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International Journal of Automotive Technology > Volume 18(3); 2017 > Article
International Journal of Automotive Technology 2017;18(3): 397-404.
doi: https://doi.org/10.1007/s12239-017-0040-6
AERODYNAMIC STUDY OF A GENERIC CAR MODEL WITH WHEELS AND UNDERBODY DIFFUSER
Angel Huminic, Gabriela Huminic
Transilvania University of Brasov
ABSTRACT
Being a continuous subject of research, this study presents new aspects regarding the relevance of underbody diffusers in road vehicle aerodynamics. Using a generic car model on wheels as a reference, the effect of the wheels on the body fitted with an underbody diffuser was studied, where the diffuser length and angle were varied within ranges which are applicable for hatchback passenger cars. The results show that the vortices which originate from the rear wheelhouses have a major impact on the aerodynamics of the underbody diffuser, which results in increasing of drag and lift of the body. For cases studied, the average drag and lift increment due to the addition of wheels were (ΔcD)mean = 0.058, respectively (ΔcL)mean = 0.243. The lift of the body on wheels decreases with both diffuser length and diffuser angle, and there are situations when it may become negative as for a body without wheels. The results show also the possibility to reach a minimum drag according with normalised diffuser length.
Key Words: Automobile, Underbody diffuser, Aerodynamics
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