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Characteristics of helium DC plasma jets at atmospheric pressure with multiple cathodes

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文摘 A novel DC plasma torch with multiple cathodes is developed for generating laminar, transitional and turbulent plasma jets. The jet's characteristics, including jet appearance, voltage fluctuation, thermal efficiency, specific enthalpy, and distributions of temperature, pressure, and velocity, are experimentally investigated. The results show that as the gas flow rate increases, the plasma jet transforms first from the laminar state to the transitional state and second to the turbulent state. Compared with the transitional/turbulent jet, the laminar jet possesses not only a better stability and a longer hightemperature zone but also a higher average/core temperature and a higher specific enthalpy at the nozzle's outlet. With the change of jet states from the laminar to the turbulent flow, the core pressure and velocity at the nozzle's outlet increase, while the decaying rates of temperature/pressure/velocity along the jet's axial direction increase sharply. Furthermore, applications of laminar, transitional and turbulent jets for zirconia spray coating are described. The test results indicate that the long laminar jet is favorable for the deposition of a high-quality coating because the powder particles injected into the laminar jet may have better heating and lower kinetic energy.
来源 Chinese Physics. B ,2017,26(8):085207-1-085207-9 【核心库】
DOI 10.1088/1674-1056/26/8/085207
关键词 arc plasma jet ; jet appearance ; jet parameters distribution ; zirconia coating
地址

1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, 230027  

2. Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031

语种 英文
文献类型 研究性论文
ISSN 1674-1056
学科 物理学
基金 the Fundamental Research Funds for the Central Universities, China ;  国家自然科学基金
文献收藏号 CSCD:6072393

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引证文献 6 篇

1 赵曰峰 大气压甲烷针-板放电等离子体中粒子密度和反应路径的数值模拟 物理学报,2018,67(8):085202-1-085202-10
被引 5 次

2 Qiu Jier Design and characteristics of a triple- cathode cascade plasma torch for spheroidization of metallic powders Plasma Science & Technology,2020,22(11):115503
被引 0 次

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