On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch
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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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v370_n1_p_Prevosto http://hdl.handle.net/20.500.12110/paper_17426588_v370_n1_p_Prevosto |
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paper:paper_17426588_v370_n1_p_Prevosto2023-06-08T16:27:22Z On the dynamic behavior of the anode-arc-root at the nozzle surface in a non-transferred plasma torch Kelly, Héctor Juan 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v370_n1_p_Prevosto 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 Kelly, Héctor Juan 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. |
| author |
Kelly, Héctor Juan |
| author_facet |
Kelly, Héctor Juan |
| author_sort |
Kelly, Héctor Juan |
| 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 |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17426588_v370_n1_p_Prevosto http://hdl.handle.net/20.500.12110/paper_17426588_v370_n1_p_Prevosto |
| work_keys_str_mv |
AT kellyhectorjuan onthedynamicbehavioroftheanodearcrootatthenozzlesurfaceinanontransferredplasmatorch |
| _version_ |
1768544153201803264 |