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The Flow Structure Produced by Pulsed-jet Vortex Generators in a Turbulent Boundary Layer in an Adverse Pressure Gradient

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Kostas Jim; Foucaut Jean-Marc; Stanislas Michel
journal (abréviation) Flow, Turbulence and Combustion (Flow, Turbulence and Combustion)
volume (numéro) 78 (3-4)
  
pages 331 – 363
résumé The effect of pulsed jet vortex generators on the structure of an adverse pressure gradient turbulent boundary layer flow was investigated. Two geometrically optimised vortex generator configurations were used, co-rotating and counter-rotating. The duty cycle and pulse frequency were both varied and measurements of the skin friction (using hot films) and flow structure (using stereo PIV) were performed downstream of the actuators. The augmentation of the mean wall shear stress was found to be dependent on the net mass flow injected by the actuators. A quasi steady flow structure was found to develop far downstream of the injection location for the highest pulse frequency tested. The actuator near field flow structure was observed to respond very quickly to variations in the jet exit velocity.
mots clés pulsed jets - vortex generators - boundary layers - flow structure
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