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ISSN: 1093-3611 Print
ISSN: 1940-4360 Online
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DOI: 10.1615/HighTempMatProc.v9.i3
Pages: 156
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DOI: 10.1615/HighTempMatProc.v9.i3.60
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Article price - $35.00 |
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EFFECT OF PRESSURE ON BEHAVIOR OF ANODE ATTACHMENT OF DC ARC PLASMA TORCH
Milan Hrabovsky
Thermal Plasma Department, Institute of Plasma Physics, Za Slovankou 3, 18200, Praha 8, Czech Republic
O. Chumak
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
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
T. Kavka
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
ABSTRACT
Anode attachment region of dc arc in hybrid argon/water plasma torch was studied at different controlled atmosphere chamber pressures. Pictures of the anode region were taken by CCD camera and voltage fluctuations, caused by anode attachment movement in a restrike mode, were measured by high frequency voltage dividers. The velocity of downstream movement of anode attachment increased with the reduction of pressure and the position of the attachment was shifted counter-stream-wise. The amplitude as well as the frequency of saw-tooth voltage fluctuations was reduced with decreasing pressure. For ambient pressures lower than 30 kPa the constricted anode attachment was not observed and the anode region has diffuse character. The change of anode attachment regime coincides with change of character of the jet flow from subsonic to supersonic. The measured dependences are explained by changes in the sheath between the plasma jet and the anode surface.
pages 391-399
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