氮气介质阻挡放电激发态氮的数值模拟研究

Numerical Simulation of Excitation of Nitrogen in High-Pressure Dielectric Barrier Discharge

本文采用流体模型模拟了不同工作气体下N2介质阻挡放电。并利N2等离子体用发射光谱进行了实验对比。该模型考虑了10种反应物和28种反应。压力在1~5 atm之间,不同能级的N2(C)分子是典型的活性物质。模拟结果表明,在等离子体中,随着压力的增加,反应物N2(C)分子的数密度呈指数级下降。平均电子密度与压强的关系是复杂的,受中性粒子数密度和电子温度的影响。电子温度随压力范围的增大而降低。仿真结果可以描述等离子体参数的详细时空分布。由光谱计算得到的等离子体的平均电子温度、电子密度和N2(C)的激发趋势与模拟结果一致。

The fluid model was used to simulate the dielectric barrier discharge with N2 as the working gas under very high pressure. And an experiment was performed utilizing optical emission spectroscopy for comparison and verification. In this model,10 reactants and 28 reactions are considered. The pressure ranges from 1 atm to 5 atm,and the molecules N2(C)are considered as representative of reactive species. In the bulk of plasma,the simulation results indicate the relationship between the average electron density and the pressure is complicated and is affected by the density of neutral species and electron temperature. The results show that the densities of reactive species decrease exponentially with the increase of pressure. The electron temperature decreases with the rise of pressure. The simulation results can describe the detailed temporal and spatial distribution of plasma parameters.The tendencies of average electron temperature,the electron density,and excitation of nitrogen N2(C)of the bulk of plasma calculated from the spectrum agree with simulation results.