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Drag Reduction of a Cube-Type Truck Configuration Through Boundary-Layer Control: Experiments and Prototype Road Tests
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Abstract
The paper presents results of an organized and extensive wind tunnel test-program, complemented by flow visualization and full-scale road tests, aimed at assessing the effectiveness of a boundary-layer control procedure for the drag reduction of a cube-van. Wind tunnel results, obtained using 1/6 scale model, at a subcritical Reynolds number of 105, suggest that tripping of the boundary-layer using fences reduce the pressure drag coefficient. The entirely passive character of the procedure is quite attractive from the economic consideration as well as the ease of implementation. The road tests with a full-size cube-van substantiated the trends indicated by the fence data; although the actual drag reduction observed was lower (yet quite significant, 16.6%) than that predicted by the wind tunnel tests. This may be attribute to a wide variety of factors including the differences in the geometry and test conditions. Fuel consumption results also substantiated the drag reduction trend. It is concluded that fences can lead to a significant reduction in the drag and fuel consumption when applied to flat-faced trucks if positioned correctly. They represent an elegant, versatile, and economical approach to improve the truck performance.
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Modi, V., St. Hill, S., and Yokomizo, T., "Drag Reduction of a Cube-Type Truck Configuration Through Boundary-Layer Control: Experiments and Prototype Road Tests," SAE Technical Paper 931893, 1993, https://doi.org/10.4271/931893.Also In
References
- Simanaitis, D., “Reduced Resistance Equals Increased Miles per Gallon,” Road and Track, June 1980, pp. 88-90.
- McDonald, A.T., et al., “Truck and Bus Aerodynamics Investigated,” Automotive Engineering, Society of Automotive Engineers, Vol.88, No.11, November 1980, pp.50-57.
- Goldstein, S., Modern Developments in Fluid Mechanics, Vols. I and II, Oxford University Press, 1938.
- Lachmann, G.V., Boundary Layer and Flow Control, Vols. I and II, Pergamon Press, 1961.
- Rosenhead, L., Laminar Boundar Layers, Oxford University Press, 1966.
- Schlichting, H., Boundary Layer Theory. Mcgraw-Hill Book Co., 1968.
- Chang, P.K., Separation of Flow, Pergamon Press, 1970.
- Modi, V.J., Sun, J.L C., Akutsu, T., Lake, P., Mcmillan, K., Swinton, P.G., and Mullins, D., “Moving Surface Boundary Layer Control for Aircraft Operation at High Incidence,” Journal of Aircraft, Vol. 18. No. 11, November 1981, pp. 963-968.
- Mokhtarian, F., and Modi, V.J., “Fluid Dynamics of Airfoil with Moving Surface Boundary Layer Control,” AIAA Atmospheric Flight Mechanics Conference, August 1986, Paper No. 86-2184-CP; also Journal of Aircraft, Vol. 25. No. 2, February 1988, pp. 163-169.
- Mokhtarian, F., Modi, V.J., and Yokomizo, T., “Rotating Air Scoop as Airfoil Boundary-layer Control,” Journal of Aircraft, Vol. 25, No. 10, October 1988, pp 973-975.
- Mokhtarian, F., Modi, V.J., and Yokomizo, T., “Effect of Moving Surfaces on the Airfoil Boundary-layer Control,” AIAA Atmospheric Flight Mechanics Conference, Minneapolis, Minnesota, August 1988, Paper No. AIAA-88-4303-CP; also Proceedings of the Conference, Editors: Holdway R. and Kaufman B., AIAA Publisher, pp.660-668; also Journal of Aircraft, Vol. 27, No. 1, January 1990, pp. 44-50.
- Ying, B., Boundary-Layer Control of Bluff Bodies with Application to Drag Reduction of Tractor-Trailer Truck Configurations, M.A.Sc. Thesis, The University of British Columbia, Vancouver, B.C., Canada, December 1991.
- Sovaran, G., Morel, T., and Mason, T.W., Jr., “Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles,” Proceedings of the Symposium held at the General Motors Research Laboratories, Plenum Press, New York, 1978.
- Koernig-Facsenfeld, F.R., Aerodynamik des krafthahrzeugs: Verlay der Motor-Rundschau, Umshau Verlag, Frankfurt, West Germany, First Edition 1951, Reprinted 1980.
- Kramer, C., and Gerhardt, H.J., “Road Vehicle Aerodynamics,” Proceedings of the 4th Colloquium on Industrial Aerodynamics, Aachen June, 1980.
- Kurts, D.W., Aerodynamic Design of Electric and Hybrid Vehicles: A guidebook, U.S. Department of Energy, Report No. 5030-471, September 1980.
- Bearman, P.W., “Review-Bluff Body Flows Applicable to Vehicle Aerodynamics,” Transactions of ASME, Journal of Fluids Engineering, Vol. 102, September 1980, pp. 265-274.
- St. Hill, S., Drag Reduction of Cube-Van Through Boundary-Layer Control: Wind Tunnel Experiments and prototype Road Tests, M.A.Sc. Thesis, The University of British Columbia, Vancouver, B.C., Canada, December 1992.
- Watkins, S., Saunders, J.W., and Hoffman, P.H., “Wind Tunnel Modelling of Commercial Vehicle Drag Reducing Devices: Three Case Studies,” Society of Automotive Engineers, Paper No. 870717, 1987.
- Drollinger, R.A., “Heavy Truck Aerodynamics,” Society of Automotive Engineers, Paper No. 870001, 1987.