Study on Uniform Electric Field Air Streamer at Low Temperature and Subatmospheric Pressure

Zhao, Zhihang; Wei, Xindong; Guan, Ruiyang; Nie, Hanxiang; Zhu, Bo; Yao, Yuanhang

doi:10.1109/tps.2022.3186808

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The streamer discharge process at 0.5-1 cm was observed with a camera by Sigmond [39]. The definition of the streamer head is based on the method in [40], that is, the streamer head has the maximum field strength. The results show that the further the streamer head is from the rod electrode, the greater the streamer development rate, which can finally reach about 10 6 m s −1 .…”

Section: Streamer Discharge Processmentioning

confidence: 99%

Effects of rod radius and voltage on streamer discharge in a short air gap

Chen

et al. 2023

Plasma Sci. Technol.

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The streamer discharge is the inaugural stage of gas discharge, and the electron average energy directly determines the electron collision reaction rate, which is a key parameter for studying the streamer discharge. Therefore, taking into account the electron average energy, this work establishes a fluid chemical reaction model to simulate and study the streamer discharge’s evolution course in a 5 mm rod-plate gap, considering 12 particles and 27 chemical reactions. It introduces the electron energy drift diffusion equation into the control equation, and analyzes the temporal and spatial changes of electron average energy, electric field intensity and electron density with the change of rod radius and voltage, the effects of voltage and rod radius on the course of streamer discharge can be reflected more comprehensively by combining the average electron energy. Three different values of 0.3 mm, 0.4 mm and 0.5 mm are set for the rod radius, and three different values of 5 kV, 6 kV and 7 kV are set for the voltage. The influence of the excited reaction on the discharge of the streamer is studied. The findings indicate that as voltage raises, the streamer head’s electron density, electric field, and electron average energy all rise, and the streamer develops more quickly. When the rod radius increases, the streamer head’s electron density, electric field, and electron average energy all decrease, and the streamer’s evolution slows down. When the excitation reaction is added to the model, the electron average energy, the magnitude of the electric field and the density of electrons decrease, and the evolution of streamer slows down. The increase of electron average energy will lead to the increase of electric field strength and electron density, and the development of streamer will be faster.

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Section: Streamer Discharge Processmentioning

confidence: 99%

Effects of rod radius and voltage on streamer discharge in a short air gap

Chen

et al. 2023

Plasma Sci. Technol.

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“…面, 随着放电电流增加, 阴极表面辉光面积成比例增加, 而电流密度则保持不变, 相应地, 阴极位降近似为常量, 在CVC曲线上表现为接近水平线 [9] . 已有研究 [92,93] 表明, 电场反转一般发生在短间隙辉光放电的负辉区, 非局域电离是导致放电空间发生电场反转的必要条件.…”

Section: 在正常辉光放电区电流尚未覆盖整个阴极表unclassified

Numerical simulation study on microdischarge via a unified fluid model

Wang,

Zhao,

2024

Acta Phys. Sin.

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Numerical simulation has become an indispensable tool in the study of gas discharge. However, it is typically employed to reveal microscopic properties in a discharge under specific conditions. In this work, a unified fluid model for discharge simulation is introduced in detail. The model includes the continuity equation, the energy conservation equation of the species (electrons and heavy particles), and Poisson's equation. The model takes into account processes such as cathode electron emission (secondary electron emission and thermal emission), reaction enthalpy change, gas heating, and cathode heat conduction. The full CVC curve encompasses a range of discharge regimes, such as the Geiger-Muller regime, Townsend discharge, subnormal glow discharge, normal glow discharge, abnormal glow discharge, and arc discharge. The obtained CVC curve is consistent with the results in the literature, confirming the validity of the unified fluid model. On this basis, the CVC curves are obtained at a wide range of pressures (50 Torr-3000 Torr) conditions. Simulation studies are conducted with a focus on the discharge characteristics for microgap of 400 μm and at pressures of 50 Torr and 500 Torr, respectively. The distributions of typical discharge parameters under different pressure conditions are analyzed by comparison. The results indicate that the electric field in the discharge gap is uniform in the Townsend discharge regime, and the space charge effect can be ignored. The cathode fall and the quasi-neutral regions appear in the glow discharge, and the space charge effect is significant. In particular, the electric field reversal occurs in the abnormal discharge regime due to the heightened particle density gradient. The electron density reaches approximately 1022 m-3 in the arc discharge regime dominated by thermal emission and thermal ionization, as the increase of the current density. The gas temperature peak is 11850 K when the pressure is 500 Torr, and the cathode surface temperature is heated to 400 K due to heat conduction. The present model can realize the simulation of gas discharge across a wide range of condition parameter regimes, which promotes and expands the application of fluid models and aids in achieving a more comprehensive investigation of discharge parameter properties.

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Study on discharge characteristics of low-temperature sub-atmospheric pressure under steep change rate voltage

ZHU 朱,

HAN 韩,

SU 苏

et al. 2025

Plasma Sci. Technol.

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Aiming at the gas discharge problem under the working environment of electric aircraft, this paper studies the gas discharge characteristics at low-temperature sub-atmospheric pressure. In the aspect of experiment, a gas discharge shooting platform was built, and the discharge process was photographed by ICCD. In the aspect of simulation, a two-dimensional axisymmetric model of needle-plate electrode gas discharge is established, and three sets of Helmholtz equations are used to solve the photoionization. The results show that under the same voltage, the electric field intensity in the discharge process increases first, then decreases and finally increases again. The discharge speed increases with the increase of altitude, and the electron density in the streamer decreases with the increase of altitude. The development speed of streamer in the middle stage is higher than that in the early stage, and the speed increases more obviously with the increase of altitude. The development speed of streamer in the later stage is lower than that in the middle stage, but with the increase of altitude, the development speed of streamer in the later stage is higher than that in the middle stage.

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Study on Uniform Electric Field Air Streamer at Low Temperature and Subatmospheric Pressure

Cited by 3 publications

References 19 publications

Effects of rod radius and voltage on streamer discharge in a short air gap

Effects of rod radius and voltage on streamer discharge in a short air gap

Numerical simulation study on microdischarge via a unified fluid model

Study on discharge characteristics of low-temperature sub-atmospheric pressure under steep change rate voltage

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