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Optical and electrical analyses of DC positive corona discharge in N2/O2/CO2 gas mixtures

Published online by Cambridge University Press:  09 April 2008

N. Merbahi ,
A. Abahazem ,
D. Dubois ,
O. Eichwald  and
M. Yousfi
N. Merbahi*
Affiliation:
Université de Toulouse, Laplace, CNRS, INPT, UPS, 118 route de Narbonne, Bât. 3R2, 31062 Toulouse Cedex 9, France
A. Abahazem
Affiliation:
Université de Toulouse, Laplace, CNRS, INPT, UPS, 118 route de Narbonne, Bât. 3R2, 31062 Toulouse Cedex 9, France
D. Dubois
Affiliation:
Université de Toulouse, Laplace, CNRS, INPT, UPS, 118 route de Narbonne, Bât. 3R2, 31062 Toulouse Cedex 9, France
O. Eichwald
Affiliation:
Université de Toulouse, Laplace, CNRS, INPT, UPS, 118 route de Narbonne, Bât. 3R2, 31062 Toulouse Cedex 9, France
M. Yousfi
Affiliation:
Université de Toulouse, Laplace, CNRS, INPT, UPS, 118 route de Narbonne, Bât. 3R2, 31062 Toulouse Cedex 9, France
*
nofel.merbahi@laplace.univ-tlse.fr
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Abstract

This paper presents an experimental analysis of the electrical and optical behaviour of positive point-plane corona discharges. The measurements of the instantaneous corona current and the current-voltage characteristics are used with the imagery analyses (CCD and streak camera) to determine the streamer properties such as the streamer morphology and velocity with the primary and secondary streamer developments. These analyses are performed first in synthetic air as a function of operating parameters such the applied voltage. Then the effect of gas mixtures (several proportions of N2, O2 with or without CO2) is analysed. When the gas concentration is varied the discharge morphology, the shape and amplitude of the corona current are significantly affected due to the variation of the gas electronegativity following its composition and concentration.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 42 , Issue 1: 16th International Colloquium on Plasma Processes (CIP 2007) , April 2008 , pp. 55 - 61
Copyright
© EDP Sciences, 2008

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