Significant improvements have been made in the last decades to reduce the drag of commercial vehicles, especially heavy trucks. Preliminary experiments were carried out to investigate possible benefits of using a relatively new type of fluidic actuators (Raman & Raghu; Cavity Resonance Suppression Using Miniature Fluidic Oscillators. AAIA Journal ,Vol. 42, (2004) No. 11) in combination with attached aft bodies to reduce the drag on a standard semi-trailer truck. The actuators generate oscillating jets that cause the formation of streamwise vortices that enhance the entrainment of the shear layer significantly. Taking into account the potential feasibility of any add-ons to a trailer, seven different bodies with simple geometries were chosen for this investigation. The drag of a semi-trailer truck model was reduced by added aft bodies by up to 5.5% depending on the shape and size of the added body and the Re. When active flow control was added, its contribution to this reduction was minor. The maximum reduction obtained by active flow control was approximately 1% for the short flaps that were inclined at 20 degree to the sidewalls and the top of the trailer. In general, actuators providing streamwise vortices in the wake of a truck by oscillatory jets seem to be promising for reducing its drag, especially when the simplicity and robustness of the investigated actuators is considered.
Preliminary Experiments Applying Active Flow Control to a 1/24th Scale Model of a Semi-Trailer Truck
Erste Versuche zur aktiven Beeinflussung der Umströmung eines Sattelschlepper-Modells im Maßstab 1:24
2009
9 Seiten, 7 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
aktive Steuerung , Aktuator , Fahrzeugaerodynamik , Funktionsprinzip , Heckspoiler , Karosserieluftführung , Klappe , Luftwiderstand , Luftwiderstandsbeiwert , oszillierende Strömung , Sattelschlepper , Scherströmung , Strahlausfluss , Strömungsregelung , Versuchsmodell , Widerstandsverminderung , Wirbelbildung
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