介质阻挡放电等离子体中的电子碰撞能量转换过程

Electron Collision Energy Conversion Processes in Dielectric Barrier Discharge Plasma

通过计算建立的介质阻挡放电等离子体动力学模型,分析了等离子体中电子碰撞过程中的电子能量转换过程,为掌握等离子体强化燃烧机理奠定基础。结果表明:介质阻挡放电等离子体中的电子能量分布函数主要受约化场强的影响;随着约化场强的变化,电子能量损失于不同碰撞类型的比例不同,且在实验中常用的100～300 Td之间,电子能量主要损失于和N_2、O_2分子间的电子激发态碰撞和离解碰撞过程;对于空气和化学恰当比混合的空气/甲烷混合气介质阻挡放电,在放电结束后约1ms时,分别有约50%和126%的放电能量用于加热气体。

The electron energy conversion processes were analyzed through calculating the established dielectric barrier discharge kinetic model, and the foundation was laid for grasping the mechanism of plasma assisted combustion. The results showed that the electron energy distribution function of dielectric barrier discharge plasma was mainly affected by the reduced field. With the change of the reduced field, electron energy loss in the proportion of different collisions types was different, and electron energy was primarily lost in the excited and dissociated collisions with N2 and O2 moleculars with the commonly used reduced field which between 100 Td to 300 Td. For air and stoichiometric mixture of air and methane dielectric barrier discharge, about 50% and 126% of the discharge energy was used to heat the gas respectively after the discharge about 1ms.