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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2004, Volume8

169 pages

DOI: 10.1615/HighTempMatProc.v8.i4

Issue price - $144.00

ON THE KINETICS OF A RELAXING HIGH TEMPERATURE ATMOSPHERIC PRESSURE NITROGEN PLASMA

A. A. Belevtsev
Associated Institute for High Temperatures, Russian Academy of Science, Izhorskaya 13/19, Moscow, 125412 Russia

V. F. Chinnov
Associated Institute for High Temperatures, Russian Academy of Science, Izhorskaya 13/19, Moscow, 125412 Russia

A.V. Fyodorov
Associated Institute for High Temperatures, Russian Academy of Science, Izhorskaya 13/19, Moscow, 125412 RUSSIA

E. Kh. Isakaev
Science and Engineering Center for Energy-Efficient Processes and Equipment of Joint, Institute for High Temperatures of Russian Academy of Sciences Izhorskaya 13/19, Moscow, 127412, Russia

O. A. Sinkevich
Science Technological Center of Associated Institute for High Temperature, Russian Academy of Science and Moscow Power Engineering Institute (Technical University), Russia

ABSTRACT

The rotational T_r and vibrational T_v temperatures in the relaxation zone of high enthalpy atmospheric pressure nitrogen plasma jets are derived using the line-by-line numerical simulation of the (0-0), (0-1) and (1-2) bands of the N₂⁺ First Negative System and the integrated intensities of the N₂ Second Positive System bands belonging to the sequence Δv=−1. Also involved are several CN “violet” bands of the principal sequence (Δv=0). Plasma jets are generated by a high-current electric arc plasmatron with a divergent channel-anode and vortex stabilization by a plasma-forming gas. A simplified model describing the kinetics of atomic nitrogen has been developed. This model combined with the previously obtained data on the electron component in the relaxation zone is applied to describe varying the magnitudes of T_r and T_v with distance from the plasmatron cathode. It is shown that the three-body recombination of atomic nitrogen and electron-ion dissociative recombination are capable of considerably slowing down a drop in rotational and vibrational temperatures in the far relaxation zone.