棒-板电极直流负电晕放电脉冲过程中子特性研究

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Abstract In order to explore the characteristics of electron in DC negative corona discharge, microscopic process of negative corona discharge in air is simulated in this paper. The numerical computation is established with a bar-plate electrode configuration with an inter-electrode gap of 3.3 mm, the negative DC voltage applied to the bar is 5.0 kV, the pressure in air discharge is fixed at 1.0 atm, and the gas temperature is assumed to be a constant(300K). And the solution of the microscopic mechanism for corona discharge is to convert the electron conservation equation, electron mean energy conservation, heavy species multi-component diffusion transport equation, and the Poisson’s equation into the appropriate system of partial differential equations, which are then normalized and solved using discrete numerical difference equations. Using individual discharge current waveform, the effectiveness of this developed model is validated by experimental results. Based on this simulation model, characteristics of electrons at 6 representative time points during a pulse are discussed emphatically. The obtained results show that, the maximum number of electron temperature appears in field ionization layer which moves towards the anode as time progresses, and its value decreases gradually. Within a pulse process, the electron density in the cathode sheath region almost keeps zero, however, it increase sharply to its maximum value at the cathode sheath outer layer. The electron density distribution move towards the anode, and the density of space increase gradually with time progresses. Among all reactions, R₁ and R₂ which are electron collision reaction associated respectively with N₂ and O₂ regarded as the main process of electron proliferation, besides, reaction rates of R₁ and R₂ almost keep the same curve. R₁₇ is a recombination reaction of N₂, N₂⁺ and e, which play a dominant role in the dissipation process of electron. The obtained results will provide valuable insights to the physical mechanism of negative corona discharge in air. The obtained results will provide valuable insights into the physical mechanism of positive corona discharge in air.

Key words： Negative corona discharge numerical simulation electron temperature electron density generation and dissipation performances

Received: 22 January 2014 Published: 29 June 2015

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TM835

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	Liao Ruijin
	Wu Feifei
	Liu Kanglin
	Wang Ke
	Gao Jun
	Zuo Zhiping

Cite this article:

Liao Ruijin,Wu Feifei,Liu Kanglin等. Simulation of Characteristics of Electrons During a Pulse Cycle in Bar-Plate DC Negative Corona Discharge[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 319-329.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I10/319

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