Modeling of DBD plasma actuators for aerodynamic flow control: basic aspects.

摘要

A numerical investigation was conducted on a DBD discharge plasma actuator powered by a DC/AC supply. A simplified plasma kinetic model, for pure nitrogen, at atmopheric pressure was considered. It consisted of continuity equations for charged particles in drift diffusion approximation, as well as Poisson equation for self-consistent electric potential, assuming negligible effects of induced magnetic fields. Different simulations for a DBD ac- tuator powered by DC constant voltage and AC (repetitive Gaussian pulses) voltage were carried out. The most significative results are shown. In the build-up of different discharge regimes (from corona to streamer-like regime), the role of the ion-induced secondary elec- tron emission from dielectric walls and the influence of the background ionization in the bulk are analyzed. In the end, a short discussion on limits and possible improvements of the proposed model is presented.