Experimental and numerical analysis of current instabilites in barrier discharge

The investigation of dielectric barrier discharges (DBD) depending on the medium parameters and conditions has a great significance in the perspective of the technological processes based on discharge phenomena and high voltage technique in which the gases are widely used as an insulation material.In various gas mediums, in DBD cell models including Metal-Gas-Dielectric-Metal (MGDM) with single barrier and Metal-Dielectric-Gas-Dielectric-Metal (MDGDM) with double barriers, the experimental investigation and numerical modeling of barrier discharges provide a considerable advantage for the analysis of the current instabilities resulting from surface charging mechanism on dielectric layer.In this study, a new model based on conductivity mechanism for MGDM and MDGDM DBD cells has been developed under the conditions of pd<(pd)cr and pd>(pd)cr, (p-pressure, d-the distance between electrodes) in air and nitrogen medium by considering Townsend approach, and theoretical analysis and numerical simulation of current oscillations occurring in DBD cell, have been performed. By considering the Voltage-Current and Voltage-Charge curves measured experimentally, the determining of basic parameters of the model has been explained and the consistency between obtained experimental results and the results of proposed numerical method has been investigated comparatively.