Manipulation of coherent structures in the near wake of a square-mesh grid with plasma DBD actuators
Résumé
This paper conducts a thorough examination of the near wake of a square-mesh grid equipped with a Dielectric Barrier Discharge, using high-speed 2D Particle Image Velocimetry at 44.4 kHz. The study surveys the near field at ReM = 4×10^(3) to assess the wake interaction parameters. Subsequently, it investigates the dynamics of coherent structures in the shear layers to establish an efficient control strategy. By imparting multifrequency excitation, the discharge demonstrates its ability to reduce the wake interaction length scale by 10%. This achievement is attributed to the discharge's control over coherent structures and is attained with an impressively low control cost of just 1.2 Watt.