类车体尾迹区雷诺应力实验分析

Experimental Analysis of Reynolds Stress in Wake of Ahmed Model

摘要:

对后倾角35°类车体在模型风洞中进行实验,运用3维热线风速仪在选定测点上对空间3个速度分量进行采样.对采得的瞬时值进行统计分析,并制成雷诺应力分量云图.由图谱可知:类车体尾迹区流动以一对拖曳涡为其主要特征,地面效应影响至流动远场,雷诺应力分量的分布特征随离车体的远近而变化.

Abstract:

The Ahmed model with 35°slant angle was tested in the model wind tunnel.The components of velocity were captured by using 3D CTA.By statistically analysis with the transient value of velocity,the contour spectrums of Reynolds stress components were presented.According to the spectrums,the feature of the flow structure is showed with drag vortex pair and ground effect extending to far field.The distribution characteristic of the stress components varies with the distance from model body.