Original title: Investigation of diffuse current in arc boundary by electric probes
Translated title: Difuzní proud v hraniční oblasti oblouku měřený elektrickými sondami
Authors: Chumak, Oleksiy ; Hrabovský, Milan ; Kavka, Tetyana ; Kopecký, Vladimír
Document type: Papers
Conference/Event: Annual Conference of Doctoral Students WDS 05/14th./, Praha (CZ), 2005-06-07 / 2005-06-10
Year: 2005
Language: eng
Abstract: [eng] [cze]
Electric probes were used for investigation of an intermediate layer between the arc and anode surface in regions outside the main current channel. Distributions of a diffuse current and the potential were measured. Resistance and heating of the intermediate layer by diffuse current were evaluated. It was found that not only the value of diffuse current strongly depends on distance from the arc but also the shape of the distribution and the position of the maximum of the current change with the distance. These trends can be explained by expanding of the plasma jet. Evaluated equivalent intermediate layer resistance shows widening of the conductive region in a stream wise direction. Variation of resistivity of the intermediate layer is much higher than variation of the potential drop on the layer. That means that distributed current as well as Joule heating of the layer are generally controlled by distributed resistance. Vlastnosti přechodové vrstvy mezi hranicí elektrického oblouku a povrchem anody byly zjišťovány elektrickými sondami. Bylo změřeno rozložení difuzního proudu a potenciálu a vyhodnoceno rozložení odporu v přechodové vrstvě. Ukazuje se, že rozložení proudu a Jouleův ohřev vrstvy jsou dány rozložením odporu.
Keywords: Anode attachment; arc boundary; diffuse current
Project no.: CEZ:AV0Z20430508 (CEP)
Host item entry: WDS´ 05Proceedings of contributed papers, ISBN 80-86732-59-2

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0116177

Permalink: http://www.nusl.cz/ntk/nusl-32854


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Research > Institutes ASCR > Institute of Plasma Physics
Conference materials > Papers