Verification and analysis of flowing gas discharge – Part II

Kang, Yongqiang; Wu, Guangning; Zhang, Xueqin; Liu, Yijie; Shi, Chen; Wei, Wenfu; Gao, Guoqiang

doi:10.1109/tdei.2019.007833

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…e calculation results are consistent with the experimental results of our previous articles [27,28]. When the charging coefficient f, gap distance d, and parameter m (that can represent sand concentration) remain unchanged, the breakdown voltage increases with the decrease of sand particle size R. For example, when R � 50 μm, the breakdown voltage is about 22 kV/cm at the airflow speed v � 30 m/s, while when R is 100 μm, 150 μm, and 200 μm, the breakdown voltage is about 17 kV/cm, 15 kV/cm, and 11 kV/cm, respectively, at the same airflow speed, which is, respectively, about 77%, 68%, and 50% of the breakdown voltage value at R � 50 μm.…”

Section: Simulation and Discussionsupporting

confidence: 91%

“…From equation (28), we can find that α, α 1 , and α 2 satisfy α � (α 1 + α 2 ) , and α i , α i1 , and α i2 satisfy α i � (α i1 + α i2 ), which can be further simplified as…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…In this regard, Ye et al [24][25][26] have proposed the calculation methods of local electric field in the mixture such as dipoleenhanced model and displaced dipole model and presented a dielectric breakdown model for static gas-solid two-phase mixture, but the model did not consider the influence of airflow on discharge. Kang et al [27][28][29] found that the flowing gases have a significant impact on the discharge process. e frequent collision between gas molecules and electrons or ions causes the change of discharge path and space charge, and the gas discharge model in the flowing gases environment was established.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Strong Wind-Sand Dielectric Streamer Discharge

Kang

Shi

2022

Mathematical Problems in Engineering

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Due to the complex and harsh climate environment in Northwest China, the external insulation of power lines and high-speed train are exposed to strong wind-sand environment all year round, which brings severe challenges to the external insulation design and protection of the electric systems. Based on the theories of streamer discharge, the plate-plate electrode was taken as the analysis object, and a theoretical physical model of the strong wind-sand dielectric discharge is established. In this model, the analytical expressions of electron ionization coefficient and positive ion generation coefficient in a wind-sand environment are deduced considering the combined effects of the airflow velocity, the distortion of the electric field caused by sand particles, and the electrons captured by sand particles in the discharge process; furthermore, the streamer breakdown criterion in wind-sand environment is proposed. Research results can provide an important theoretical basis for the quantitative calculation of the breakdown voltage and the external insulation protection in a strong wind-sand environment.

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Section: Simulation and Discussionsupporting

confidence: 91%

“…From equation (28), we can find that α, α 1 , and α 2 satisfy α � (α 1 + α 2 ) , and α i , α i1 , and α i2 satisfy α i � (α i1 + α i2 ), which can be further simplified as…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of Strong Wind-Sand Dielectric Streamer Discharge

Kang

Shi

2022

Mathematical Problems in Engineering

Self Cite

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“…According to literature [26][27][28], the selection of discharge parameters of dry air and air containing solid particles are shown in Table 2 α d represents the collision ionisation coefficient of dry clean air and η d represents the electron adhesion coefficient of dry clean air.…”

Section: Selection Of Discharge Parametersmentioning

confidence: 99%

“…Due to the limitation of experimental conditions and detection techniques, it is difficult to obtain the parameters such as electron density and electric field intensity in the discharge process, so the experimental phenomena and experimental results cannot be explained well. Recently, with the development of computer technology, it is possible to obtain the parameters which are difficult to obtain in discharge process by simulation [26][27][28]. The combination of experiment and simulation becomes an ideal way to study the discharge characteristics of unclean air.…”

Section: Introductionmentioning

confidence: 99%

Effect of solid particle type, concentration and size on DC breakdown voltage of short needle‐plate air gap: An experiment and simulation study

et al. 2022

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Unclean air discharge refers to the discharge phenomenon of a large number of polluting gases, droplets or solid particles floating in the air, which will cause insulation breakdown and safety accidents for the power transmission equipment that have been left outdoors for a long time. In order to investigate the effects of particle concentration, particle size and dielectric constant on DC breakdown characteristics of unclean air gap, a self‐made discharge chamber was designed in this study. The air was filtered and passed into the discharge chamber to remove the influence of impurities contained in the air on the experimental results. Then, solid particles with different concentration, particle size and particle dielectric constant were added to the discharge chamber to carry out the DC positive polarity breakdown characteristic experiment. The experimental results show that compared with dry clean air, the presence of solid particle increases the breakdown voltage of the gap, and the increase proportion of breakdown voltage is related to the particle concentration, particle size and particle dielectric constant. With the same particle type and particle size, the increase proportion of breakdown voltage increases with the higher concentration, which up to 10.49%. For further investigating, the fluid mechanics model was selected to simulate the process of streamer discharge in unclean air. The results show that compared with dry clean air, the presence of particles enhances the gap discharge ionisation process, but also enhances the adsorption of particles, and the latter has stronger effect than the former, thus increases the gap breakdown voltage. At the same time, the enhancement of adsorption effect increases the electric field intensity of the gap and speeds up the development process of streamer discharge.

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Effect of transverse airflow on the deflection of negative corona discharge on the Trichel pulse mode at atmospheric pressure

Guo

Zhang

et al. 2021

AIP Advances

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Negative corona discharge can deflect in transverse airflow in pin-to-plane electrodes at atmospheric pressure. In this paper, we investigate the mechanism of Trichel pulse discharge deflection in transverse airflow and give a further understanding of the dynamic process of the deflection through experiments and simulations. In experiments, we quantitatively record the deflection angle by processing the discharge images, and they show that a larger airflow speed will lead to a larger deflection angle. In simulations, the discharge deflection angle is calculated through a 2D fluid model. Besides, the periodic fluctuation of the deflection angle with Trichel pulses is revealed, and this phenomenon can be explained by the alternative dominant effect of airflow or ionization on the net production of positive ions in the vicinity of the tip. When the effect of airflow is dominant, more positive ions will generate away from the center of the tip, which will lead to an increase in the deflection angle. On the other hand, when the effect of ionization prevails, more positive ions will generate near the center because the electric field here is stronger, and the deflection angle will decrease. In addition, if these two effects balance, the deflection angle will reach its maximum or minimum value.

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Verification and analysis of flowing gas discharge – Part II

Cited by 12 publications

References 3 publications

Modeling of Strong Wind-Sand Dielectric Streamer Discharge

Modeling of Strong Wind-Sand Dielectric Streamer Discharge

Effect of solid particle type, concentration and size on DC breakdown voltage of short needle‐plate air gap: An experiment and simulation study

Effect of transverse airflow on the deflection of negative corona discharge on the Trichel pulse mode at atmospheric pressure

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