Control of a decelerating boundary layer. Part 2: Optimization of slotted jets vortex generators

Gilles Godard (1) , Jean-Marc Foucaut (2) , Michel Stanislas (2)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie
2 LML - Laboratoire de Mécanique de Lille - FRE 3723

In the first part of this contribution [G. Godard, M. Stanislas, Control of a decelerating boundary layer. Part 1: Optimization of passive vortex generators, Aerospace Sci. Technol. 10 (3) (2006) 181–191], an optimization of passive vortex generators was performed in an adverse pressure gradient boundary layer. The model used was a bump in a boundary layer wind tunnel, which mimics the adverse pressure gradient on the suction side of an airfoil at the verge of separation. The present contribution describes the next step of the study: a test campaign was performed in the same facility to optimize slotted jets devices with both continuous and pulsed blowing. The optimization was done using hot film shear stress probes. The results show quantitatively the improvement brought by the slotted jets devices in terms of skin friction increase. They also show that the tested devices are less effective than equivalent passive devices.

Mots clés: Flow control; APG boundary layer; Jets; Vortex generators

Gilles Godard, Jean-Marc Foucaut, Michel Stanislas. Control of a decelerating boundary layer. Part 2: Optimization of slotted jets vortex generators. Aerospace Science and Technology, 2006, 10, pp.394-400. ⟨10.1016/j.ast.2005.11.006⟩. ⟨hal-00087544⟩