隔离带对侧风条件下超车过程车辆气动力的影响

摘要

Dynamic mesh and slip interface technology are used to numerically simulate van overtaking process under crosswind condition for studying the influence of central isolation belt on the aerodynamic forces of vans. The results show that without crosswind,the isolation belt has little effect on the aerodynamic forces of vans, but under crosswind condition,the isolation belt has significant effects. Both sparse and dense isolation belts reduce all aerodynamic forces of overtaking van and the side force and lift force of overtaken van, while the aerodynamic drag of overtaken van decreases with sparse isolation belt and increases with dense isolation belt.%利用动网格和滑移界面技术进行侧风条件下厢式货车超车过程数值模拟,以研究道路中央隔离带对车辆气动力影响规律.结果表明:无侧风时,隔离带对车辆气动力影响较小;但在侧风条件下,隔离带对车辆气动力产生了较大影响.密集和稀疏两种隔离带皆使主超车所有气动力和被超车的侧向力和升力减小,而被超车的气动阻力在稀疏隔离带作用下减小,在密集隔离带作用下增大.