Dependence of Thermal Plasma Flow Velocity on Arc Current Determined by Correlation Analysis of Optical Records

0363825 - ÚT 2012 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Gruber, Jan - Šonský, Jiří - Hlína, Jan
Dependence of Thermal Plasma Flow Velocity on Arc Current Determined by Correlation Analysis of Optical Records.
XIXth Symposium on Physics of Switching Arc. Brno: Brno University of Technology, 2011 - (Aubrecht, V.; Bartlová, M.), s. 201-204. ISBN 978-80-214-4293-1.
[Symposium on Physics of Switching Arc /19./. Nové Město na Moravě (CZ), 05.09.2011-09.09.2011]
Výzkumný záměr: CEZ:AV0Z20570509
Klíčová slova: thermal plasma * plasma jets * correlation
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

Optical radiation of thermal plasma jet was recorded in two parallel cross-sections perpendicular to the jet axis and separated by 3.5 mm. Sufficient sampling rate was a prerequisite to obtain detectable shift between the time-series recorded in closer and farther cross-sections. We have determined time lags between the recorded signals both in the core and boundary regions by correlation analysis and subsequently determined associated velocities of plasma flow. Arc current was gradually increased in respective measurements, gas flow was fixed. Determined flow velocities are in the range 140 m/s - 280 m/s in the jet core and 110 m/s – 220 m/s in the boundary region. This is in agreement with the results obtained for similar plasma torches by other methods in the past. Velocity increases with arc current almost linearly and this dependence and velocity profile in the plasma jet cross-section are presented in this paper.
Trvalý link: http://hdl.handle.net/11104/0199477