Modélisation et simulation d'une décharge à barrière diélectriques dans un Mélange gazeux à la pression atmosphérique

Abstract

The subject of this thesis is in the field of electric discharge at atmospheric pressure, especially dielectric barrier discharges in a gas mixture, and also the characteristics of this type of discharge. The mixture chosen is oxygen and nitrogen; these two gases represent approximately 99% of the air. The discharge in this mixture allow to produce ozone, where the Ozone is a powerful disinfecting and oxidizing agent, and for this reason, it is used in a wide range of applications such as treatment of municipal and wastewater, food processing, fire restoration, restoration of buildings and other objects after floods, etc. When ozone exposed to organic compounds or bacteria, the extra atom of oxygen destroys the contaminant by oxidation. Thus, ozone will neutralize virtually all organic odors, specifically those containing carbons as their base element. This will include all bacteria as well as smoke, decay and cooking odors. To facilitate the understanding of this work research work, we devised the manuscript in five chapters; The first chapter gave the description of the context which is accompanied by information on the main mechanisms of discharges in a gas, as well as a summary of current knowledge on the generation of ozone by non-thermal plasmas. In the second chapter we in details the determination and validation of the basic data, which will be inserted in the model for the dielectric barrier discharge simulation. Third and fourth chapters are devoted to the development of the dielectric barrier discharge models in nitrogen and oxygen respectively, and also the simulation results. The results of this thesis are shown in the form of curves. These results are clear and satisfactory to justify the validity and reliability of the dielectric barrier discharge model used in this thesis. This method makes it possible to obtain a large amount of operating information and parametric study. Finally, the model proposed in the last chapter is the main objective of this thesis, which is a modeling of dielectric barrier discharge in gas mixture at atmospheric pressure (dry air 20% oxygen and 80% nitrogen) with a parametric study.