SMuK 2021 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster II

P 17.8: Poster

Freitag, 3. September 2021, 14:00–16:00, P

Control and monitoring of spatial discharge distribution in a barrier corona discharge at elevated pressures — •Hamed Mahdikia, Michael Schmidt, Volker Brüser, and Ronny Brandenburg — Leibniz Institute for Plasma Science and Technology, 17489, Greifswald, Germany

A barrier corona discharge in CO2 with admixture of Argon is studied. The aim is to investigate the operation at elevated pressures up to 5 bar for industrial scale CO2 conversion. Therefore, the coaxial asymmetric dielectric barrier discharge contains an inner brush electrode to intensify the electric field strength and to minimize the amplitude of the applied high voltage driving the discharge. Charge-voltage plots are used to characterize the discharge. Depending on the conditions (sinusoidal voltage amplitude, gas composition), full or partial coverage of the electrodes is obtained. This so-called partial discharging is monitored by the variation of the effective dielectric capacitance. It increases exponentially for a mixture of Ar and CO2 (1:4) at 1 bar and reaches its maximum (i.e. fully electrode covering discharge) as the amplitude of the applied high voltage exceeds 8 kV. It decreases linearly with the increasing the pressure. The cell capacitance remains constant under variation of gas and pressure. The higher the pressure the higher the sustaining voltage and the lower the surface coverage fraction of the plasma. This may be due to the fewer and weaker micro discharges due to the lower ionization rate at higher pressures.