Discharge propagation on a dielectric surface in a single-filament arrangement
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THE EUROPEAN PHYSICAL JOURNAL D
Regular Article
Discharge propagation on a dielectric surface in a single-filament arrangement Manfred Kettlitz1,a , Rouven Klink2 , Hans H¨ oft1 , and Ronny Brandenburg1,3 1 2 3
Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany Formerly at University of Greifswald, Institute of Physics, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany University of Rostock, Institute of Physics, Albert-Einstein-Str. 23–24, 18059 Rostock, Germany Received 14 February 2020 / Received in final form 31 March 2020 Published online 9 June 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. Discharge development and streamer propagation on a dielectric surface were investigated in nitrogen-oxygen gas mixtures at atmospheric pressure. A coaxial pin-to-pin arrangement was used to generate single surface discharges driven by positive unipolar square wave high voltages of between 7 and 9 kV at 4.3 kHz. The development of surface discharges was recorded by ICCD and streak cameras. The discharges developed on the surface using pin electrodes attached directly to the dielectric plate. The accumulation over several discharge events showed a propagation front evolving from the electrode tip, while images of single discharges showed a non-uniform and branched structure of discharge channels. The electrode polarity influenced the discharge expansion and propagation velocity. Positive polarity of the metallic electrode (rising slope of HV pulses) led to a cathode-directed streamer with higher propagation velocities (5 × 105 m/s) than for negative polarity (relative to surface charges; falling slope). The increase in the O2 content in N2 from 0.1 to 20 vol% resulted in a decrease in discharge duration and an increase in streamer velocities.
1 Introduction Dielectric barrier discharges (DBDs) create a transient non-thermal plasma [1,2] in the gas volume and on the electrode surface and are often used for plasma chemistry. Surface dielectric barrier discharges (SDBDs) are frequently used for e.g. gas flow control or surface cleaning and modification [3,4] and recently for antibacterial treatment of fruits [5]. Sato et al. [6] used surface discharges for exhaust cleaning of automobile gases in an especially designed honeycomb reactor. Several studies deal with active flow control by actuators on the basis of surface nonthermal plasmas, such as [3,7–10] which used different discharge configurations to generate a flow of several m/s in the boundary layer along the surface, mainly focussing on strip-on-plane or pin-on-plane geometries [7,11]. The influences of sinusoidal [8,12,13] and pulsed [11,14–18] voltages of SDBDs on the flow have been analysed experimentally, as well as by modelling [19–21]. On the other hand, partial discharges on dielectric surfaces are important in high-voltage installations and systems due to the fact that they may lead to short circuiting and thus damage to devices. An
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