汽车尾迹涡的形成及其控制

The Mechanism and the Control of the Road Vehicle Wake Vortices Formation

绕汽车的流场在其尾部形成非常复杂的的尾迹。本文通过大量试验研究,对尾迹中旋涡形成的机制归纳为以下几种动态仿真理论模型,即涡量注入模型、剪切层相互作用模型、涡列有限涡核稳定模型、二次分离涡振荡模型及尾流绝对不稳定模型。在此基础上研究了控制上述尾迹旋涡结构和抑制涡激振动的方法。

The flow field around the road vehicle forms very complicated wake at rear end. In the paper, based on the mechanism of the wake vortex formation, five types of theoretical models for dynamic simulation are induced through many experiments. They are the vorticity-filling model, the shear layer interaction model, the model with finite vortex cores and steady vortex row, twice separation vortex vibration model and the absolutely unstable wake model. Based on the above models, the methods to control the structures of the wake vortex and restrain the vortex excited vibration are studied.