By G. Sovran (auth.), Gino Sovran, Thomas Morel, William T. Mason Jr. (eds.)
These court cases include the papers and oral discussions provided on the Symposium on AERODYNAMIC DRAG MECHANISMS of Bluff our bodies and street Vehides held on the common cars examine Laboratories in Warren, Michigan, on September 27 and 28, 1976. This foreign, invitational Symposium was once the 20 th in an annual sequence, each having been in a distinct technical self-discipline. The Symposia offer a discussion board for parts of technological know-how and know-how which are of well timed curiosity to the examine Laboratories as weIl because the technical neighborhood at huge, and within which team of workers of the Laboratories are actively concerned. The Symposia provide a chance for the alternate of principles and present wisdom among engaging study experts from academic, business arid governmental associations and serve to stimulate destiny study job. the current world-wide strength scenario makes it hugely fascinating to minimize the strength required to maneuver highway autos throughout the surroundings. an important volume of the entire power fed on for transportation is expended in overcoming the aerodynamic resistance to movement of those cars. mark downs during this aerodynamic drag can for that reason have a wide impression on floor transportation strength requisites. even though aerodynamic improvement paintings on highway vehides has been played for a few years, it has now not been generally stated or observed via a lot easy research.
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Additional info for Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles
Contour parameter, K, is smalI. In contrast, a standard car is characterized by a number of steep gradients in curvature, thus leading to a large value for the parameter /C. For the sake of completeness it must be added that a small value of /C is a necessary condition only; it is not sufficient for low air drag. In Fig. 34 the measured drag coefficient is plotted versus the contour parameter, K. During the numerical evaluation of /C, bumpers and underbody protuberances were neglected. A reasonable correlation between drag and the contour parameter was obtained.
1971), The Influence of Wind Tunnel Tests on Body Design, Ventilation and Surface Deposits of Serums and Sportcars, SAE 710212. Hoerner, S. J. Howel~ J. (1974), Wake Properties of a Saloon Car, Koll. Industrie Aerodynamik, Aachen, Part 3: Aerodynamik von Strassenfahrzeugen, pp. 85-95. -H. (1972), Einfluss der Vorderwagenform auf Widerstand, Giermoment und Seitenkraft von Kastenwagen, Zeitschrift fuer Flugwissenschaft, 20, pp. 341-351. , Janssen, L. , & Schwarz, G. (1975), The Wind Tunnel's Ground Plane Boundary Layer - Its Interference with the Flow Underneath Cars, SAE 750066.
E. tractors is sharp, and the gap at which the forward-facing-step separation disappears might be larger than that observed in Fig. 6; in addition, some roof-edge separation would probably remain throughout the range of gaps. 53 TRUCK AND BUS DRAG The tractor had a maximum beneficial effect on the drag of the combination at zero gap. Drag is plotted as a function of gap in Fig. 7. The shielding effect decreased as the gap increased and "exposed" increasing amounts of the trailer face to the approaching flow.
Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles by G. Sovran (auth.), Gino Sovran, Thomas Morel, William T. Mason Jr. (eds.)