Open AccessDiagnostics of Plasma Jet Generated in Water/Argon DC Arc Torch
Author(s) -
O. Hurba,
M. Hlína,
Milan Hrabovský
Publication year - 2016
Publication title -
plasma physics and technology
Language(s) - English
Resource type - Journals
eISSN - 2336-2634
pISSN - 2336-2626
DOI - 10.14311/ppt.2016.1.5
Subject(s) - plasma torch , schlieren , plasma , argon , jet (fluid) , plasma diagnostics , torch , schlieren imaging , langmuir probe , materials science , turbulence , atomic physics , analytical chemistry (journal) , chemistry , mechanics , physics , metallurgy , nuclear physics , chromatography , welding
Thermal plasma jet generated by the torch with water/argon stabilized arc was investigated. Plasma torches of this type have been used for plasma spraying, waste treatment and gasification of organic materials. Electric probes, enthalpy probe, and schlieren photography were used for diagnostics of the jet in the region downstream of the torch exit. Information about structure and shape of plasma jet was evaluated from the measured data. Large extent of radial plasma spread and high level of turbulence were found from both the schlieren and the probe diagnostics. Plasma temperature corresponding to measured ion saturation currents was determined using calculated composition of plasma assuming ex-istence of local thermodynamic equilibrium.