INVESTIGADORES
PREVOSTO Leandro
artículos
Título:
Determination of plasma velocity from light fluctuations in a cutting torch
Autor/es:
LEANDRO PREVOSTO; HÉCTOR KELLY; BEATRIZ MANCINELLI
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AIP
Referencias:
Lugar: New York; Año: 2009 vol. 106 p. 1 - 4
ISSN:
0021-8979
Resumen:
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.