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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
Том 23, 2019 Том 22, 2018 Том 21, 2017 Том 20, 2016 Том 19, 2015 Том 18, 2014 Том 17, 2013 Том 16, 2012 Том 15, 2011 Том 14, 2010 Том 13, 2009 Том 12, 2008 Том 11, 2007 Том 10, 2006 Том 9, 2005 Том 8, 2004 Том 7, 2003 Том 6, 2002 Том 5, 2001 Том 4, 2000 Том 3, 1999 Том 2, 1998 Том 1, 1997

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v11.i2.20
pages 175-180

OSCILLATIONS IN DC PLASMA JET AT REDUCED PRESSURES

Vladimir Kopecky
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic
Milan Hrabovsky
Institute of Plasma Physics, Academy of Sciences Za Slovankou 3, 182 00, Prague

Краткое описание

The oscillations of dc plasma jet generated by the hybrid water/argon plasma torch with external anode were studied at different ambient pressures. Fluctuations of plasma radiation from jet were recorded using system of photo-diodes with high frequency response. The frequency and the phase velocity of plasma flow oscillations were determined for various arc currents and argon flows and various ambient pressures. Two main types of oscillations were observed. The first type of perturbations is connected with a movement of an anode attachment and the second type of oscillations arises from plasma boundary instability. Frequencies of this two types oscillations approach each other when the pressure is reduced and the expansion zone was formed. In this case frequencies of these oscillations were equal to 200−350 kHz and their phase velocities were close to thousand meters per second.