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FLOW CONTROL OVER A RAMP USING ACTIVE VORTEX GENERATORS

Christophe Cuvier
Univ Lille Nord de France F-59000 Lille, EC Lille, Laboratoire de Mecanique de Lille (UMR 8107) Boulevard Paul Langevin, 59655 Villeneuve d'Ascq Cedex, France

Caroline Braud
Univ Lille Nord de France, CNRS, Laboratoire de Mecanique de Lille (UMR 8107) Boulevard Paul Langevin, 59655 Villeneuve d'Ascq Cedex, France

Jean-Marc Foucaut
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Michel Stanislas
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Аннотация

A parametric study of separation control using continuous jets vortex generators was conducted on a two-dimensional ramp with a mild adverse pressure gradient on a 2 m flat plate and a flow separation on a flap. Two jets diameters were investigated : 6 and 12 mm. For both diameters, co and counter-rotating arrangements were analysed. The control efficiency was quantified by wool-tufts visualisations and by four friction probes placed on the flap. It was found that a skewness of the output voltage of a friction probe greater than -0.4 is characteristic of flow reattachment. Different spacing between jets, different pitch angles, different distances of the jets to the separation line and different VR were tested. The best configuration obtained is a counter-rotating one, with Φ/δ = 0.03, λ/Φ = 27.3, L/Φ = 15 and α = 135°.