期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 31, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6595/ac5c5e
关键词
high-speed plasma; electron density; electron temperature; triple probe; expansion-compression; nonequilibrium; weakly compressible
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA17030100]
- National Natural Science Foundations of China [11735004, 11575273]
- Hainan Province Science and Technology Special Fund [ZDKJ2019004]
- LHD Youth Innovation Fund from the State Key Laboratory of High Temperature Gas Dynamics
In this study, a weakly compressible plasma jet produced by an arc torch was diagnosed using a Langmuir triple probe. The two-dimensional distributions of electron density and electron temperature were obtained, revealing that in some regions of the plasma jet, electron density increases while electron temperature decreases with an increase in arc power.
High-speed plasma plays an important role in diverse areas. Plasma flow with a sufficiently high speed to arouse compression is usually not in thermal equilibrium, and the plasma characteristics are closely coupled with the flow field. The relation between the flow and the plasma parameters, especially the distributions of electron density, i.e. n (e), and the electron temperature, i.e. T (e), are of ultimate importance; however, this is not yet completely understood. In this work, a weakly compressible plasma jet produced by an arc torch is diagnosed using a Langmuir triple probe. The two-dimensional distributions of n (e) and T (e) are obtained consisting of 80 spatial points under arc currents of 70-100 A. The spatial patterns of the distributions demonstrate alternative expansion-compression wave structures. As the arc power increases, the wave structures remain almost unchanged, while n (e) increases monotonically. Moreover, in some regions T (e) decreases with the arc power, which has seldom been reported in the literature. In addition, the peaks of the radial distributions of T (e) always deviate from the central axis. These results are compared with previous works of strongly compressible plasma flows. The phenomena are then analyzed and explained from the perspective of fluid wave-plasma interactions and the actions of the ambipolar field in the electrons.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据