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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Druckformat: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v8.i4.60
pages 563-573

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

ABSTRAKT

The rotational Tr and vibrational Tv 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 Tr and Tv 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.


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