Abstract: Automotive shark fins are an indispensable part of the vehicle, and their installation location will affect the vehicle flow field and resistance. For a car model, the effects of shark fins on the flow field around the car body, aerodynamic resistance and lift of the vehicle are discussed by numerical simulation technology. The original model is established by using SolidWorks, and the external flow field of the vehicle is simulated by computational fluid dynamics (CFD) and the drag and lift are calculated. On the basis of the original model, the shark fin is added, and the flow field is simulated and calculated. The research results show that the installation of shark fins at appropriate positions can reduce the aerodynamic drag and lift of the vehicle, and effectively narrow the tail vortex area of the vehicle. Therefore, it is recommended to ensure that the projected area is increased or unchanged to the maximum extent without affecting the line of sight of the rear window, so as to improve the vehicle performance.

Key words: car; shark fin; aerodynamic resistance; lift force; numerical simulation

摘要： 汽车鲨鱼鳍是车辆中不可或缺的部件，其安装位置会影响车辆流场和阻力。针对某轿 车车型，通过数值仿真技术探讨鲨鱼鳍对车身周围流场、整车气动阻力和升力的影响，使用 SolidWorks 建立原模型，采用计算流体动力学（CFD）的方法模拟车辆外部流场并计算阻力 和升力。在原模型的基础上，添加鲨鱼鳍，并进行流场模拟和计算。研究结果表明，在合适 的位置安装鲨鱼鳍能减小整车气动阻力和升力，并有效缩小汽车尾部涡流区域。因此，建议 在不影响后窗视线的情况下，最大限度保证投影面积少量增加或不变，以至于提升整车性能。

关键词: 轿车；鲨鱼鳍；气动阻力；升力；数值仿真