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Comparison of Various Drag Reduction Devices and Their Aerodynamic Effects on the DrivAer Model

Journal Article
06-11-03-0019
ISSN: 1946-3995, e-ISSN: 1946-4002
Published July 05, 2018 by SAE International in United States
Comparison of Various Drag Reduction Devices and Their Aerodynamic
                    Effects on the DrivAer Model
Sector:
Citation: Cho, J., Park, J., Yee, K., and Kim, H., "Comparison of Various Drag Reduction Devices and Their Aerodynamic Effects on the DrivAer Model," SAE Int. J. Passeng. Cars - Mech. Syst. 11(3):225-238, 2018, https://doi.org/10.4271/06-11-03-0019.
Language: English

Abstract:

In this study, two types of drag reduction devices (a horizontal plate, and a vertical plate) are used to weaken the downwash of the upper flow and c-pillar vortex of the DrivAer notchback model driving at high speed (140 km/h). By analyzing and comparing 15 cases in total, the aerodynamic drag reduction mechanism can be used in the development of vehicles. First, various CFD simulation conditions of a baseline model were compared to determine the analysis condition that efficiently calculates the correct aerodynamic drag. The vertical plate and horizontal plate applied in the path of the c-pillar vortex and downwash suppressed vortex development and induced rapid dissipation. As a result, the application of a 50-mm wedge-shaped vertical plate to the trunk weakened the vortex and reduced the drag by 3.3% by preventing the side flow from entering the trunk top. The installation of a 150 mm horizontal plate at the trunk to decrease downwash reduced the drag by 5.1% by improving the bottom and side flow.