Towards a validation on a slip wall velocity model for DBD plasma actuators.

J. D'ADAMO; A GRONSKIS; R SOSA; M BARCELÓ; G ARTANA

Colonia

Congreso; XI Reunión sobre Recientes Avances en Física de Fluidos y sus Aplicaciones; 2010

Instituto de Física, Facultad de Ciencias, UDELAR

Abstract. Electrohydrodynamic (EHD) actuators are devices that produce a weakly ion-ized gas and add momentum to air ow by the collisions of charged particles with theneutral species. Dielectric barrier devices (DBD) consists in two periodically excitedelectrodes, one exposed to the air while the other is encapsulated by a dielectric mate-rial. The electrical frequencies are typically in the range of some kHz and its voltage,some kV. The ow around an object provided with such electrodes can be modied thus.The coupled electrical and hydrodynamical problem that arises from this congurationis still open. An empiric coupling model was proposed in recent works, where there areimposed conditions on ows that come out from experiments: the actuation is modelledas a slip-wall condition. In this context, numerical models were performed in order tosimulate the external ow around a cylinder at low Reynolds(Re) numbers modied byEHD actuation.The present work addresses the validation of these simulations, by means of particle im-age velocimetry (PIV) experiments. For Re= 180, the ow frequencies are in the range ofHz so we modify the ow with an actuation that can be considered as stationary. Hencethe controlling parameter is the actuation amplitude. The position and the number ofactuators disposed on the cylinder surface were determined in an optimization problemsolved with simulations.We studied particularly the drag and uctuating energy optimization of the controlledow to fulll the comparison with the previous simulation results.