4.6 Article

The distribution pattern of the electron density and the electron temperature in a weakly compressible argon plasma jet measured by a Langmuir triple probe

Journal

PLASMA SOURCES SCIENCE & TECHNOLOGY
Volume 31, Issue 4, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6595/ac5c5e

Keywords

high-speed plasma; electron density; electron temperature; triple probe; expansion-compression; nonequilibrium; weakly compressible

Funding

  1. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA17030100]
  2. National Natural Science Foundations of China [11735004, 11575273]
  3. Hainan Province Science and Technology Special Fund [ZDKJ2019004]
  4. LHD Youth Innovation Fund from the State Key Laboratory of High Temperature Gas Dynamics

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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.

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