Simulation of Effect of Discharge Voltage and Dielectric Material on Ionisation Characteristics of Methane Dielectric Blocking Discharge

doi:10.19596/j.cnki.1001-246x.8842

Abstract

Abstract:

In order to explore key technologies to improve the combustion of agricultural internal combustion engine, characteristics and influencing factors of methane plasma in the coaxial dielectric barrier discharge process are analyzed. A two-dimensional axisymmetric actuator model is established, and the discharge process is numerically simulated by finite element method. The changes of electron density, electron temperature, CH₃ and H number density under different voltage amplitudes and different dielectric materials are analyzed. The simulation results show that voltage amplitude affects the change of current, and the change of electron density and electron temperature are affected by the current. When the input voltage changes, the energy of ionized methane changes with the voltage, and when the voltage amplitude increases, the electron density and electron temperature increase. When the energy consumed by the collision between particles is greater than the energy released by ionization, Electron density and temperature decreased; The number density of CH₃ and H increases with time, and the higher the voltage amplitude, the faster the growth rate. The electron density and the electron temperature increase with the increase of the relative dielectric constant, and the number density of CH₃ and H increases with the increase of the relative dielectric constant. Increasing voltage amplitude and relative dielectric constant will further intensify the ionization of methane.

Key words: dielectric blocking discharge, CH₄, plasma, electron density, electron temperature, numerical simulation

Rui ZHANG, Lei CHEN, Wen ZENG, Yingxin JU, Nanyu LI, Peng SONG. Simulation of Effect of Discharge Voltage and Dielectric Material on Ionisation Characteristics of Methane Dielectric Blocking Discharge[J]. Chinese Journal of Computational Physics, 2025, 42(1): 47-56.

Figures/Tables 18

Fig.1 Modeling of coaxial dielectric barrier discharges

Fig.2 Simulation model

Table 1 Reaction mechanism of methane plasma

反应	反应表达式	反应系数
R01	e+CH₄→CH₄⁺+e	由碰撞截面计算
R02	e+CH₄→CH₄⁺+2e	由碰撞截面计算
R03	e+CH₄→CH₃⁺+H+2e	由碰撞截面计算
R04	e+CH₄→CH₃⁺+H+e	由碰撞截面计算
R05	e+CH₄→C+4H+e	由碰撞截面计算
R06	e+CH₄→CH+3H+e	由碰撞截面计算
R07	e+CH₃→CH+2H+e	由碰撞截面计算
R08	e+CH₃→CH₃⁺+2e	由碰撞截面计算
R09	e+CH₃→CH+2H+e	由碰撞截面计算
R10	CH₃⁺+CH₄→CH₄⁺+CH₃	1.36×10^-16
R11	H+CH₃→CH₄	7×10^-18
R12	CH₃⁺+CH₄→CH₄⁺+CH₃	1.36×10^-16
R13	H+CH₃→CH₂+H₂	1×10^-16 exp(-7 600/T_g)
R14	H+CH₄→CH₃+H₂	2.2×10^-26 T_g³exp(-4 045/T_g)
R15	CH₄⁺+H→CH₃+H₂	1×10^-17
R16	H⁺+CH₄→CH₄⁺+H	1.5×10^-15
R17	H⁺+CH₄→CH₃⁺+H₂	2.3×10^-15
R18	H⁺+CH₃→CH₃⁺+H	3.4×10^-15

Table 2 Surface reaction of CH4 plasma

编号	反应方程	附着系数	二次发射系数
1	CH₄⁺→CH₄	1	1×10^-6
2	CH₄⁺→CH₄	1	0.015

Fig.3 Variation of current with time at different voltages

Fig.4 Voltage-current characteristic of PTFE at 10 kV

Fig.5 Distribution of electric field during discharge and trends with time (a) 0 s; (b) 2×10-6 s; (c) 3.8×10-5 s; (d) 5.6×10-5 s; (e)8.1×10-5 s; (f) 1×10-4 s; (g) variation of electric field with time

Fig.6 Variation of electron density with time at different voltages

Fig.7 Variation of electron temperature with time at different voltages

Fig.8 Variation of the number density of CH3 with time at different voltages

Fig.9 Variation of the number density of H with time at different voltages

Table 3 Relative dielectric constants of different materials

编号	介质层材料	相对介电常数
1	聚四氟乙烯	2.3
2	二氧化硅	2.79
3	石英	4.3

Fig.10 Variation of current with time in different media

Fig.11 Voltage and current characteristics of quartz at 10 kV

Fig.12 Variation of electron density with time in different media

Fig.13 Variation of electron temperature with time in different media

Fig.14 Variation of number density of CH3 with time in different media

Fig.15 Variation of number density of H with time in different media

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