弯道会车的瞬态气动特性

应用计算流体力学方法,采用重叠网格的策略,对两个简化SAE模型的弯道会车进行了数值模拟研究,获得了两车气动六分力的变化规律.在极短的会车过程中,侧向力、侧倾力矩和横摆力矩都发生了方向的变化,迅速达到各自的正负极值,处在内侧弯道车辆1的侧向力、侧倾力矩和横摆力矩的值略大于外侧弯道车辆2.升力和纵倾力矩也发生了数值和方向的改变,这些都会对车辆的行驶稳定性带来一定的影响,为进一步研究弯道会车的瞬态气动特性提供了理论参考.

Vehicle Transient Aerodynamic Characteristics on Curve Crossing

The method of Computational Fluid Dynamics was applied to numerically simulation. Based on overlapping grid, the transient aerodynamic characteristics of the flow field around two vehicles were studied when simplified model were crossing each other in a curve. The change rules of six aerodynamic components were achieved. In the process of short meeting, side force and rolling moment as well as the yawing moment changed direction, quickly reached their positive and negative value. The side force, rolling moment and yawing moment of CAR 1 inside curve were slightly larger than those of CAR 2 outside curve. The lift force and pitching moment were changed on value and direction. All of these would bring some influence on vehicle driving stability. This study provided theoretical reference for the further study of curve crossing.