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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimir: 1093-3611
ISSN En Línea: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v1.i2.20
pages 167-178

MOTION OF ANODE ATTACHMENT AND FLUCTUATIONS OF PLASMA JET IN DC ARC PLASMA TORCH

Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague
M. Konrad
TECOSIM Technische Simulation Gmbh Robert-Bosch-Str. 10, D-50769 Collogne, Germany; and Institute of Plasma Physics, Za Slovankou 3, 182 00, Praha 8, Czech Republic
Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
J. Hlina
Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejskova 5, 182 00 Praha 8, Czech Republic
J. Benes
Institute of Thermodynamics ASCR, Dolejskova 2, 182 00 Prague 8, Czech Republic
E. Vesely
Institute of Thermodynamics ASCR, Dolejskova 2, 182 00 Prague 8, Czech Republic

SINOPSIS

The anode attachment region of a dc arc in the plasma torch with water stabilization was studied using high speed photography and time resolved measurement of light radiation intensity. The motion of anode attachment on the electrode surface in the restrike mode was investigated. The downstream motion of the anode attachment proceeds in the small scale jumps related to the small scale restrikes. The velocity of the motion is affected by the arc current and by position of the anode relative to the arc column. The velocity varies during the downstream motion of the spot in correlation with the variations of plasma flow velocity. The anode jet is created on the surface of the electrode and its interaction with the main jet causes instability of the main jet. The experimental results well correspond to the assumption that diffusion electron currents flowing between the arc plasma and the anode surface are principal cause of formation of new arc attachment and that the energy balance on the anode surface and in the adjacent gap of partially ionized gas is decisive rather than electric breakdown of the gap.


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