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CHARACTERIZATION OF A SEPARATED TURBULENT BOUNDARY LAYER FOR FLOW CONTROL PURPOSE.

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

The flow over a two dimensional ramp has been characterized. First, some configurations of the ramp were characterized rapidly with only wall pressure measurements and wool tufts visualisations. The aim of this first work was to check the spanwise homogeneity and to find the angle α and β of the ramp that give a ramp configuration with an adverse pressure gradient on the 2 m flat plate and a separation on the flap. It was found that for α = −2°, the separation occur on the flap for β under −19°. The configuration with α = −2° and β = −22° was then selected and characterized more carefully with hot-wire profiles. On this configuration, the boundary layer over the ramp is around 20 cm and the Reynolds number based on the momentum thickness (Reθ) is around 11 000. The boundary layer under study develops with a mild adverse pressure gradient with a Clauser pressure parameter between 0.2 and 1.4. At the end of the 2 m flat plate of the ramp, there is a separation on the flap which is more or less two dimensional on 70 % of the span. This flow mimics the suction side of a wing and is then adapted to do parametric studies of flow control.