中文摘要：

以简化的轿车模型为研究对象,以计算流体力学软件ANSYS-FLUENT为研究工具对轿车的气动特性进行了研究.计算了加装扰流装置前和加装扰流装置后的车身阻力系数和升力系数.分析了三种造型的扰流装置对轿车气动特性的影响.计算结果表明：扰流装置的加装可以改善轿车尾部流场结构,轿车尾部区域涡流现象和倒流现象均明显减弱;加装不同扰流板均会不同程度地增加轿车的阻力系数,但同时可以减小轿车升力系数,进而一定程度改善汽车的空气动力学特性.

英文摘要：

The aerodynamic characteristics of a simplified car with spoiler device were studied with computational fluid dynamics software ANSYS-FLUENT. The drag and lift coefficient of the car with spoiler device were calculated. The aerodynamics of cars with three kinds of spoiler device was analyzed. Results showed that the spoiler device could improve the flow distribution and vortex and baekflow of car tail region were reduced significantly. Drag coefficient of car will be increased to different degrees because of retrofitting various spoilers, but at the same time lift coefficient of car will be reduced. Aerodynamic characteristics were enhanced to some extent.