Airfoil Plan-View Body Shapes to Reduce Drag at Yaw

Paper #:
  • 900314

Published:
  • 1990-02-01
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.
Pages:
12
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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