Atmospheric Pressure Air and Nitrogen DC Glow Discharges with Thermionic Cathodes
Machala Z., Laux C.O., Kruger C.H. and Candler G.V.
42nd Aerospace Sciences Meeting and Exhibit, paper AIAA 2004-355, Reno, NV, USA, 5-8 January (2004)
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Abstract: Atmospheric air and nitrogen glow discharges have been studied in our laboratory over the past few years with an overall goal to produce nonequilibrium plasmas with high electron number densities (at least 10e12 cm-3) and relatively low gas temperatures (about 2000 K), as well as to meet the challenges of low power requirements and large plasma volumes. We now introduce a novel approach to produce highly ionized atmospheric pressure air and nitrogen plasmas in DC glow discharges. We employ thermionic cathodes (LaCrO3, LaB6 and Mo) and place the discharges in tubes with swirl gas flow injection. As a result, an increase of the electron density by 1-2 orders of magnitude was achieved (10e13-10e14 cm-3), together with higher current densities and lower electric fields. The swirl flow confines the discharge, increasing its current and electron densities, enhancing its stability, and enabling it to extend to as long as 10 cm. A new falling region in the air discharge E-j and E/N-j characteristics was revealed.Computational analysis helps to understand the stabilizing effect of the swirl flow. DC discharges with thermionic cathodes combined with the swirl flow represent a promising way for producing scaled-up highly ionized atmospheric air or nitrogen plasmas.
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Citations: | 1.) | E. Cejas, B. Mancinelli, L. Prevosto: Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High-Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms, Plasma 3 (1) 12-26 (2020), WoS
(2020)
------------- | | 2.) | Cejas E., Mancinelli B.R., Prevosto L.: Glow discharge in a high-velocity air flow: the role of the associative ionization reactions involving excited atoms. Materials, 12 (16) 2524 (2019), WoS, SCOPUS
(2019)
------------- | | 3.) | L. Leštinská: Microwave plasma optical emission spectroscopy combined with atmospheric pressure DC discharges, PhD. thesis, Comenius University Bratislava, 2012
(2012)
------------- | | 4.) | A. Risacher: Etude de l’interaction d’un arc électrique de faible puissance avec une onde électromagnétique dans un écoulement d‘air a pression atmosphérique, PhD. thesis, UNIVERSITE PARIS XI Orsay, France, 2008, cit. [39]
(2008)
------------- | | 5.) | D. Pai: Etude des plasmas générés par impulsions électriques nanosecondes répétitives dans l'air préchauffé a pression atmosphérique, PhD thesis, Paris: École Centrale, 2008. p. 47
(2008)
------------- | | 6.) | A.Risacher, S. Larigaldie, G.Bobillot, J.-P.Marcellin, L.Picard: Active Stabilization of Low-Current Arc Discharges in Atmospheric Pressure Air, Plasma Sorces Sci. Technol. 16 (2007), 200-209
(2007)
------------- | | 7.) | A. Risacher, S. Larigaldie, G.Bobillot, J.-P.Marcellin, L.Picard: Modeling of a Steady Low-Current Arc Discharge in Air at Atmospheric Pressure, 13th International Congress on Plasma Physics, Kiev, 22-26 May 2006, cit. [4]
(2006)
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