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Tandem airfoil vortex interaction in deep-stall

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Deep-stall is a flow regime which may occur in tandem airfoil configurations at high angle of attack. It results from a detached flow on the downstream airfoil and a drop of the lift, rendering the elevators ineffective for a potential recovery. The present numerical simulation describes vortices interaction with the downstream airfoil and its effect on change in lift for a given tandem airfoil configuration.

Author(s):

Laurent Hétru    
Centre de Recherche de l'Armée de l'air (CReA)
France

Sébastien Kolb    
Centre de Recherche de l'Armée de l'air (CReA)
France

Olivier Montagnier    
Centre de Recherche de l'Armée de l'air (CReA)
France

Thierry M. Faure    
Centre de Recherche de l'Armée de l'air (CReA)
France