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Operational features and air plasma characteristics of a thermal plasma torch with hollow electrodes

Cited 19 time in Web of Science Cited 19 time in Scopus
Issue Date
2003-05
Publisher
Institute of Physics
Citation
Plasma Sources Sci. Technol. 12(2) 255-264
Keywords
plasma torchhollow electrodesair plasma characteristicsoperational featuresnumerical modelingcathod spot position
Abstract
The operational features and thermal plasma characteristics of a plasma torch with hollow electrodes are investigated based on their dependence on input current, gas flow rate and electrode diameter when air is used as a plasma gas. A plasma torch with a hollow cathode and anode has been designed and fabricated, and the arc voltages and thermal efficiencies are measured from its discharge. The newly modified similarity criteria are derived from the measured data related to torch performances. From the fact
that these criteria successfully describe both the arc voltage and thermal efficiency behaviour of the torch, depending on its operating and geometrical parameters, it is proved that they can be usefully applied to the design and operation of high power torches. For the numerical modelling of the interior region of the torch, a cold flow analysis is employed along with a simplified balance equation of the Lorentz and gas dynamic drag forces in order to determine a cathode spot position on the cathode surface. The validity of this method is confirmed by comparison of the calculated and
measured net powers. As a practically useful result of this analysis, carried out through this numerical and experimental work, it is suggested that low input current, high gas flow rate and relatively large electrode diameter are more favourable as appropriate operating conditions of the torch for the
efficient treatment of hazardous organic wastes.
ISSN
0963-0252
Language
English
URI
https://hdl.handle.net/10371/69565
DOI
https://doi.org/10.1088/0963-0252/12/2/317
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Nuclear Engineering (원자핵공학전공)Journal Papers (저널논문_원자핵공학과)
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