An Investigation Of The Different Diffuser Positions Effect On Vehicle Aerodynamic Performance

Year 2022, Volume: 6 Issue: 1, 75 - 82, 31.03.2022

Melek Çalışkan , Altuğ Bakırcı

https://doi.org/10.30939/ijastech..1073376

Cited By: 1

Abstract

Reducing fuel consumption, increasing road holding and overcoming air resistance are the main goals in the field of vehicle aerodynamics. Therefore, controlling the lift-ing forces is very important for vehicle stability. Generally, lifting forces are used as low as possible and an additional downforce is required in order to increase road holding. Various vehicle parts have been developed to control the airflow in passen-ger cars. One of them is the rear lower diffuser which is located on the floor of the ve-hicle. In this study, the length value of the base diffuser is kept constant as the base edge, and the effects of the diffuser location position on the lifting and drag force at 60 km/h with angles of 10º, 15º, 20º and 30º are investigated. These effects are also investigated comparatively according to flat-floor geometry. As a result of the study, it is observed that the use of the diffuser reduces the negative effects by changing the lifting force from positive to negative, and it provides a significant advantage in drag force compared to the flat-floor geometry, however, the angle changes do not have a significant effect.

Keywords

Diffuser, Diffuser angle, Aerodynamic, Lift force, Drag force

Thanks

We would like to thank Tübitak, who organized the Interna-tional Efficiency Challenge Electric Vehicle Races within the scope of Teknofest, for their encouragement in the preparation of this study.

References

• Zaareer M, Mourad AH. Effect of Vehicle Side Mirror Base Position on Aerodynamic Forces and Acoustics, Alexandria Eng J. 2022;61(2):1437–48.
• Morfeldt J, Davidsson Kurland S, Johansson DJA. Carbon footprint impacts of banning cars with internal combustion engines, Transp Res Part D Transp Environ. 2021;95(May):102807.
• Lander L, Kallitsis E, Hales A, Edge JS, Korre A, Offer G. Cost and carbon footprint reduction of electric vehicle lithium-ion batteries through efficient thermal management, Appl Energy. 2021;289(March):116737.
• Meyers RA, Elgowainy A. Encyclopedia of Sustainability Science and Technology Series: A Volume in the Encyclopedia of Sustaina-bility Science and Technology, Electric, Hybrid, and Fuel Cell Vehi-cles. New York, NY: Springer New York; 2021.
• Gao G, Li F, He K, Wang J, Zhang J, Miao X. Investigation of bogie positions on the aerodynamic drag and near wake structure of a high-speed train, J Wind Eng Ind Aerodyn. 2019;185(December 2018):41–53.
• Howell J, Sherwin C, Passmore M, Le Good G. Aerodynamic Drag of a Compact SUV as Measured On-Road and in the Wind Tunnel. SAE Tech. Pap., 2002.
• Baek SW, Lee SW. Aerodynamic drag reduction on a realistic vehicle using continuous blowing, Microsyst Technol. 2020;26(1):11–23.
• Plumejeau B, Delprat S, Keirsbulck L. Model free active flow control of a simplified car model, IFAC-PapersOnLine. 2019;52(5):115–20.
• Kurec K, Remer M, Mayer T, Tudruj S, Piechna J. Flow control for a car-mounted rear wing, Int J Mech Sci. 2019;152(June 2018):384–99.
• Qu X, Xie J. Simulation Analysis for Effect of Rear Structure of Hatchback Car on Rear Field Characteristics, J Phys Conf Ser. 2021;1815(1).
• Bearman P. Bluff Body Flows Applicable to Vehicle Aerodynamics, J Fluids Eng. 1980;102(265).
• Hucho WH, Sovran G. Aerodynamics of road vehicles 1993;485–537.
• Marklund J, Lofdahl L, Danielsson H, Olsson G. Performance of an Automotive Under-Body Diffuser Applied to a Sedan and a Wagon Vehicle, SAE Int J Passeng Cars - Mech Syst. 2013;6(1):293–307.
• Singh A, Jain A, Sharma A. Designing a 3-D Model of Bodywork of a Vehicle with Low Coefficient of Drag and High Downforce, Mater Today Proc. 2020;28:2197–204