Investigation of nanosecond-pulsed dielectric barrier discharge actuators with powered electrodes of different exposures

Nanosecond-pulsed dielectric barrier discharge actuators with powered electrodes of different exposures were investigated numerically by using a newly proposed plasma kinetic model.The governing equations include the coupled continuity plasma discharge equation,drift-diffusion equation,electron energy equation,Poisson's equation,and the Navier-Stokes equations.Powered electrodes of three different exposures were simulated to understand the effect of surface exposure on plasma discharge and surrounding flow field.Our study showed that the fully exposed powered electrode resulted in earlier reduced electric field breakdown and more intensive discharge characteristics than partially exposed and rounded-exposed ones.Our study also showed that the reduced electric field and heat release concentrated near the right upper tip of the powered electrode.The fully exposed electrode also led to stronger shock wave,higher heating temperature,and larger heated area.