Corona discharge is a self-sustained discharge of gaseous medium in inhomogeneous electric fields, which often occurs on transmission lines and has some adverse effect on the power transmission system. In this paper, a kinetic model of corona discharges is presented to simulate the evolution process of charged particles and neutral species in humid air. To investigate the effect of humidity, our model consists of 69 species and 393 chemical reactions which consider important reactions containing H2O molecules and hydrates. In addition, CO2 molecules are also included to improve the integrity of reaction database. A temporal evolution of reduced electric field strengths E/N, which are typical experimental values of corona discharges, is used as input. The simulation results show that H3O+ is one of the dominant positive ions which is in qualitative agreement with previous experimental results. The effect of humidity and pulse width on the plasma chemistry is also discussed. It is found that the humidity affects the maximum density and life time of the specific species. Meanwhile, the plasma chemistry could be affected by different pulse widths of the input electric field.

中文翻译：

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潮湿空气中大气压电晕放电的动力学建模

电晕放电是气态介质在不均匀电场中的自持放电，常发生在输电线路上，对输电系统有一定的不利影响。在本文中，提出了电晕放电动力学模型来模拟带电粒子和中性物质在潮湿空气中的演化过程。为了研究湿度的影响，我们的模型由 69 个物种和 393 个化学反应组成，这些化学反应考虑了包含 H2O 分子和水合物的重要反应。此外，还包括 CO2 分子以提高反应数据库的完整性。减小的电场强度 E/N（电晕放电的典型实验值）的时间演变用作输入。模拟结果表明，H3O+ 是主要的正离子之一，与先前的实验结果定性一致。还讨论了湿度和脉冲宽度对等离子体化学的影响。研究发现，湿度会影响特定物种的最大密度和寿命。同时，等离子体化学会受到输入电场不同脉冲宽度的影响。