By G. Sovran (auth.), Gino Sovran, Thomas Morel, William T. Mason Jr. (eds.)
These court cases include the papers and oral discussions awarded on the Symposium on AERODYNAMIC DRAG MECHANISMS of Bluff our bodies and highway Vehides held on the basic cars examine Laboratories in Warren, Michigan, on September 27 and 28, 1976. This overseas, invitational Symposium used to be the 20th in an annual sequence, every one having been in a distinct technical self-discipline. The Symposia supply a discussion board for components of technology and expertise which are of well timed curiosity to the study Laboratories as weIl because the technical neighborhood at huge, and during which group of workers of the Laboratories are actively concerned. The Symposia provide a chance for the alternate of principles and present wisdom among engaging examine experts from academic, commercial arid governmental associations and serve to stimulate destiny examine task. the current world-wide power scenario makes it hugely fascinating to lessen the strength required to maneuver street cars in the course of the surroundings. an important volume of the entire strength ate up 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 flooring transportation strength specifications. even though aerodynamic improvement paintings on highway vehides has been played for a few years, it has no longer been extensively said or followed by means of a lot easy research.
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Additional info for Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles
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.
DIN 70030 (1968), Ermittlung des Kraftstoffverbrauch von Kraftfahrzeugen, Beuth Vertrieb, Koeln. DISCUSSION R. T. Jones (NASA-Ames Research Center) I'm going to make a comment which I think may add some insight to a conclusion ahout the relation of induced drag to lift that I helieve the speaker has already drawn. The thrust of my comment is that I think there is no essential relation hetween lift and induced drag for a ground vehicle, as there is for an airplane. For example, you can have a ground vehicle that develops lots of lift hut no drag.
Pairs of drag and lift coefficients produced by different add-on parts to a basic car. baseline vehicle, has essentially the same drag coefficient as configuration B with a rear spoiler. But for the latter, the lift is less than half the value of the former. Configurations C and D, the one with front-fender spoilers, the other with a front spoiler, have exactly the same drag coefficient, and again a big difference in lift is observed. Finally, if configuration Ais compared with D, it can be seen that car A has a lower drag but a higher lift than D.