造型细节和离地间隙对轿车气动性能影响研究_修改稿

汽车造型的不同处理方法、发动机安放位置、离地间隙、发动机舱冷却风的排出模式对轿车气动性能产生影响。应用FLUENT软件，分别对汽车造型的不同处理方法、发动机安放位置、离地间隙、发动机舱冷却风的排出模式进行气动性能仿真。结果表明：汽车造型的处理方法中以加车轮和加发动机舱对气动性能影响最大，发动机存在最佳的安放位置，不同的离地间隙对仿真结果影响很大，选择发动机舱冷却风的排出模式要综合考虑阻力系数和升力系数。

The effect of modeling and ground clearance on aerodynamic characteristics of cars

Different disposal ways of car modeling, placement of engine, ground clearance, the removal mode of the cooling air in engine cabin have effect on aerodynamic characteristics of cars. analysis the aerodynamic characteristics through the simulation of different disposal ways of car modeling, placement of engine, ground clearance, the removal mode of the cooling air in engine cabin with FLUENT software. The results show that: adding the wheels and the engine cabin among the car modeling have the greatest impact on the aerodynamic characteristics, there is a best place for engine, different ground clearance has great impact on the result of simulation, selecting the removal mode of the cooling air in engine cabin has to consider both the drag coefficient and lift coefficient.