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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Druckformat: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v14.i1-2.50
pages 63-76

PARAMETRIC STUDY OF HYBRID ARGON-WATER STABILIZED ARC UNDER SUBSONIC AND SUPERSONIC REGIMES

Jiri Jenista
Institute of Plasma Physics ASCR, Za Slovankou 3, 182 21 Prague
H. Takana
Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577
H. Nishiyama
Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577
Milada Bartlova
Brno University of Technology, Technicka 8, 616 00 Brno
Vladimir Aubrecht
Brno University of Technology, Technicka 8, 616 00 Brno, Czech Republic
Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague

ABSTRAKT

Numerical investigation of characteristics and processes in the worldwide unique type of thermal plasma generator with combined stabilization of arc by argon flow and water vortex, the so-called hybrid arc, has been carried out. The aim of this paper is a numerical study of characteristics and processes in the hybrid arc under both subsonic plasma flow regime and transonic and supersonic flow regimes at high currents and argon mass flow rates at atmospheric pressure. The partial characteristics method for radiation loss from the arc is employed. Results carried out for 300−600 A and for argon mass flow rates of 22.5−32.5 slm (standard litre per minute) proved that structure of plasma flow and temperature field can be subsonic or supersonic depending on the operating conditions: a transonic flow occurs for currents 400−500 A, a supersonic one appears for 600 A in the central regions of the discharge.