Electric Arc Fluctuations in DC Plasma Spray Torch

被引:1
作者
V. Rat
F. Mavier
J. F. Coudert
机构
[1] University of Limoges,CNRS, SPCTS, UMR7315
来源
Plasma Chemistry and Plasma Processing | 2017年 / 37卷
关键词
Electric arc; DC plasma spray torch; Voltage fluctuations; Fluctuation modes;
D O I
暂无
中图分类号
学科分类号
摘要
Direct current plasma torches for plasma spraying applications generate electric arc instabilities. The resulting fluctuations of input electrical power hamper a proper control of heat and momentum transfers to materials for coating deposition. This paper gives an overview of major issues about arc instabilities in conventional DC plasma torches. Evidences of arc fluctuations and their consequences on plasma properties and on material treatments are illustrated. Driving forces applied to the arc creating its motion are described and emphasis is put on the restrike mode that depends on the arc reattachment and the boundary layer properties around the arc column. Besides the arc root shown as a key region of instability, the Helmholtz oscillation is also described and accounts for the whole plasma torch domain that can generate pressure fluctuations coupled with voltage ones.
引用
收藏
页码:549 / 580
页数:31
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