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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v1.i2.10
pages 149-166

ARC INSTABILITIES IN A D.C. PLASMA TORCH

J. F. Coudert
Laboratoire Sciences des Procédés Céramiques et Traitements de Surface, UMR-CNRS 6638, Université de Limoges, 87060 Limoges Cedex, France
Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France

RESUMO

Arc instabilities play a crucial role in the dynamics of the plasma flow generated by industrial torches such as those used, for example, in plasma spray processes. This study was conducted for a classically designed plasma spray torch, with power supplied by a current regulated rectifier. Arc instabilities were investigated by means of time-resolved measurements of arc voltage fluctuations, which showed very specific features. Numerous experimental results were obtained and correlated with the plasma torch governing parameters, with help of dimensional analysis. At the same time, important temperature and flow velocity variations were observed, which appeared to be strongly coupled to voltage fluctuations.


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