有源等离子体在开放大气环境下的反应扩散过程研究

利用一维模型用数值模拟的方法,研究了低气压开放环境下大气等离子体在存在等离子体源的情况下的反应扩散过程.得到了考虑化学反应、扩散以及漂移共同作用下的大气等离子体的主要成分随等离子体注入流量的变化规律及一定流量情况下主要带电成分随时空的演化规律. 将数值模拟结果与一个近似解析公式相衔接,估计达到稳态时维持一定电子密度所需要的等离子体流量,可据此进一步估计所需功率. 关键词： 大气等离子体 等离子体源 数值模拟 反应扩散过程

Numerical simulation of reaction-diffusion process of air plasma with a plasma source in open atmospheric environment

A one-dimensional model is used to investigate the reaction-diffusion process of air plasma with a plasma source by numerical simulation in low pressure open atmospheric environment. The spatial evolutions of main charged species’ densities in the chemical reaction, drift and diffusion processes are obtained for a given plasma flow. The results of numerical simulation are combined with an approximate analytical formula to estimate the necessary plasma flow for electron density when a stable state is formed, with which the necessary power of the plasma source also can be estimated.