The relationship between DBD performance in ambient and flowing air

Dielectric barrier discharges (DBDs) have been shown to reduce flow separation on airfoils in flowing air [1], as well as impart momentum into ambient air [2]. The relationship between DBD performance in both regimes is not well understood. We previously investigated a novel DBD discharge regime in ambient air first discovered by Hoskinson et. al.[3], where for cylindrical exposed electrodes, as the electrode diameter was reduced below 50 $\mu$m, the force divided by power dissipated in ambient air increased exponentially. We now investigate the ability of these DBDs to reduce flow separation in flowing air of Re $\sim $ 5E5 and how it relates to their discharge characteristics in ambient air. The results are presented here for the first time. \\[4pt] [1] T. C. Corke, C. Lon Enloe, and S. P. Wilkinson, Annu. Rev. Fluid Mech, 42, 505-529 (2010).\\[0pt] [2] M. Forte et. al. Exp. Fluids, 43, 917-928 (2007).\\[0pt] [3] A. R. Hoskinson, N. Hershkowitz, and D. E. Ashpis, J. Phys. D: Appl. Phys., 41, 245209 (2008).