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本文基于PASSKEy构建了一个多层介质球的二氧化碳填充式介质阻挡放电二维模型，对此模型的流注传播演化动态过程进行了深入系统的仿真研究。研究指出第一层和第二层介质球的内侧不是二氧化碳解离等反应发生的主要区域，主要区域为流注传播路径以及第一层介质球的外侧。同时，本文还对此模型的电子密度与电场的演化进行了深入解析，并给出了相应的物理机理和对应特征点的局部电场演化。此外，本文还分别研究了空间电荷和表面电荷的时空演化，指出整体上空间中的负电荷随着流注的形成和传播，不断收缩于流注内部和介质表面，而正电荷主导放电空间的电荷分布。并且通过展开特定介质球的表面，给出了具体的分布角度范围和演变趋势。最后本文还研究了一氧化碳粒子和二氧化碳离子和氧气离子的时空演化机理，并且对放电空间中所有的电子和二氧化碳离子的空间能量沉积进行了积分，数据表明在此模型中的总能量沉积值约为1.428 mJ/m，二氧化碳离子的沉积能量约为0.1251 mJ/m，占比达8.8%。This article presents a comprehensive study on the streamer propagation and electric field distribution within a two-dimensional fluid model of a packed bed reactor (PBR) filled with carbon dioxide, utilizing the PASSKEy simulation platform. The research delves into the spatiotemporal evolution of electron density, electric fields and key plasma species in the discharge process. The model simulates a PBR with layered dielectric spheres, indicates that the inner sides of the first and second layers of dielectric spheres are not the primary regions for reactions such as CO2 dissociation; instead, the main regions are along the streamer propagation path and the outer side of the first layer of dielectric spheres. The study by examining the propagation of streamers in the presence of an electric field, highlighting the influence of anode voltage rise and dielectric polarization on local electric field enhancement. This enhancement leads to increased electron density and temperature, facilitating streamer propagation and the formation of filamentary microdischarges and surface ionization waves. The article provides a detailed analysis of the local electric field evolution at specific points within the PBR. The research further investigates the spatiotemporal dynamics of spatial and surface charges, revealing that negative charges concentrate within the streamer and on the dielectric surface, with densities significantly higher than positive charges. The positive charges' distribution is closely related to the streamer's path, and over time, they come to dominate the charge distribution in the discharge space. The study also explores the surface charge deposition on the dielectric spheres, discusses the evolution trends of the distribution. Additionally, the article discusses the temporal and spatial evolution of key plasma species, including ions and radicals, and their contribution to the overall discharge characteristics. The production mechanisms of carbon monoxide particles, carbon dioxide ions, and oxygen ions are analyzed, with a focus on their spatial distribution and correlation with electron density. The study concludes with an examination of the energy deposition within the PBR, integrating the spatial energy deposition of electrons and major positive ions. The results indicate a total energy deposition value of approximately 1.428 mJ/m, with carbon dioxide ions accounting for 8.8% of this value.
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Keywords:
- Packed-bed dielectric barrier discharge /
- Dissociation of carbon dioxide /
- Numerical simulation of plasma /
- Reaction mechanism
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