Influence of Base Slant on the Wake Structure and Drag of Road Vehicles

[+] Author and Article Information
S. R. Ahmed

Institut für Entwurfsaerodynamik, DFVLR, Braunschweig, West Germany

J. Fluids Eng 105(4), 429-434 (Dec 01, 1983) (6 pages) doi:10.1115/1.3241024 History: Received April 26, 1982; Online October 26, 2009


The time averaged wake structure of a realistically dimensioned quarter scale automobile model was studied in a wind tunnel on the basis of flow visualization, wake surveys, force and pressure measurements. Through a systematic variation of base slant angle in the range of 0 to 40 deg, the ensuing changes in the wake structure were observed and the wake structure present at lowest value of aerodynamic drag is shown. Experimental data were obtained at a model length based Reynolds number of 4.29 million. Correlation of wake structure with drag, pressure distribution, and kinetic energy content of vortex motion in wake is addressed.

Copyright © 1983 by ASME
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