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MEAN TURBULENT FLOW IN THE WAKE OF A PERFORATED PLATE EQUIPPED WITH NON-THERMAL PLASMA

Nicolas Benard
Department of Fluids, Thermique et Combustion Institut PPRIME (CNRS UPR3346, Université de Poitiers, ISAE-ENSMA) Bd Marie & Pierre Curie, BP 30279, 86962 Futuroscope, France

Pierre Audier
Institut PPRIME CNRS - Université de Poitiers – ISAE/ENSMA SP2MI Téléport 2 Bd Marie et Pierre Curie BP 30179, Futuroscope, 86962 Poitiers, France

Romain Bellanger
Institut PPRIME CNRS - University of Poitiers - ISAE-ENSMA Bld Marie & Pierre Curie, 86962 Futuroscope France

Eric Moreau
LASEP, Faculte des Sciences, Université d'Orléans, rue Gaston Berger BP 4043, 18028 Bourges Cedex; Department of Fluids, Thermique et Combustion Institut PPRIME (CNRS UPR3346, Universite de Poitiers, ISAE-ENSMA) Bd Marie & Pierre Curie

Resumo

The present experimental contribution interests in the flow field developing downstream of a plate perforated by 121 holes with 1.8-mm inner diameter. The original aspects of this research is that the holes are all surrounded by plasma discharges that can actively impose periodic perturbations to the flow developing in the wake of the plate. In particular, it is shown by flow visualizations and particle image velocimetry that the plasma discharges can significantly affect the turbulent kinetic energy. It is observed that the multi-jet flow quickly form a single jet whose the turbulent production can be significantly increase by operating the plasma discharge in a mode imposing perturbations at a Strouhal number equal to 0.3. This type of forcing promotes an earlier production of turbulence but it also imposes the formation of coherent flow structures with a shedding frequency matching with the one imposed by the actuator.