Proceedings Article10.4271/840300
Some salient features of the time - averaged ground vehicle wake
S.R. Ahmed,G. Ramm,G. Faltin +2 more
- 01 Feb 1984
- Vol. 840300
1.1K
TL;DR: In this paper, a basic ground vehicle type of bluff body, the time averaged wake structure is analyzed for low and high wake flow for the low drag and high drag configurations is described.
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Abstract: For a basic ground vehicle type of bluff body, the time averaged wake structure is analysed. At a model length based reynolds number of 4.29 million, detailed pressure measurements, wake survey and force measurements were done in a wind tunnel. Some flow visualisation results were also obtained. Geometric parameter varied was base slant angle. A drag breakdown revealed that almost 85% of body drag is pressure drag. Most of this drag is generated at the rear end. Wake flow exhibits a triple deck system of horseshoe vortices. Strength, existence and merging of these vortices depend upon the base slant angle. Characteristic features of the wake flow for the low drag and high drag configurations is described. Relevance of these phenomena to real ground vehicle flow is addressed.
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References
The Effect of Base Slant on the Flow Pattern and Drag of Three-Dimensional Bodies with Blunt Ends
T. Morel
- 01 Jan 1978
TL;DR: In this article, the effects of slanting the blunt base of three-dimensional bodies having either an axisymmetric or a rectangular cross section were investigated, and it was found that base slant can have a very dramatic effect on body drag, particularly in a relatively narrow range of slant angles.
104
Influence of Base Slant on the Wake Structure and Drag of Road Vehicles
TL;DR: In this paper, 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.
93
The Aerodynamic Drag of Cars Current Understanding, Unresolved Problems, and Future Prospects
W. H. Hucho
- 01 Jan 1978
TL;DR: An introduction to the drag-related aerodynamics of cars from a practitioner's point of view is presented in this paper, where current understanding and unresolved problems are elucidated with the aid of examples from design work carried out on cars now on the road.
21