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Influences of Different Front and Rear Wheel Designs on Aerodynamic Drag of a Sedan Type Passenger Car
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2011 by SAE International in United States
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Efforts towards ever more energy efficient passenger cars have become one of the largest challenges of the automotive industry. This involves numerous different fields of engineering, and every finished model is always a compromise between different requirements. Passenger car aerodynamics is no exception; the shape of the exterior is often dictated by styling, engine bay region by packaging issues etcetera. Wheel design is also a compromise between different requirements such as aerodynamic drag and brake cooling, but as the wheels and wheel housings are responsible for up to a quarter of the overall aerodynamic drag on a modern passenger car, it is not surprising that efforts are put towards improving the wheel aerodynamics. The actual force on the wheels is typically not a full quarter of the overall drag, but as the wheels strongly interact with several other key flow features such as cooling air flow, underbody flow and the base wake, the wheels have a large influence on the overall aerodynamic performance of the vehicle.
This study investigates the potential of different wheel design parameters focusing on reduced aerodynamic drag. A correlation with experimental measurements on a full size vehicle is presented and several additional configurations are analyzed numerically using a standard automotive CFD approach. Furthermore, the potential of optimizing the front and rear wheels individually is investigated to some extend.
Results show that closing most of the rear wheels results in local drag reductions along the rear end underbody, rear wheels and vehicle base. The fully covered rear wheel typically reduced base drag between 6-7 drag counts. Effects of covering the front wheels were more complex as both upstream and downstream flow regions were affected, and it was shown that for the vehicle investigated in this study a limited amount of outer radial covering of the wheel gave the largest drag reduction. The investigation of using different front and rear wheel designs showed that this concept have potential in reducing overall drag as it generated the largest drag reduction in this study of approximately 22 drag counts.
CitationLandström, C., Walker, T., Christoffersen, L., and Löfdahl, L., "Influences of Different Front and Rear Wheel Designs on Aerodynamic Drag of a Sedan Type Passenger Car," SAE Technical Paper 2011-01-0165, 2011, https://doi.org/10.4271/2011-01-0165.
Vehicle Aerodynamics, 2011
Number: SP-2305; Published: 2011-04-12
Number: SP-2305; Published: 2011-04-12
- U.S. Energy Information Administration - EIA 2010 International Energy Outlook - Transportation http://www.eia.doe.gov/oiaf/ieo/transportation.html 2010 11 30
- Hucho, W. H. Aerodynamik des Automobiles 5 0-7680-0029-7 2005
- Fackrell, J.E. Harvey, J.K. The Aerodynamics of an Isolated Road Wheel The Second AIAA Symposium On Aerodynamics Of Sports & Competition Automobiles 6 May 11 Los Angeles, California 1974
- Pfadenhauer, M. Wickern, G. Zwicker, K. On the Influence of Wheels and Tyres on the Aerodynamic Drag of Vehicles MIRA International Conference on Vehicle Aerodynamics, Proc. The Engineer October 1996
- Wiedemann, J. “The Influence of Ground Simulation and Wheel Rotation on Aerodynamic Drag Optimization - Potential for Reducing Fuel Consumption,” SAE Technical Paper 960672 1996 10.4271/960672
- Mercker, E. Breuer, N. Berneburg, H. Emmelmann, H.J. “On the Aerodynamic Interference Due to the Rolling Wheels of Passenger Cars,” SAE Technical Paper 910311 1991 10.4271/910311
- Modlinger, F. Adams, N. “New Directions in the Optimization of the Flow around Wheels and Wheels Arches” 7th MIRA International Vehicle Aerodynamics Conference 15 16 October Warwickshire, UK 2008
- Qui, Z. Landström, C. Löfdahl, L. Josefsson, L. Wheel Aerodynamic Developments on Passenger Cars by Module-based Prototype Rims and Stationary Rim Shields FISITA Automotive World Congress Budapest 2010
- Landström, C. Löfdahl, L. Walker, T. “Detailed Flow Studies in Close Proximity of Rotating Wheels on a Passenger Car,” SAE Int. Passeng. Cars - Mech. Syst. 2 1 861 874 2009 10.4271/2009-01-0778
- Christoffersen, L. Landström, C. Walker, T. “A Wind Tunnel Study Correlating the Aerodynamic Effect of Cooling Flows for Full and Reduced Scale Models of a Passenger Car,” SAE Technical Paper 2010-01-0759 2010 10.4271/2010-01-0759
- Sternéus, J. Walker, T. Bender, T. “Upgrade of Volvo Cars Aerodynamic Wind Tunnel,” SAE Technical Paper 2007-01-1043 2007 10.4271/2007-01-1043
- Eng, M. P. Walker, T. Investigation of Aerodynamic Correction Methods Applied to a Slotted Wall Wind Tunnel Euromech Colloquium 509, External Aerodynamics of Railway Vehicles, Trucks, Buses and Cars Berlin Germany 2009
- Mlinaric, P. Investigation of the Influence of Tyre Deformation and Tyre Contact Patch on CFD Predictions of Aerodynamic Forces on a Passenger Car Masters Thesis Chalmers University of Technology Gothenburg, Sweden 2007
- Landström, C. Sebben, S. Löfdahl, L. Effects of wheel orientation on predicted flow field and forces when modelling rotating wheels using CFD 8th MIRA International Vehicle Aerodynamics Conference 13 14 October Warwickshire, UK 2010
- Qiu, Z. Wheel Aerodynamic Developments by Module-based Prototype Rims and Stationary Rim Shield Chalmers University of Technology Thesis work 2009:04 2009