Abstract: Based on the racing car of the Formula Student China (FSC), the basic model of car body was established by using three-dimensional modeling software CATIA. A set of aerodynamic devices including the front wing, the diffuser and rear wing was designed. Then the FLUENT software was used to analyze the outflow field of the built racing car model. The aerodynamic performance of the racing car before and after refitting was compared and analyzed. The results show that after the aerodynamic devices are added to the racing car, though the whole car resistance is increased, aerodynamic lift features are changed from positive to negative, and the downforce is enhanced greatly, the lift drag ratio is increased obviously as well. Hence the aerodynamic performance and steering stability of racing car are improved. The rationality of the design scheme is further verified through experiment of the real car.

Key words: Racing car of formula student china; Aerodynamic devices; Field analysis; Lift drag ratio; Aerodynamic performance; CATIA; FLUENT

摘要： 针对中国大学生方程式赛车，运用三维建模软件 CATIA 建立车身的基本造型，设计一 套包括前鼻翼、扩散器和尾翼的空气动力学套件，采用 FLUENT 软件对建立的整车模型进行 外流场分析，对比分析改装前后赛车的气动性能。分析结果表明，在赛车上加装空气动力学 套件后，虽然整车阻力有所增加，但赛车的气动升力特性由正变为负，下压力大幅度增加， 整车升阻比提升明显，赛车的气动性能和操纵稳定性得到提高。通过实车实验，进一步验证 了该设计方案的合理性。

关键词: 中国大学生方程式赛车；空气动力学套件；流场分析；升阻比；气动性能；CATIA； FLUENT