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Airfoil Plan-View Body Shapes to Reduce Drag at Yaw
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English
Abstract
In the presence of ambient winds, almost all present vehicles experience an increase in aerodynamic drag, which in turn causes an increase in energy consumption. However, it is possible to design a vehicle body shape that passively uses the wind to decrease aerodynamic drag and hence lower fuel consumption. This paper describes a scale-model wind tunnel investigation that studied vehicle-like shapes which exhibit a drag reduction, rather than a drag penalty, in crosswinds. The aerodynamic behavior of very-low-aspect-ratio, truncated, vertical airfoil sections close to the ground was studied to obtain a general idea of the behavior of these vehicle-like shapes. Force and surface pressure studies established that a significant drag reduction at low yaw angles could be achieved by attached flow over the leeward airfoil nose. A demonstration of the use of the airfoil shape was carried out to show how the poor yaw performance of a representative Semi-Trailer transport may be improved by the use of a plan-view airfoil-shaped cab.
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Citation
Retzlaff, R. and Hertz, P., "Airfoil Plan-View Body Shapes to Reduce Drag at Yaw," SAE Technical Paper 900314, 1990, https://doi.org/10.4271/900314.Also In
References
- Carr, G.W. Aerodynamics as a Means to Vehicle Fuel Economy; Function Versus Appearance in Vehicle Design Mechanical Engineering Publications Limited for The Institution of Mechanical Engineers Conference Proceedings 61 1978
- Amick, J.L. Wind-powered car with Aerofoil System - Comprising of at Least One Vertical Aerofoil and One Lateral Aerofoil with retracting Mechanism U.S. Patent 4117900 1978
- Amick, J.L. Streamlined Low Fuel Consumption Three-Wheel Vehicle has Twin Rear Wheels enclosed by Fins Joined to Body Via Streamlined Struts U.S Patent 3804428 1974
- Amick, J.L. Stabilizing Aerfoil for Vehicles has Arcuate body with Lower Ends Attached to Vehicle U.S. Patent 4474401 1984
- Gerwing, D.H. McEachern, R.A. Retzlaff, R.N. Schultz, G.J. Beaudry, D.L. Watson, L.G. Hertz, P.B. Construction of ‘Nexus’ Vehicle; Transport Canada Contract No. OST84-00486 Vehicle Research Group Report University of Saskatchewan May 1986
- Retzlaff, R.N. Mitchell, D. Mechanical Engineering Wind Tunnel User's Manual University of Saskatchewan 1989
- Cooper, K.R. The Effect of Front-Edge Rounding and Rear-Edge Shaping on the Aerodynamic Drag of Bluff Vehicles in Ground Proximity Society of Automotive Engineers Technical Paper Series No 850288 1985
- Cooper, K.R. The Wind-Tunnel Simulation of Surface Vehicles Journal of Wind Engineering and Industrial Aerodynamics 17 1984 167 198
- Cooper, K.R. Wind Tunnel Investigations of Eight Commercially Avaible Devices for the Reduction of the Aerodynamic Drag of Trucks Roads and Transportation Association of Canada National Conference 1976
- Simu, E. Scanlan, R.H. Wind Effects on Structures, An Introduction to Wind Engineering John Wiley and Sons 1978
- Retzlaff R.N. Aerodynamic Characteristics of Wind Assisted Vehicle Shapes University of Saskatchewan 1989
- Marchman, J.F. Aerodynamic Testing at Low Reynolds Numbers Journal of Aircraft 24 2 February 1987