High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

Best Paper Award Selection - Editorial Board Site

2005, Volume9

Issue 1

162 pages

DOI: 10.1615/HighTempMatProc.v9.i1

Issue price - $144.00

J. Gregor
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, 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

Milan Hrabovsky
Thermal Plasma Department, Institute of Plasma Physics, Za Slovankou 3, 18200, Praha 8, Czech Republic

Effect of reduction of ambient pressure on properties of thermal plasma jet was studied for pressure range of 100 kPa - 4 kPa. Plasma jet was generated by the DC torch with water-argon stabilization. Properties of the plasma jet were measured by enthalpy probe TEKNA connected to mass spectrometer. Temperature and velocity fields within the jet were evaluated from the measured values. Variations of the chamber pressure between atmospheric and 20 kPa resulted in little changes of plasma jet parameters. Reduction of the pressure below 20 kPa led to drastic velocity rise due to transition of the plasma flow from subsonic to supersonic. CCD camera images show the under-expanded character of the flow with hot exiting plume followed by the expansion. Dependences of the plasma jet characteristics on pressure, arc current and flow rate of plasma forming gas were studied.

DOI: 10.1615/HighTempMatProc.v9.i1.50 Download article, 45-53 pages

Article price - $35.00

<< Previous article   Next article >>