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高温材料处理:国际期刊
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN 打印: 1093-3611
ISSN 在线: 1940-4360

高温材料处理:国际期刊

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

ABSTRACT

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.