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. Using FLUENT software, the aerodynamic performance of different models of vehicle modeling, engine mounting position, ground clearance, cooling mode of engine compartment cooling air were simulated respectively.The results show that the most influential aerodynamic performance , The engine has the best placement position, and different ground clearances have a great influence on the simulation results. Considering the drag coefficient and the lift coefficient, the cooling mode of the engine compartment should be considered synthetically.