Lap Simulation of Coupling Change of Aerodynamic Parameters and Body Attitude

Abstract:

A lap simulation study was conducted taking Formula Racing of college students as the object. By comprehensively considering the relationship between ground clearance and yaw angle and the drag coefficient and lift coefficient， the influence of body attitude change on aerodynamic characteristics of formula racing was studied combining experiment with numerical simulation. First， the existing vehicle aerodynamic model was modified. Then， the Longge-Kuta method was used to simulate the lap speed of the speed integral， which was compared with the simulation results of the commercial software Optimumlap. The results show that the model based on the coupling relationship between aerodynamic parameters and body attitude can more accurately describe lap simulation. Besides， ignoring the effect of aerodynamic changes， the grip of the tire during cornering will be overestimated， and the acceleration performance without considering the load transfer will be underestimated， thus overestimating the effect of drag on lap speed. Moreover， considering the model of load transfer， different tracks are found to have different sensitivities to drag. The lap simulation model provides reference for improving the aerodynamic design of racing cars.