Erlangen 2018 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Atmospheric Pressure Plasmas II
P 9.4: Talk
Tuesday, March 6, 2018, 15:00–15:15, A 0.112
Numerical and experimental analysis of breakdown initiation in single-filament dielectric barrier discharges — •Markus M. Becker, Hans Höft, Manfred Kettlitz, and Detlef Loffhagen — INP Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald
During the last decade the analysis of single discharge filaments in dielectric barrier discharges (DBD) has proven to be a useful tool for the design and optimization of DBD. In the present contribution, a combined experimental and numerical modelling study of a single-filament DBD at atmospheric pressure (0.1 vol% O2 in N2) is presented with special focus on the streamer propagation phase. The DBD has a gap width of 1 mm and is driven by a 10 kV voltage pulse with a rise time of about 45 ns. The experimental diagnostics consists of an iCCD and a streak camera system (50 ps temporal and 2 µm spatial resolution) combined with fast electrical probes. The numerical investigations are based on a spatially two-dimensional axisymmetric fluid model using the local mean energy approximation for the determination of the electron transport coefficients as well as the excitation/ionization rate coefficients. Besides Poisson’s equation, balance equations for electrons, the most relevant heavy particle species and the surface charges accumulated on the dielectric surfaces are included. First numerical results are in fair agreement with electrical measurements and the experimental determination of the streamer propagation velocity by means of optical measurements. It is shown that the streamer properties, e.g. propagation velocity and electric field strength, of the DBD differ markedly from those of streamers in unbounded domains.