Volume 2 · Issue 3 (2025)
Numerical Assessment of Spoiler Angle Effects on Aerodynamic Performance of the Sedan Cars Using Computational Fluid Dynamics
Hanyun Yang
Beijing City International School, Beijing, China
Abstract: Optimizing aerodynamic design has become a key focus in automotive engineering as it plays a crucial role in improving fuel efficiency. This study employs the Computational Fluid Dynamics (CFD) method to investigate the effect of spoiler angles on the drag and lift coefficient of a sedan car for optimal performance. Airflow field information including pressure, velocity and turbulent kinetic energy around the car body is carefully visualized and analyzed. The drag and lift coefficients are quantified across different spoiler angles, revealing their effects on aerodynamic performance. Quantitative analysis shows that the drag coefficient increased by up to 178.6%, while the lift coefficient improved (became more negative) by 245.2% across the tested angles. A spoiler angle of 15° to 25° is expected to provide the most effective trade-off as it offers significant downforce enhancement with a relatively moderate increase in drag. These findings are expected to offer insights for designing spoilers that enhance vehicle efficiency, stability, and overall performance.
Keywords: CFD; Car; Aerodynamics; Drag and Lift Coefficient; Fuel Saving
References
[1]
Granados-Ortiz F J, Morales-Higueras P, Ortega-Casanova J. 3D CFD simulation of the interaction between front wheels&brake ducts and optimised five-element F1 race car front wings under regulations. Alexandria engineering journal, 2023, 69: 677-698.
[2]
Wang C, Wood J, Wang Y, et al. CO2 emission in transportation sector across 51 countries along the Belt and Road from 2000 to 2014. Journal of Cleaner Production, 2020, 266: 122000.
[3]
Wang S, Ge M. Everything you need to know about the fastest-growing source of global emissions: Transport[J]. World Resources Institute, 2019, 16.
[4]
Ritchie H. Cars, planes, trains: where do CO₂ emissions from transport come from? Our world in data, 2020.
[5]
Tiseo I. Distribution of carbon dioxide emissions produced by the transportation sector worldwide in 2020, by subsector. Statista, 2023.
[6]
Naidu S C V R M, Madhavan V M, Chinta S, et al. Analysis of aerodynamic characteristics of car diffuser for dissimilar diffuser angles on Sedan’s using CFD. Materials Today: Proceedings, 2023, 92: 240-248.
[7]
Selvam M A J, Kumar M R, Padmanabhan S, et al. Analyzing the downforce generated by rear spoiler of hatchback vehicle and creating an aeromapp using CFD analysis. Materials Today: Proceedings, 2023, 92: 48-55.
[8]
Cheng S Y, Chin K Y, Mansor S, et al. Experimental study of yaw angle effect on the aerodynamic characteristics of a road vehicle fitted with a rear spoiler. Journal of Wind Engineering and Industrial Aerodynamics, 2019, 184: 305-312.
[9]
Amer M, Yang C C, Chen H Y, et al. Experimental Investigation of a Spoiler’s Impact on the Flow Pattern of a High-Speed Sport Car. Journal of Mining and Mechanical Engineering, 2020, 1(2): 73-84.
[10]
Zaareer M N M, Mourad A H I, Darabseh T, et al. Impact of a vehicle exhaust pipe position on the lift and drag coefficients: 2D and 3D simulations. International Journal of Thermofluids, 2023, 18: 100321.
[11]
Wang G, Yang F, Wu K, et al. Estimation of the dissipation rate of turbulent kinetic energy: A review. Chemical Engineering Science, 2021, 229: 116133.
[12]
Lueck R. Calculating the rate of dissipation of turbulent kinetic energy. Rockland Scientific International Tech. Note TN-028, 2013, 18.
[13]
Vassilicos J C. Dissipation in turbulent flows. Annual review of fluid mechanics, 2015, 47(1): 95-114.
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