Determination of plasma velocity from light fluctuations in a cutting torch

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Measurements of plasma velocities in a 30 A high energy density cutting torch are reported. The velocity diagnostic is based on the analysis of the light fluctuations emitted by the arc which are assumed to propagate with the flow velocity. These light fluctuations originate from plasma temperature...

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Autores principales: Prevosto, L., Kelly, H., Mancinelli, B.
Formato: JOUR
Materias:
Cutting torch
High energy densities
Hydrodynamic instabilities
Light fluctuation
Light sensor
Nozzle exits
Numerical code
Plasma density fluctuations
Plasma temperature
Plasma velocity
Bandpass filters
Cavity resonators
Fluid dynamics
Plasma density
Plasma diagnostics
Plasma jets
Plasmas
Velocity
Plasma stability
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00218979_v106_n5_p_Prevosto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00218979_v106_n5_p_Prevosto
record_format dspace
spelling todo:paper_00218979_v106_n5_p_Prevosto2023-10-03T14:22:07Z Determination of plasma velocity from light fluctuations in a cutting torch Prevosto, L. Kelly, H. Mancinelli, B. Cutting torch High energy densities Hydrodynamic instabilities Light fluctuation Light sensor Nozzle exits Numerical code Plasma density fluctuations Plasma temperature Plasma velocity Bandpass filters Cavity resonators Fluid dynamics Plasma density Plasma diagnostics Plasma jets Plasmas Velocity Plasma stability Measurements of plasma velocities in a 30 A high energy density cutting torch are reported. The velocity diagnostic is based on the analysis of the light fluctuations emitted by the arc which are assumed to propagate with the flow velocity. These light fluctuations originate from plasma temperature and plasma density fluctuations mainly due to hydrodynamic instabilities. Fast photodiodes are employed as the light sensors. The arc core velocity was obtained from spectrally filtered light fluctuations measurements using a band-pass filter to detect light emission fluctuations emitted only from the arc axis. Maximum plasma jet velocities of 5000 m s -1 close to the nozzle exit and about 2000 m s -1 close to the anode were found. The obtained velocity values are in good agreement with those values predicted by a numerical code for a similar torch to that employed in this work. © 2009 American Institute of Physics. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00218979_v106_n5_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 Cutting torch
High energy densities
Hydrodynamic instabilities
Light fluctuation
Light sensor
Nozzle exits
Numerical code
Plasma density fluctuations
Plasma temperature
Plasma velocity
Bandpass filters
Cavity resonators
Fluid dynamics
Plasma density
Plasma diagnostics
Plasma jets
Plasmas
Velocity
Plasma stability
spellingShingle Cutting torch
High energy densities
Hydrodynamic instabilities
Light fluctuation
Light sensor
Nozzle exits
Numerical code
Plasma density fluctuations
Plasma temperature
Plasma velocity
Bandpass filters
Cavity resonators
Fluid dynamics
Plasma density
Plasma diagnostics
Plasma jets
Plasmas
Velocity
Plasma stability
Prevosto, L.
Kelly, H.
Mancinelli, B.
Determination of plasma velocity from light fluctuations in a cutting torch
topic_facet Cutting torch
High energy densities
Hydrodynamic instabilities
Light fluctuation
Light sensor
Nozzle exits
Numerical code
Plasma density fluctuations
Plasma temperature
Plasma velocity
Bandpass filters
Cavity resonators
Fluid dynamics
Plasma density
Plasma diagnostics
Plasma jets
Plasmas
Velocity
Plasma stability
description Measurements of plasma velocities in a 30 A high energy density cutting torch are reported. The velocity diagnostic is based on the analysis of the light fluctuations emitted by the arc which are assumed to propagate with the flow velocity. These light fluctuations originate from plasma temperature and plasma density fluctuations mainly due to hydrodynamic instabilities. Fast photodiodes are employed as the light sensors. The arc core velocity was obtained from spectrally filtered light fluctuations measurements using a band-pass filter to detect light emission fluctuations emitted only from the arc axis. Maximum plasma jet velocities of 5000 m s -1 close to the nozzle exit and about 2000 m s -1 close to the anode were found. The obtained velocity values are in good agreement with those values predicted by a numerical code for a similar torch to that employed in this work. © 2009 American Institute of Physics.
format JOUR
author Prevosto, L.
Kelly, H.
Mancinelli, B.
author_facet Prevosto, L.
Kelly, H.
Mancinelli, B.
author_sort Prevosto, L.
title Determination of plasma velocity from light fluctuations in a cutting torch
title_short Determination of plasma velocity from light fluctuations in a cutting torch
title_full Determination of plasma velocity from light fluctuations in a cutting torch
title_fullStr Determination of plasma velocity from light fluctuations in a cutting torch
title_full_unstemmed Determination of plasma velocity from light fluctuations in a cutting torch
title_sort determination of plasma velocity from light fluctuations in a cutting torch
url http://hdl.handle.net/20.500.12110/paper_00218979_v106_n5_p_Prevosto
work_keys_str_mv AT prevostol determinationofplasmavelocityfromlightfluctuationsinacuttingtorch
AT kellyh determinationofplasmavelocityfromlightfluctuationsinacuttingtorch
AT mancinellib determinationofplasmavelocityfromlightfluctuationsinacuttingtorch
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