了其流场结构及气动噪声产生的原因。在低速静音风洞中进行了不同流速下的流场和声场实验研究,研究了天窗不同位置的速度剪切层变化,以及不同流速下的声压级变化,发现了除了特征频率下的风振噪声,还存在较大频率范围的气动噪声,其随着流速的增加有着明显的增大。
This paper starts from the mechanism of aerodynamic noise in automotive sunroof and calculates the flow around the cavity by using a simplified model with 1: 5 actual vehicle geometry, and analyzes the flow field structure and the causes of aerodynamic noise. The flow field and the sound field under different velocities were experimentally studied in the low-speed mute wind tunnel. The changes of the velocity shear layer at different positions of the sunroof and the changes of the sound pressure level at different velocities were studied. It was found that in addition to the wind vibration Noise, there is also a larger range of aerodynamic noise, which increases with the flow rate has increased significantly.