Vacuum Plasmatrons with Hollow Cathode: Gas-Dynamic Plasma Processes in the Hollow Cathode

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Engineering Thermophysics Pub Date : 2023-11-08 DOI:10.1134/S1810232823030153

P. V. Domarov, V. A. Serikov, A. E. Morev, O. S. Cherednichenko

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Abstract

It is shown that it is necessary for vacuum plasmatron with hollow cathode to meet the technical requirements to the hollow cathode pipeline to provide not only the necessary kinetic energy of the gas involved in the formation of working parameters in the cavity cathode but also to ensure the stable operation conditions for vacuum plasmatron at large current without the occurrence of high-frequency oscillations in the plasmatron electrical circuit. The pipeline maximum length has been established, guaranteeing the speed of gas at its final section and equals to the speed of sound at the output; the results of mathematical modeling and experimental investigated parameters for developing gas-dynamic processes in hollow cold and hot cathodes of vacuum plasmatrons are presented. The start-up modes ranges for warming up the cavity cathode and continuous discharge output with hollow cathode into working modes with flowing currents up to 10000 A are considered. The occurrence and development of the gradient pressure, density, velocity mass flow rate at heating the cathode and the gradient increase temperature effect of the cathode edge with forming current conductivity active zone in the cylindrical cathode are shown.

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空心阴极真空等离子体激元：空心阴极中的气体动力学等离子体过程

结果表明，具有空心阴极的真空等离子体管必须满足对空心阴极管道的技术要求，不仅要为腔阴极中工作参数的形成提供所需的气体动能，而且要确保真空等离子体管在大电流下稳定运行等离子体管电路中的高频振荡。管道的最大长度已经确定，保证了气体在其最后一段的速度，等于输出时的声速；给出了在真空等离子管的空心冷阴极和热阴极中发展气体动力学过程的数学模型和实验研究参数的结果。考虑了将空腔阴极预热和空心阴极连续放电输出到流动电流高达10000A的工作模式的启动模式范围。显示了阴极加热时梯度压力、密度、速度和质量流量的发生和发展，以及阴极边缘随着圆柱形阴极中导电活性区的形成而产生的梯度升温效应。

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来源期刊

Journal of Engineering Thermophysics THERMODYNAMICS-ENGINEERING, MECHANICAL

CiteScore

2.30

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.