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Etude électrique de la physique d'une décharge de Townsend à la pression atmosphérique et de son interaction avec un générateur : Modèle et Expérience

Abstract : Recent works showed that the Atmospheric Pressure Townsend Discharge (APTD) is compatible with online surface treatment process like polymers surface activation or thin films deposit. Nevertheless, the conditions to get this dielectric barrier discharge are still too limited for the development of an industrial process: the dissipated power being too low the treatment time is too long for industrial applications. The aim of this work is to improve the APTD physics understanding in order to determine the origin of the different observed destabilizations which limit the power transmitted to the discharge. The approach consists in a fine study of the coupling between the power supply and the discharge, by means of an electrical model based on experimental observations of both the APTD and the power supply. The electrical model of the APTD allows to have a macroscopic view of the discharge. We have highlighted the importance of the secondary emission variation during the discharge, as well as the memory effect from one discharge to the following one and of the gas temperature increase, determined by a resistance thermometer and rotational temperature measurements. It appears that the increase of the gas temperature is always proportional to the mean power, even during the transients. Thus, the developed model describes the electrical behavior of the discharge on its entire domain. The coupling of this model with the power supply model shows that a reason of the APTD destabilization come from oscillations due to the parasitic elements of the power supply. This understanding allowed to find two solutions to increase the discharge power. The first consists in decreasing the ratio between the gas capacity and the solid dielectric capacity which avoids the transition to the arc, in order to avoid the appearance of the oscillations. The second, studied only in simulation, is based on the use of a square-wave current inverter source in order to maintain a constant current during the discharge and to increase the duration of the discharge ignition.
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https://tel.archives-ouvertes.fr/tel-00601053
Contributor : Nicolas Naudé <>
Submitted on : Thursday, June 16, 2011 - 3:21:25 PM
Last modification on : Friday, January 10, 2020 - 9:08:17 PM
Long-term archiving on: : Friday, November 9, 2012 - 3:16:21 PM

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  • HAL Id : tel-00601053, version 1

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Nicolas Naudé. Etude électrique de la physique d'une décharge de Townsend à la pression atmosphérique et de son interaction avec un générateur : Modèle et Expérience. Sciences de l'ingénieur [physics]. Université Paul Sabatier - Toulouse III, 2005. Français. ⟨tel-00601053⟩

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