Aerodynamics Kits Design For Formula SAE Race Car Based On CFD

Following the rules of Formula Student China(FSC),this paper optimized the design of aerodynamics kits for Chongqing University Formula SAE race car based on numerical simulation of computational fluid dynamics(CFD).Optimizing the design of the aerodynamic kits can effectively improve the performance of the Formula SAE(FSAE)race car.In 2015 season,Profili and Xfoil were used to choose the wing sections and optimize the attack angles.In this paper,CATIA were used to build models of front wing,rear wing,diffuser,etc.An in-depth study is undertaken to analyze the flow field around the formula car in the rectangular parallelepiped wind tunnel simulation via numerical simulations.Because of the further restrictions of aerodynamic kits from the rules of formula student China in 2016,this paper takes the lead in using the curved wings to optimize front wing and rear wing.Based on the straight wing design of Chongqing University FSAE car,artificial modification and local optimization are the primary methods for designing.The results show that:(1)The lift coefficient and drag coefficient of the joined-wing are changed with the position of itself.Main variables include relative attack angle,gap and longitudinal separation.The flap attack angle increases with the increasing attack angle of the main wing.(2)The lift coefficient and drag coefficient are changed when curved rear wings are used.And rear wing which contains a main straight wing and upwarp flap get the maximum downforce.A sword cured front wing can decrease the front car body drag.(3)The diffuser can improve the downforce effectively.With the DRS,a rear wing can optimize the flow field around the formula car.During two seasons of formula student China,this paper optimize the aerodynamic kits design for Chongqing University Formula SAE racing car.The downforce coefficient is improved to 1.68 and downforce-drag ratio is improved to 1.91..