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Progress in Plasma Processing of Materials, 2001

ISBN:
1-56700-165-3 (Print)

CALCULATIONS OF A FREE-BURNING ELECTRIC ARC BY NON-EQUILIBRIUM MODEL

Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

Sergey V. Dresvin
Laboratory of Electrotechnological and Plasma Installation of Polytechnic Institute -SPb State Polytechnical University, 29 Polytechnicheskaya Str., 195251 Saint-Petersburg, Russia

Shi Nguen-Kuok
Laboratory of Electrotechnological and Plasma Installation Polytechnical Institute - University of St-Petersburg, Russia

A.V. Krylov
Dpt. of Electrical Engineering and Electrical Technology - St. Petersburg State Technical University, Polytechnicheskaya Str. 29, 195251 St. Petersburg, Russia

Abstract

In order to investigate the processes in electric arc, a two-temperature approach calculation was carried. In accordance with two-temperature approach plasma of an electric arc consider as a mixture of two interacting components (the electron and atom-ion) with different temperature. Also was taken into account the deviation of plasma from ionization equilibrium. In the framework of calculation was used a model of electric arc, comprising of itself the Navier−Stoks equations, Maxwell equations, energy balance equations for electron and atom-ion plasma components, equations for determination of plasma composition and transport coefficients in non-equilibrium conditions. The calculations were conducted for arcs long L=10÷20mm burning in argon at currents I=50÷150A and gas flow rate G=20l/min. The temperature of electron and atom-ion plasma components, velocity and pressure of plasma, current density and electric field strength was obtained as a result of calculations. Also was carried an analysis of influence the deviation from thermal and ionization equilibrium to plasma composition and transport coefficients. Finally the radial and axial distribution of electron and atom ion temperature, plasma velocity and pressure, the heat flux to the anode was calculated.