On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch

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The dynamic behavior of the anode-arc-root at the nozzle surface of a plasma torch was experimentally investigated in this work. A gas (N2) vortex-stabilized non-transferred arc torch with a thoriated tungsten rod (2wt %) cathode (3.2 mm diameter) and a coaxial anode (5 mm diameter, 30 mm length) wa...

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Autores principales: Prevosto, L., Risso, M., Infante, D., Cejas, E., Kelly, H., Mancinelli, B.
Formato: CONF
Materias:
Anodes
Cathodes
Dynamics
Electrodes
Fighter aircraft
Flow of gases
Nozzles
Plasma jets
Plasma torches
Probes
Anode surfaces
Dominant frequency
Dynamic behaviors
Floating conditions
Nozzle surface
Thoriated tungsten
Time correlations
Transferred arcs
Hard facing
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_17426588_v370_n1_p_Prevosto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_17426588_v370_n1_p_Prevosto
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spelling todo:paper_17426588_v370_n1_p_Prevosto2023-10-03T16:30:44Z On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch Prevosto, L. Risso, M. Infante, D. Cejas, E. Kelly, H. Mancinelli, B. Anodes Cathodes Dynamics Electrodes Fighter aircraft Flow of gases Nozzles Plasma jets Plasma torches Probes Anode surfaces Dominant frequency Dynamic behaviors Floating conditions Nozzle surface Thoriated tungsten Time correlations Transferred arcs Hard facing The dynamic behavior of the anode-arc-root at the nozzle surface of a plasma torch was experimentally investigated in this work. A gas (N2) vortex-stabilized non-transferred arc torch with a thoriated tungsten rod (2wt %) cathode (3.2 mm diameter) and a coaxial anode (5 mm diameter, 30 mm length) was used in the experiment. By using a sweeping Langmuir probe in floating condition, the voltage of the plasma jet outside the nozzle was inferred. Arc voltage waveforms were also obtained. Data have been obtained for an arc current of 100 A and a gas flow rate of 30 Nl min-1. A typical sawtooth shape (i.e., restrike mode) (with a fluctuating level of ≈ ± 25 %) and a dominant frequency of ≈ 6.5 kHz was observed in the arc voltage waveforms, which is attributed to anode-arc-root movements along the anode surface followed by a restrike at a certain point close to the cathode. By performing a time correlation between the probe and arc voltage oscillograms together with simple estimations, the amplitude of the movement of the arc-root along the anode surface as well its velocity were inferred. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17426588_v370_n1_p_Prevosto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anodes
Cathodes
Dynamics
Electrodes
Fighter aircraft
Flow of gases
Nozzles
Plasma jets
Plasma torches
Probes
Anode surfaces
Dominant frequency
Dynamic behaviors
Floating conditions
Nozzle surface
Thoriated tungsten
Time correlations
Transferred arcs
Hard facing
spellingShingle Anodes
Cathodes
Dynamics
Electrodes
Fighter aircraft
Flow of gases
Nozzles
Plasma jets
Plasma torches
Probes
Anode surfaces
Dominant frequency
Dynamic behaviors
Floating conditions
Nozzle surface
Thoriated tungsten
Time correlations
Transferred arcs
Hard facing
Prevosto, L.
Risso, M.
Infante, D.
Cejas, E.
Kelly, H.
Mancinelli, B.
On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
topic_facet Anodes
Cathodes
Dynamics
Electrodes
Fighter aircraft
Flow of gases
Nozzles
Plasma jets
Plasma torches
Probes
Anode surfaces
Dominant frequency
Dynamic behaviors
Floating conditions
Nozzle surface
Thoriated tungsten
Time correlations
Transferred arcs
Hard facing
description The dynamic behavior of the anode-arc-root at the nozzle surface of a plasma torch was experimentally investigated in this work. A gas (N2) vortex-stabilized non-transferred arc torch with a thoriated tungsten rod (2wt %) cathode (3.2 mm diameter) and a coaxial anode (5 mm diameter, 30 mm length) was used in the experiment. By using a sweeping Langmuir probe in floating condition, the voltage of the plasma jet outside the nozzle was inferred. Arc voltage waveforms were also obtained. Data have been obtained for an arc current of 100 A and a gas flow rate of 30 Nl min-1. A typical sawtooth shape (i.e., restrike mode) (with a fluctuating level of ≈ ± 25 %) and a dominant frequency of ≈ 6.5 kHz was observed in the arc voltage waveforms, which is attributed to anode-arc-root movements along the anode surface followed by a restrike at a certain point close to the cathode. By performing a time correlation between the probe and arc voltage oscillograms together with simple estimations, the amplitude of the movement of the arc-root along the anode surface as well its velocity were inferred.
format CONF
author Prevosto, L.
Risso, M.
Infante, D.
Cejas, E.
Kelly, H.
Mancinelli, B.
author_facet Prevosto, L.
Risso, M.
Infante, D.
Cejas, E.
Kelly, H.
Mancinelli, B.
author_sort Prevosto, L.
title On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
title_short On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
title_full On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
title_fullStr On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
title_full_unstemmed On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
title_sort on the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
url http://hdl.handle.net/20.500.12110/paper_17426588_v370_n1_p_Prevosto
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