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P: Fachverband Plasmaphysik
P 11: Codes and Modelling
P 11.1: Talk
Wednesday, March 30, 2022, 14:00–14:15, P-H11
Modelling of streamer inception in pulsed-driven dielectric barrier discharges at atmospheric pressure — •Aleksandar P. Jovanović, Hans Höft, Detlef Loffhagen, and Markus M. Becker — Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
A pulsed-driven dielectric barrier discharge (DBD) in a symmetric single-filament configuration with hemispherical electrodes is the object of interest of the analysis. The Townsend pre-phase and streamer propagation in Ar and N2 with an admixture of 0.1 vol.% of O2 have been investigated by a time-dependent, spatially two-dimensional fluid model. It consists of a set of balance equations for the particle number densities, the electron energy density, and the surface charge density, coupled with Poisson’s equation for the determination of electric potential and field. The evolution of the spatial profiles of the electron number density and the electric field showed earlier streamer inception in Ar in comparison to the N2-O2 mixture, while qualitatively similar behaviour of the discharge during the streamer propagation was observed in both gases. The streamer propagation and consequently the current rise was slower in Ar (reaching a maximum streamer velocity of 0.43 mm/ns) compared to N2-O2 (1.23 mm/ns). An analysis of the electron particle and energy budget was performed to find out how the different gain and loss processes in these two gases affect the pre-phase and the streamer propagation.
Funded by the Deutsche Forschungsgemeinschaft (DFG) – project numbers 407462159 and 408777255.