The concept of moving surface boundary-layer control has proved quite successful in increasing lift and delaying stall of slender bodies like airfoil sections. This paper assesses effectiveness of the concept in reducing drag of bluff bodies such as a two dimensional flat plate at large angles of attack, rectangular prisms and three dimensional models of trucks through an extensive windtunnel test-program. Results suggest that injection of momentum through moving surfaces, achieved here by introduction of bearing mounted, motor driven, hollow cylinders, can significantly delay separation of the boundary-layer and reduce the pressure drag. A flow visualization study, conducted in a closed-circuit water tunnel using slit lighting and polyvinylchloride tracer particles, complements the wind tunnel tests. It shows, rather dramatically, effectiveness of the moving surface boundary-layer control.
An approach to design of the next generation of fuel efficient trucks through aerodynamic drag reduction
Ein Lösungsweg zur Auslegung der nächsten Generation von Lastkraftwagen mit hoher Ausbeute des Kraftstoffs durch die Verminderung des aerodynamischen Widerstandes
1991
18 Seiten, 16 Bilder, 1 Tabelle, 21 Quellen
Conference paper
English
Lastkraftwagen , technische Entwicklung , Prozessoptimierung , Kraftstoffverbrauch , Leistungssteigerung , Kraftstoffeinsparung , Leistungsbewertung , Fahrzeugaerodynamik , Strömungswiderstand , Widerstandsbeiwert , Fahrzeugstilistik , Simulationsmodell , Windkanal , Prüfstand , Grenzschichtstabilität , konstruktive Gestaltung
Automotive engineering | 1991
|Research in aerodynamic drag reduction of trucks
Automotive engineering | 1975
|Drag Reduction an Trucks by Aerodynamic Parts and Covers
Automotive engineering | 1982
|Aerodynamic drag reduction system for trucks, cargo trailers and train boxcars
European Patent Office | 2019
|