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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
Том 23, 2019 Том 22, 2018 Том 21, 2017 Том 20, 2016 Том 19, 2015 Том 18, 2014 Том 17, 2013 Том 16, 2012 Том 15, 2011 Том 14, 2010 Том 13, 2009 Том 12, 2008 Том 11, 2007 Том 10, 2006 Том 9, 2005 Том 8, 2004 Том 7, 2003 Том 6, 2002 Том 5, 2001 Том 4, 2000 Том 3, 1999 Том 2, 1998 Том 1, 1997

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v5.i2.60
8 pages

MEASUREMENT OF THE DISSOCIATION DEGREE OF OXYGEN IN AIR PLASMA-ARC-JETS

A. Lebehot
Laboratoire d'Aerothermique du CNRS 1C Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France
V. Lago
Laboratoire d'Aerothermique du CNRS 1C Avenue de la Recherche Scientifique, 45071 Orleans Cedex 2, France
Michel A. Dudeck
ICARE Inst.-CNRS and University of Paris 6, 75252 Paris, France
J. Kurzyna
Instytut Podstawowych Problemow Techniki - PAN, Swietokrzyska 21,00-149 Warszawa, Polska
Z. Szymanski
Instytut Podstawowych Problemow Techniki, PAN Swietokrzyska 21, 00-049 Warszawa, Poland
Z. Peradzynski
Instytut Podstawowych Problemow Techniki - PAN, Swietokrzyska 21,00-149 Warszawa, Polska

Краткое описание

The dissociation degree of molecular oxygen in air is measured on the axis of a plasma arcjet thanks to the actinometry technique. For this purpose, a small amount of argon is introduced into the gas of interest, and two emission lines, one of atomic oxygen (777.3 nm) and one of argon (811.5 nm), are analyzed locally, together with the corresponding electron density and energy distribution. Then, provided that a number of assumptions are satisfied, the dissociation degree of oxygen is proportional to the ratio of the line intensities. It is found to decrease from 1 at the nozzle exit down to 0.3 at a distance of 10 cm and increase again where a shock wave is expected.