汽车声学模型风洞消声拐角数值计算与试验

Numerical Computation and Experiment on Corner Silencer in Automotive Aeroacoustic Model Wind Tunnel

摘要:

运用流体力学数值计算(CFD)以及实验手段对汽车气动声学模型风洞消声拐角导流片形状、片数、头尾结构对气动和消声性能的影响进行研究.研究结果表明,综合考虑压力损失、流场流动的均匀度和气动噪声对消声量的影响,可以寻找最佳导流片数;半椭圆形头部和尖形尾部导流片有较低的压力损失和气动噪声,避免采用半圆形尾部形状；对模型风洞而言,消声拐角主要应以消除中高频噪声为主.

Abstract:

A study was made of the effect of the shape, the number, head and end shape of the turning vanes on the aerodynamic and noise elimination performances of the corner silencer in automotive aeroacoustic model wind tunnel by means of the computational flow dynamics (CFD) and the acoustic experiment. The results show that the optimization number of the turning vanes can be found by considering synthetically the pressure loss, the flow uniformity and the aerodynamic noise influence on noise elimination. Half ellipse head and tine end of the turning vane cause the lower pressure loss and aerodynamic noise than the hemicycle end. The corner silencer for the aeroacoustic model wind tunnel is better to eliminate middle and high frequency noise.