Design and Characteristics of a Laminar Plasma Torch for Materials Processing

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• 作者：Xiuquan Cao ; Deping Yu ; Meng Xiao ; Jianguo Miao…
• 关键词：Laminar plasma torch ; Laminar plasma jet ; Specific enthalpy ; Jet length ; Materials processing
• 刊名：Plasma Chemistry and Plasma Processing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：36
• 期：2
• 页码：693-710
• 全文大小：4,346 KB
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• 作者单位：Xiuquan Cao (1)
  Deping Yu (1)
  Meng Xiao (1)
  Jianguo Miao (1)
  Yong Xiang (1)
  Jin Yao (1)
  
  1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics
  Characterization and Evaluation Materials
  Mechanical Engineering
  Inorganic Chemistry
  Nuclear Physics, Heavy Ions and Hadrons
  
• 出版者：Springer Netherlands
• ISSN：1572-8986

文摘

Thermal plasma jets have been widely used in various materials processing techniques. However, the conventional thermal plasma torches usually generate turbulent plasma jets with the disadvantages of high axial temperature gradient, a short jet length and difficulties in the process control relatively, limiting its applications to materials processing. Therefore, this paper proposes a new laminar plasma torch (LPT) working with pure nitrogen to generate laminar plasma jet (LPJ). Its design and structural characteristics, e.g. segmented anode, axial gas injection, parallel water cooling structure, etc., are detailed to ensure the stability, the favorable temperature and velocity distribution of the generated LPJ. Experiments on the characteristics of the LPT showed that the generated LPJ possessed high specific enthalpy (ranging between 10 and 90 kJ/g), long jet length (maximum length: 480 mm) and low axial temperature gradient, and its output power a current and the gas flow rate. In addition, the thermal efficiency of the LPT was experimentally determined to be ranging between 25 and 45 %. Furthermore, experiment and simulation on the application of the LPJ for surface quenching verified the even radial temperature distribution of the plasma jet and high heat flux density brought to the surface. Keywords Laminar plasma torch Laminar plasma jet Specific enthalpy Jet length Materials processing