| Abstract [eng] |
It's been a long time since car manufacturers have noticed the impact of aerodynamics on the dynamic performance of cars. Motorsport also tries to exploit aerodynamic advantages as much as possible. When motorsport started to develop, there was an initial attempt to make sports cars as sleek as possible, more like a drop shape. However, the advantages of downforce were later discovered, allowing the car to be quicker around corners. Later still, these discoveries were applied to everyday cars. In this paper we will look at one of the main aerodynamic devices in a sports car, the rear wing / spoiler. The object of the study – the rear wing / spoiler of a sports car The aim of the study – to perform an aerodynamic analysis of the rear fairing of a sports car The study was based on the requirements for the rear wing of the Time Attack Pro class of the 2024 Time Attack Lithuanian Championship. This paper reviews the different types of rear wings and spoilers, it has been found that the pedestal type of rear wing can have the greatest influence on the dynamics of the car, and this is the type of rear wing has been chosen for analysis in this study. The theoretical part of the thesis reviews scientific papers on the influence of the shape of the airfoil and the angle of attack on the performance of the wing. In the design part, the wing configuration is developed using an analysis of information sources. The wing is manufactured using a 1660 mm wide upside down MSHD airfoil with a chord length of 200 mm and a top-mounting method. Also, the area of the endplates has been calculated. In the investigation part, it is calculated that the wing will be used for a Reynolds number in the range 277500 to 695000. Then, the most suitable position for the wing on the Mazda MX-5 NB was selected by CFD simulation using SolidWorks Flow Simulation software. The effect of the wing angle of attack on the drag and lift coefficients of the vehicle in the range of -5º to 60º was also investigated. The minimum lift coefficient for the wing angle of attack at 40º was determined. Based on the results obtained, a recommendation to the end user of the wing was made. It is also recommended that additional aerodynamic elements be used with the rear fairing and in the front part of the vehicle. |
