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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

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

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

DOI: 10.1615/HighTempMatProc.v8.i4.70
pages 575-583

PROPERTIES OF PLASMA JET GENERATED IN HYBRID GAS/WATER TORCH UNDER REDUCED PRESSURES

Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague
Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, 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
T. Kavka
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

ABSTRAKT

Thermal plasma jet was generated in dc torch with hybrid argon/water arc stabilization at different ambient pressures ranging from atmospheric pressure to 4 kPa. Characteristics of the arc discharge and power balances were measured and the jet was imaged by a fast shutter CCD camera. Velocity of plasma flow and Mach number were determined from the analysis of fluctuations of emitted light recorded by a photo-diode array. Changes of the structure and the velocity of plasma flow in the jet downstream of the torch nozzle with decreasing pressure were studied. The flow pattern typical for supersonic regime with shock wave close to the nozzle exit followed by an expansion appeared for pressures below 40 kPa. The size of expansion zone substantially increased with reducing pressure below 10 kPa.


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