WAKE FLOWS FORCED BY THREE-ELECTRODE PLASMA PULSED ACTUATORS

D'ADAMO, JUAN; LEONARDO, LEANDRO; F CASTRO; R SOSA; DURIEZ, THOMAS; ARTANA, G.

São José dos Campos

Workshop; 10th ABCM Spring School on Transition and Turbulence; 2016

Associação Brasileira de Engenharia e Ciências Mecânicas

We study the actuated flow around a cylinder at Re=5500, for which shear layer transition leads to a turbulentwake, with the goal to produce a drag reduction. We considered a three-electrode plasma discharge (TED) actuator and wescrutinized the incidence of two forcing parameters (frequency and amplitude). Particle Image Velocimetry measurementsenabled to obtain detailed information and therefore facilitate the comparison of the performance of TED actuator withthe canonical dielectric discharge barrier actuator. For the Reynolds number considered, excitation with a TED actuatorachieved reductions that attained values as high as 40%. The analysis of vorticity fields complemented with a clusteringtechnique allowed us to gain a physical insight of mechanisms involved particularly when excitation are produced at theresonance frequencies of the wake flow. It comes out from our analysis that spanwise uniform excitation which promotesymmetrical vorticity patterns favor drag reductions.