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Exploratory Experimental Studies of Forces and Flow Structure on a Bluff Body with Variable Diffuser and Wheel Configurations
Technical Paper
2008-01-0326
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper summarizes an experimental study of an isolated bluff body in ground effect and the same body with the addition of nearby non-rotating wheels. First, theoretical and experimental trends relating to ground proximity and diffuser mechanics are reviewed. Next, experimental forces and flow patterns for a body alone were found, resulting in a maximum lift coefficient of approximately 0.80. Subsequently, the addition of stationary wheels, not attached to the body, significantly diminished the downforce generation by as much as 65%. Quantitative trends as well as tuft and neutrally buoyant bubble flow observations were carried out to infer the appropriate flow physics. Specifically, it is concluded that the wheels decrease body downforce by impeding the creation of strong vortices in the diffuser, deflecting flow in a potential manner, and introducing energy dissipating wake turbulence into the diffuser. Comparison to computational work performed by Desai, et al. (2008) correlated well with the wind tunnel data and subsequent conclusions. Future work is proposed.
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Citation
Breslouer, O. and George, A., "Exploratory Experimental Studies of Forces and Flow Structure on a Bluff Body with Variable Diffuser and Wheel Configurations," SAE Technical Paper 2008-01-0326, 2008, https://doi.org/10.4271/2008-01-0326.Also In
References
- Cooper, Kevin 1998 The Aerodynamic Performance of Automotive Underbody Diffusers SAE Paper 980030
- Cogotti, A. 1983 Aerodynamic Characteristics of Car Wheels. International Journal of Vehicle Design Special Publication SP3 1983
- Desai, Sachin Lo C.-M. B George, A. R. 2008 A Computational Study of Idealized Bluff Bodies, Wheels, and Vortex Structures in Ground Effect SAE Paper 2008-01-0327
- George, Albert 1979 Aerodynamics of Simple Bluff Bodies including Effects of Body Shape, Ground Proximity, and Pitch ASME 1979
- George, Albert R. Donis, J.E. 1983 Flow Patterns, Pressures, and Forces on the Underside of the Idealized Ground Effect Vehicles Aerodynamics of Transportation II - FED, 7, ASME H00282 Morel T. Miller J. ASME New York 69 79
- Mahon, S. Zhang X. Gage C. 2004 “The evolution of edge vortices underneath a diffuser equipped bluff body,” 12th International Symposium on Applications of Laser Techniques to Fluid Mechanics 1 10 Lisbon, Portugal 2004
- Ruhrmann, Andreas Zhang X. 2003 “Influence of Diffuser Angle on Bluff Body in Ground Effect,” ASME J. Fluids Eng. 125 332 338 American Society of Mechanical Engineers New York, NY, USA 2003