横向位置对桥上挂车气动特性的影响

在行驶过程中的汽车稳定性、安全性和舒适性会受到侧风的严重影响,因此,侧风稳定性成为汽车空气动力特性的一个重要组成部分。文章以挂车车身为研究对象,采用CFD数值模拟对侧风作用下的汽车气动特性进行了研究,考虑风速、车辆位置以及车辆所受的合成风偏角对汽车气动特性的影响,计算挂车发生侧倾、侧滑的临界风速。结果表明,挂车位于横向不同位置时,在侧风的作用下其气动特性会发生改变,进行车辆的安全性分析时车辆气动力系数应考虑车辆的位置以及车辆所受合成风偏角的影响。

Influence of Lateral Position on the Aerodynamic Characteristics of the Trailer on Bridge Deck

The vehicle driving stability, safety and comfortability are often affected by cross wind while running, thus, the stability under the action of cross wind becomes an important component of aerodynamic characteristics of automobile. Taking the trailer as the research subject this paper analyzes the aerodynamic feature of the vehicle under cross wind using CFD numerical simulation methord. According to the effects of wind speed, vehicle position and composite wind yaw angle on aerodynamic feature of the vehicle, the critical wind speed is calculated when the overturning or the sideslip happens. The results show that the aerodynamic characteristics of the trailer on differenct lateral position will change under the action of cross wind, so the position of vehicle and the composite wind yaw angle should be considered during the vehicle safety analysis.