Indexed by:期刊论文

Date of Publication:2013-09-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:15

Issue:9

Page Number:875-880

ISSN No.:1009-0630

Key Words:DC arc torch; plasma jet; shock wave; electron temperature; vibrational temperature; rotational temperature; emission spectral diagnosis

Abstract:In this paper, a low pressure Ar/N-2 shock plasma jet with clearly multicycle alternating zones produced by a DC cascade arc discharge has been investigated by an emission spectral method combined with Abel inversion analysis. Plasma emission intensity, electron, vibrational and rotational temperatures of the shock plasma have been measured in the expansion and compression zones. The results indicate that the ranges of the measured electron temperature, vibrational temperature and rotational temperature are 1.1 eV to 1.6 eV, 0.2 eV to 0.7 eV and 0.19 eV to 0.22 eV, respectively, and it is found for the first time that the vibrational and rotational temperatures increase while the electron temperature decreases in the compression zones. The electron temperature departs from the vibrational and the rotational temperatures due to non-equilibrium plasma effects. Electrons and heavy particles could not completely exchange energy via collisions in the shock plasma jet under the low pressure of 620 Pa or so.