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MODIFICATION OF GLOBAL PROPERTIES OF A MIXING LAYER BY OPEN/CLOSED LOOP ACTUATION

Vladimir Parezanovic
Departement Fluides, Thermique, Combustion Institut PPRIME, CNRS UPR 3346 CEAT, 43 rue de I'Aerodrome, F-86036 Poitiers, FRANCE

Jean-Charles Laurentie
Departement Fluides, Thermique, Combustion Institut PPRIME, CNRS UPR 3346 CEAT, 43 rue de I'Aerodrome, F-86036 Poitiers, FRANCE

Carine Fourment
Departement Fluides, Thermique, Combustion Institut PPRIME, CNRS UPR 3346 CEAT, 43 rue de I'Aerodrome, F-86036 Poitiers, FRANCE

Laurent Cordier
Department Fluides, Thermique, Combustion, CEAT Institut PPRIME, CNRS-Universite de Poitiers-ENSMA, UPR 3346 43 rue de I'Aerodrome, F-86036 Poitiers CEDEX, France

Bernd R. Noack
Berlin Institute of Technology MB1 Strasse des 17. Juni 135, D-10623 Berlin, Germany; Departement Fluides, Thermique, Combustion Institut PPRIME, CNRS UPR 3346 CEAT, 43 rue de I'Aerodrome, F-86036 Poitiers, FRANCE

Tamir Shaqarin
Univ Lille Nord de France Laboratoire de Mecanique de Lille (UMR 8107) Boulevard Paul Langevin, 59655 Villeneuve d'Ascq Cedex, France; Mechanical Engineering Department, College of Engineering Tafila Technical University JORDAN

Résumé

Open- and closed-loop control of a turbulent mixing layer is experimentally performed in a dedicated large scale, low speed wind-tunnel facility. The flow is manipulated by fluidic micro-jet actuators integrated in the trailing edge of the splitter plate. Sensing is performed using a rake of hot-wire probes downstream of the splitter plate in the mixing layer. The control goal is the manipulation of the spreading rate and of the virtual origin of the mixing layer. The underlying physical mechanisms employ a wide range of frequencies. The calculated Reynolds number based on momentum thickness of the boundary layer at the trailing edge is around Re=500-2000 depending on the mixing layer configuration. Control authority is presented using smoke visualization, Particle Image Velocimetry (PIV) and hot-wire measurements of local velocity.