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Progress in Plasma Processing of Materials, 2003

ISBN:
978-1-56700-192-1 (Print)
978-1-56700-447-2 (Online)

ON THE PECULIARITIES OF THE NEAR-ANODE REGION IN DIVERGENTS CHANNELS PLASMATRONS WITH A VORTEX STABILIZATION

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

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

A. V. Markin
Science and Engineering Centre for Energy Efficient Processes and Equipment, Associated Institute for High Temperatures, 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

Abstract

It is shown that in high-current (I≥ 250 A, I/d≥40 A/mm) plasmatrons with a self-established arc length and divergent anode channel there exists a region of stable laminar arc burnign exhibiting a diffuse flow of the electric current arriving at the anode. The most important mechanism of volume ionization in the "plasma-anode wall" transition layer is the photoionization of the cold near-surface gas layer by VUV-radiation emitted by a fully ionized plasma of the arc core at a temperature of above 20 000 K.