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Aerodynamic Drag of Bluff Body Shapes Characteristic of Hatch-Back Cars
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Abstract
The flow around a bluff body with a slanted rear surface is influenced very dramatically by changing the angle of the rear surface slant and at some slant angles an excessively high drag is generated. To learn more about this critical behavior a series of detailed experiments was conducted on a vehicle-like bluff body, investigating the effect of ground proximity, Reynolds number, free-stream turbulence and of rounding of the upper edge of the slanted surface. The results of these experiments showed that although these various factors could change the critical slant angle and the size of the drag overshoot, the basic critical behavior was always present.
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Citation
Morel, T., "Aerodynamic Drag of Bluff Body Shapes Characteristic of Hatch-Back Cars," SAE Technical Paper 780267, 1978, https://doi.org/10.4271/780267.Also In
References
- Janssen L. J. Hucho W. H. Kolloquium ueber Industrie-aerodynamik Aachen 46 49 1974
- Morel T. “The Effect of Base Slant on the Flow Pattern and Drag of 3-D Bodies with Blunt Ends.” Proceedings of the Symposium on Aerodynamic Drag Mechanisms Sovran G. Morel T. Mason W. T. Plenum Press 1977
- Bearman P. W. “Some Effects of Free-Stream Turbulence and the Presence of the Ground on the Flow Around Bluff Bodies.” Proceedings of the Symposium on Aerodynamic Drag Mechanisms Sovran G. Morel T. Mason W. T. Plenum Press 1977
- Mason, W. T. Jr. Beebe P. S. Schenkel F. K. “An Aerodynamic Test Facility for Scale-Model Automobiles.” SAE Paper No. 730238 1973
- Tuck E. O. “Irrotational Flow Past Bodies Close to a Plane Surface.” Journal of Fluid Mechanics 50 481 491 1971