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Model Scale Based Process for the Development of Aerodynamic Tire Characteristics
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
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The geometric shape of the tires can have a large influence on the aerodynamic drag of a passenger car as it has been shown already in different publications like for example [1, 2, 3]. However, to optimize the shape of a tire, nowadays quite some effort is needed in terms of wind tunnel time and costs for prototype tires. In this paper an approach to optimize the tire's shape in model scale is described, which can help to reduce both development time and costs.
The first step in the development of this method was to verify that the aerodynamic effects of the tire geometry in model scale are comparable to full scale tests. This was achieved by measuring different production tires in full scale and also by measuring the quarter scale version of the same tires. The only difference between the original and the model scale tires was that the scaled tires were not deformable. The results show that the difference between two sets of tires is comparable in full scale and in quarter scale.
After validating this approach, several model scale tires with different geometries were manufactured and their influences on the aerodynamic forces were investigated. The results show that the aerodynamic efficiency of the tire can often be improved, when the outward shoulder of the tires on the front axle is smoothed. With only minor changes on a production tire, the aerodynamic drag of a vehicle can vary by more than ΔcD = 0.009.
CitationWittmeier, F., Kuthada, T., Widdecke, N., and Wiedemann, J., "Model Scale Based Process for the Development of Aerodynamic Tire Characteristics," SAE Technical Paper 2014-01-0585, 2014, https://doi.org/10.4271/2014-01-0585.
- Wittmeier, F.; Widdecke, N.; Wiedemann, J.; Lindener, N.; Armbruster, R.: Reifenentwicklung unter aerodynamischen Aspekten. In: ATZ, 02.2013.
- Landstrom, C., Josefsson, L., Walker, T., and Lofdahl, L., “Aerodynamic Effects of Different Tire Models on a Sedan Type Passenger Car,” SAE Int. J. Passeng. Cars - Mech. Syst. 5(1):136-151, 2012, doi:10.4271/2012-01-0169.
- Modlinger, F.; Demuth, R.; Adams, N.: Investigations on the Realistic Modeling of the Flow around Wheels and Wheel Arches by CFD. In: JSAE Annual Congress, Yokohama, Japan, JSAE Paper No. 20075195, (2007).
- Wickern, G., Zwicker, K., and Pfadenhauer, M., “Rotating Wheels - Their Impact on Wind Tunnel Test Techniques and on Vehicle Drag Results,” SAE Technical Paper 970133, 1997, doi:10.4271/970133.
- Wiedemann, J., “The Influence of Ground Simulation and Wheel Rotation on Aerodynamic Drag Optimization - Potential for Reducing Fuel Consumption,” SAE Technical Paper 960672, 1996, doi:10.4271/960672.
- Wittmeier, F.; Widdecke, N.; Wiedemann, J.: Reifenentwicklung unter aerodynamischen Aspekten. FAT Schriftenreihe Nr. 252, Forschungsvereinigung Automobiltechnik, VDA, 2013.
- Wittmeier, F.; Widdecke, N.; Wiedemann, J.: Tyre Development from an Aerodynamic Perspective. In: 13th Stuttgart International Symposium: Automotive and Engine Technology. ATZ live, 2013.
- Potthoff, J.; Wiedemann, J.: Die Straßenfahrtsimulation in den IVK Windkanälen - Ausführung und erste Ergebnisse. In: In: Bargende, M.; Wiedemann, J. (Hrsg.): 5. Internationales Symposium, Expert Verlag, Rennignen, 2003. ISBN: 3-8169-2180-9.
- Wäschle, A.: Numerische und experimentelle Untersuchung des Einflusses von drehenden Rädern auf die Fahrzeugaerodynamik. Stuttgart: Expert Verlag, 2006, ISBN 978-3-8169-2659-7.
- Mlinaric, P.: Investigation of the Influence of Tyre Deformation and Tyre Contact Patch on CFD Predictions of Aerodynamic Forces on a Passenger Car, Master Thesis, Chalmers University. Göteborg: 2007.
- Fackrell, J.; Harvey, J.: The Aerodynamics of an Isolated Road Wheel. In: Proceedings of the Second AIAA Symposiom of Aerodynamics of Sports and Competition Automobiles, (1974).