The role of photoionization in negative corona discharge

Lu, Binxian; Sun, Hongyu

doi:10.1063/1.4963077

Cited by 27 publications

(11 citation statements)

References 38 publications

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“…Considering that the pulse electrical stress applied in this paper is negative polarity, the value α e of is 1 at the bar electrode and − 1 at the needle electrode; the third term is the electron quantity and energy gain caused by secondary electron emission, where γ is the second electron emission coefficient and ɛ is the average energy of second electrons. Based on pure air gap discharge simulation [28], the cathode secondary electron emission coefficient is set to 0.004. According to description of secondary electron from material surface reference DBD simulation [11], secondary electron emission of PI surface is set to 0.5; the average energy of secondary electrons ɛ = 2.5 eV [29].…”

Section: Numerical Model For Surface Dischargementioning

confidence: 99%

Finite‐element analysis for surface discharge on polyimide insulation in air at atmospheric pressure under pulsed electrical stress

Dong

Liu

et al. 2020

High Voltage

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A surface discharge non-equilibrium plasma model of air-polyimide under pulsed electrical stress is established, by considering the reaction of charged particles on the dielectric surface and the secondary electron emission caused by the condition that high-energy particles bombard the material surface. The model defines the chemical reaction of air discharge by using simplified set of reactions, which greatly reduces the complexity of the model. To avoid the negative value of particle density in the process of solution, the logarithmic finite-element method is used to solve the model established, so as to implement the dynamic simulation of the surface discharge process. Also, the temporal and spatial evolution of the microparameters such as charge and electric field distribution during discharge are obtained, and the reliability of the model is verified by experiments in terms of discharge development pattern and surface charge accumulation. By comparing the development process of surface discharge under single pulse and repetitive pulses, it can be seen that surface discharge develops from needle electrode to ground electrode under both repetitive pulses and single pulse stress, but the relationship between the discharge propagation time under repetitive pulses and pulse repetition rate is a 'u' curve, and the inflection point moves to higher repetition rate region with the increase of voltage.

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Section: Numerical Model For Surface Dischargementioning

confidence: 99%

Finite‐element analysis for surface discharge on polyimide insulation in air at atmospheric pressure under pulsed electrical stress

Dong

Liu

et al. 2020

High Voltage

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“…The simulation domain and boundary conditions of hyperboloid electrode are shown in our former manuscript. 25 Here is not given again. The simulation domain and boundary conditions of a Electronic mail: lbx@ncepu.edu.cn.…”

Section: A Physical Modelmentioning

confidence: 99%

“…The continuity equations coupled with Poisson equation are used to solve the transport process of atmospheric plasma. Photoionization has little influence on the issue discussed, 20,25 so in order to reduce computation cost, photoionization is ignored in this study. The governing equations are expressed as follows:…”

Section: B Governing Equationsmentioning

confidence: 99%

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Zhu

2018

AIP Advances

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Electrostatic precipitators based on corona discharge are a research hotspot in recent years. It is of great significance to investigate the characteristics of corona discharge under different system parameters for improving the dust removal efficiency. In this manuscript, the continuity equations coupled with Poisson’s equation are solved by the finite element method (FEM) to explore the different mechanisms of the generation of Trichel pulses when hyperboloid and hemispherical electrodes are used in negative corona discharges for a needle-plate configuration under atmospheric pressure. The fitting curve of the Trichel pulse frequency versus systematic macro parameters, including the applied voltage, the needle tip radius and the needle-plate distance, are given and their mechanisms are analyzed. Subsequently, the features of the Trichel pulses of the hyperboloid electrode and the hemispherical electrode at similar power are compared. From precipitation point of view, the hemispherical electrode is obviously better than hyperboloid electrode.

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“…The critical condition for the boundary of the two regions is that the value of ionization coefficient equals to the attachment coefficient (α=η). 1,25,26 The ionization coefficient and attachment coefficient are determined by electric field between the electrodes.…”

Section: A Qualitative Explanation For the Sound Pressure Generationmentioning

confidence: 99%

Propagation characteristics of audible noise generated by single corona source under positive DC voltage

Cui

et al. 2017

AIP Advances

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The directivity and lateral profile of corona-generated audible noise (AN) from a single corona source are measured through experiments carried out in the semi-anechoic laboratory. The experimental results show that the waveform of corona-generated AN consists of a series of random sound pressure pulses whose pulse amplitudes decrease with the increase of measurement distance. A single corona source can be regarded as a non-directional AN source, and the A-weighted SPL (sound pressure level) decreases 6 dB(A) as doubling the measurement distance. Then, qualitative explanations for the rationality of treating the single corona source as a point source are given on the basis of the Ingard’s theory for sound generation in corona discharge. Furthermore, we take into consideration of the ground reflection and the air attenuation to reconstruct the propagation features of AN from the single corona source. The calculated results agree with the measurement well, which validates the propagation model. Finally, the influence of the ground reflection on the SPL is presented in the paper.

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The role of photoionization in negative corona discharge

Cited by 27 publications

References 38 publications

Finite‐element analysis for surface discharge on polyimide insulation in air at atmospheric pressure under pulsed electrical stress

Finite‐element analysis for surface discharge on polyimide insulation in air at atmospheric pressure under pulsed electrical stress

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Propagation characteristics of audible noise generated by single corona source under positive DC voltage

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