Influence of rear spoiler inclination on aerodynamics and stability of car

Abstract

The design of the vehicle has great influence on the aerodynamics and stability of the car. Today, how technology has achieved high level, traditional experiments performed on the road or in the laboratory can be replaced by virtual experiments. In order to reduce the time and costs for optimization of the rear spoiler setting angle, mainly specialized software for conducting virtual experiments were used. Determination of the optimal installation angle of the rear spoiler was performed by usage of the ANSYS software package, Fluid Flow CFX module. The angle of the spoiler starts from -15° ÷ 15°. Going from negative to positive angle (negative mathematical direction), lift force decreases, while this is not the case with aerodynamic force. However, the difference between the maximum and minimum aerodynamic force is about 12 N, which is negligible. While the difference between the maximum and minimum values of buoyancy force is about 130 N. So it is concluded that it is best to install the rear spoiler at 15° angle.