Influence of the Gas Injection Angle on the Jet Characteristics of a Non-transferred DC Plasma Torch

• Published in: Plasma chemistry and plasma processing Vol. 36; no. 3; pp. 881 - 889
• Main Authors: Cao, Xiuquan, Yu, Deping, Xiang, Yong, Yao, Jin
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2016
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Classical Mechanics; Inorganic Chemistry; Mechanical Engineering; Original Paper; Gas injection angle; Specific enthalpy; Jet characteristics; Non-transferred DC plasma torch; Jet length
• ISSN: 0272-4324; 1572-8986
• DOI: 10.1007/s11090-016-9702-9

The non-transferred direct current (DC) plasma torch has been widely used in various industrial applications due to its special jet characteristics. The jet characteristics are determined by different factors, including the working parameters, the torch construction, the gas injection angle (GIA) etc. As there is little study on the influence of the GIA on the jet characteristics, experimental study on the GIA’s effects on the jet characteristics has been carried out on a specially designed non-transferred DC plasma torch, whose GIA can be changed by replacing a gas injection component. The arc voltages and thermal efficiencies of the plasma torch, the specific enthalpies and jet lengths of the plasma jets at different working conditions were obtained and analyzed. It has been found that the GIA greatly affects the arc voltage, the thermal efficiency, the specific enthalpy and the jet length. Based on these findings, plasma torch with appropriate GIA could be used to help generating the plasma jet with desired characteristics.