Numerical Simulation of Direct Current Glow Discharge in Air with Experimental Validation

He, Wei; Liu, Xinghua; Yang, Fan; Wang, Hongyu; Liao, Ruijin; Xiao, Hongshan

doi:10.1143/jjap.51.026001

Cited by 14 publications

(3 citation statements)

References 30 publications

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“…In the microscopic chemical reactions of plasma, the average energy density of electrons directly affects the reaction's rate and the energy transfer's rate when electrons collide with other particles [33]. In order to describe the generation and loss mechanism of electron energy in the corona discharge process, considering the influence of temperature, the electron energy conservation equation is shown in Equation (3):…”

Section: Governing Equations Of the Numerical Modelmentioning

confidence: 99%

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

Wang,

Mai,

Wang

2023

Applied Sciences

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For investigating the relationship between the surface corona discharge of a DC wire and other influencing factors, a hybrid numerical model based on a fluid-chemical reaction was proposed to simulate the discharge process at the tip defect of the wire. Under different defect geometries and gas pressures achieved via simulation, the microscopic process of the reaction and movement of electrons and heavy particles during a positive corona discharge was studied, and characteristic parameters such as corona inception voltage and discharge current were analyzed. Furthermore, through the corona cage test, for a specific electrode configuration, corona inception voltages under different pressures were compared and verified, which showed that the model was reasonable. The results showed that the maximum electron density of the streamer head was about 1 × 1020 m−3, the rise time of the pulse current was about 10 ns, and the decay time was about 300–500 ns. The corona inception voltage decreased with an increase in the tip height and decreases in the tip curvature radius, conductor radius, and background air pressure; the amplitude of the pulse current increased with increases in the wire radius and curvature radius of the defect tip and decreases in tip height and background air pressure. The experimental results are consistent with the simulation results, which verifies the reasonability of the model.

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Section: Governing Equations Of the Numerical Modelmentioning

confidence: 99%

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

Wang,

Mai,

Wang

2023

Applied Sciences

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“…The drift-diffusion process of the electron density n e and electron energy density n ε can be described as [18],…”

Section: Corona Discharge In Sf 6 /N 2 Mixturementioning

confidence: 99%

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Du¹,

Jin²,

Liang³

2019

Electric Power Conversion

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Many researchers have proposed a variety of mathematical models to simulate the surface charge accumulation process of DC-GIS/GIL spacers. However, few of them took the gas collision ionization and charge trapping-detrapping process into consideration. This chapter combined the plasma hydrodynamics and charge transport equations and built a modified model. Some conclusions are shown as follows: for the basin-type spacer, the surface charge has the same polarity as the applied voltage on the lower surface but the opposite polarity on the upper surface. For the disc-type spacer, the surface charge has the same polarity as the applied voltage near the shell but the opposite polarity near the conductor under negative voltage. But under positive voltage, negative charge exists almost on the whole surface. The most serious distortion of the electric field occurs at the triple junction of epoxy spacer. Under load condition, there is an obvious temperature rise on the conductor due to joule heating, which has a great influence on the electric field distribution. The application of shielding electrodes has the function of field grading at the triple junction, which can be referred in the DC GIS/GIL design.

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“…The reactions were selected based on the work of Soria et al [41], and the reaction rates were extracted using the LFA method. In addition to the transport equations, in [42,43], the electron energy conservation was also considered with the swarm parameters obtained by LEA method. Chen et al [33] examined different stages of the pulses in a coaxial cylindrical gap geometry by adopting a hydrodynamic model with 15 species and 83 reactions: 61 involving electrons and 22 ionion reactions.…”

Section: Introductionmentioning

confidence: 99%

Numerical approaches in simulating Trichel pulse characteristics in point-plane configuration

Shaygani

Adamiak

2023

J. Phys. D: Appl. Phys.

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In this work, a detailed comparison is made of a few different approaches to numerical modeling of non-equilibrium gas discharge plasmas in dry ambient air at atmospheric conditions, leading to Trichel pulse discharge. Simulation models are based on a two-dimensional axisymmetric finite element discretization of point-plane geometry. The negative corona discharge and the hydrodynamic approximation for generic ionic species (electrons, positive and negative ions) are used. The models account for the drift, diffusion, and reactions of the species. They comprise continuity equations coupled to Poisson’s equation for the electric field. Three different formulations were used to specify the ionic reaction rate coefficients. In the first one, the reaction coefficients are approximated by the analytical expressions as a function of the electric field intensity. Two others extract the reaction coefficients from the solution of the Boltzmann equation as a function of the reduced electric field or the electron energy. The effect of gas flow and heating on the pulse characteristics is also investigated. The accuracy of the models has been validated by comparing them with the experimental data.

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Numerical Simulation of Direct Current Glow Discharge in Air with Experimental Validation

Cited by 14 publications

References 30 publications

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

A Numerical Simulation Study on DC Positive Corona Discharge Characteristics at the Conductor’s Tip Defect

Electrical Field Distribution along HVDC GIL Spacer in SF 6 /N 2 Gaseous Mixture

Numerical approaches in simulating Trichel pulse characteristics in point-plane configuration

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