Interaction tourbillon / couche limite
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L'objectif de cette étude est d'analyser expérimentalement l'interaction entre un tourbillon longitudinal isolé et une couche limite se développant sur un profil portant bidimensionnel de type NACA0015. Les mesures ont été réalisées par vélocimètrie laser pour les champs de vitesse et par balance en ce qui concerne les efforts. Cette configuration peut être retrouvée dans les applications de contrôle d'écoulement ou en hydrodynamique navale. L'originalité résidant dans le fait que le vortex est généré hors couche limite. Les résultats ont montrés que la présence du tourbillon inhibe le phénomène d'hystérésis au décrochage statique, ceci étant associé à une modification notable des états de couche limite tant en valeur moyenne que fluctuante. En effet, la présence du tourbillon modifie le gradient de pression et retarde le décollement en ré-accélérant le fluide à la paroi. Pour les incidences plus élevées, on observe un ré-attachement de la couche limite. La dynamique de cet écoulement est analysée par décomposition orthogonale en modes propres (POD) dans le but de mieux appréhender l'alignement spatial tourbillonnaire dans le sillage des corps mis à grande incidence et contrôlé.
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