超车简化模型气动干涉实验与数值研究

Experimental and Numerical Investigation of Aerodynamic Interference of Simplified Vehicle Model during Overtaking

基于风洞实验和数值模拟方法,研究了简化车辆模型在超车过程中气动特性的变化规律。整个过程视作准静态,两车横向间距固定且为模型宽的35%,测得两车在不同纵向相对位置时被超车的气动力及流场分布。结果表明:主超车从被超车的后部运动至前部时,被超车受到的气动力和横摆力矩会发生显著变化,当主超车刚到达被超车尾部时,后者所受阻力和侧力均取得最大值。

Based on wind tunnel experiments and numerical simulations,the overtaking process of vehicle models was studied.The lateral distance between the two vehicles is fixed as 35%of the model width,the whole process is assumed as quasi-static,the overtaken model is fixed while the overtaking is set at various axial distances from the former.Both the forces and yaw moment vary significantly when the front of the overtaking vehicle moves from the rear of the overtaken towards its front,both the drag and sideforce maximize at zero location.