The Overall Car Body Of FSC Aerodynamic Shape Optimization

The car body of FSC with low air drag coefficient can make the car on the road by smaller air drag around the body, thus improving the car drag racing in the range of the highest speed and endurance, get better grades. So the car body aerodynamic optimization design is an important one. The race cars not only need low air resistance coefficient, but also need to satisfy the frame structure constraint. In order to consider the two requirements, this paper references the ideal form design method and the whole optimization method from the Angle of the whole car body design and optimization. The overall body aerodynamic shape optimization design method the application of The FSC car.Research steps as follows: 1) Creating the ideal form of 3D model with low air resistance coefficient by referencing known ideal form; 2) Verifying the ideal form low gas resistance performance by CFD simulation software, 3)To extract the ideal model shape characteristic curve. 4) According to the feature points of the frame structure,create the frame structure curve; 5)Fusing the ideal characteristic curve and the car frame structure curve, generate the race car body characteristic curve and establish the race car geometric model; 6) Simulate the running of race car in the air and obtain aerodynamic performance parameters of the race car。By using the whole optimization method to optimize the car body shape; 7) After simulating the race car,optimize the race car shape and comparison result between the first generation race car and the race car of this paper。From the research results show that the fusion curve through the ideal form the mathematical models of the car body geometry, have the low gas drag coefficient features of the ideal form. At the same time in the process of optimization, the use of whole optimization method to optimize the body, greatly reduce the workload of optimization, to improve the design efficiency, and reduce the interference between the local optimization. Finally, according to the CFD simulation results contrast application of pneumatic modelling method for the optimization design of the overall design of the body from the previous generation of design scheme, air resistance coefficient reduced by 12.5%.