Drag reduction method

A drag reduction apparatus for reducing the aerodynamic drag on a bluff body 200 having a blunt trailing edge, for example a road vehicle such as a lorry or a city car, comprises one or more control elements 120 coupleable to and moveable relative to bluff body 200, so that movement of control eleme...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Rowan David Brackston, Jonathan Finley Morrison, Andrew Wynn, Juan Marcos Garcia de la Cruz Lopez, Georgios Rigas
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOWOF GASES OR LIQUIDS FLUID-PRESSURE ACTUATORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS LIGHTING MECHANICAL ENGINEERING MOTOR VEHICLES PERFORMING OPERATIONS TRAILERS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A drag reduction apparatus for reducing the aerodynamic drag on a bluff body 200 having a blunt trailing edge, for example a road vehicle such as a lorry or a city car, comprises one or more control elements 120 coupleable to and moveable relative to bluff body 200, so that movement of control elements 120 controls fluid flow at the wake of bluff body 200 and reduces drag caused by fluid flow instabilities and environmental asymmetries. Preferably, control elements 120 are control surfaces provided with actuators 130 so that the control surfaces oscillate relative to bluff body 200. The oscillation may involve a control signal having a frequency component and a component controlling the mean position of the control surfaces, and may be programmatically controllable using a processor. Pressure sensors may be provided to measure pressure in the wake of bluff body 200. The drag reduction apparatus may be compact and, if provided on a vehicle, reduce fuel consumption.