Numerical Modeling of Impact Effect of Chemical Reactions on Nitrogen Oxide Conversion in N₂/O₂ Mixtures Under Various X%O₂ Concentrations

Abstract

The main objective of this study is to understand the influence of various chemical reactions that participate in NO creation or reduction in N2/O2 mixed gas induced by negative corona discharge under different X%O2 concentrations in the ranges 5%–25% in the N2/O2 mixture. The fundamental chemistry governing NO evolution developed in this article is based on a full set of processes regrouped in 150 selected chemical reactions involving 25 molecular, excited, atomic, and charged species. The density was calculated using the continuity equation without the diffusion and convective terms, beneath different values of electric reduced fields within the vary of 50–90 Td, at various times in the ranges 10−9–10−4 s. The results of our numerical simulations show the role played by different chemical reactions on NO production and reduction, such as $\mathrm {N(^{2}D)\,+\,O_{2}\,\rightarrow \, NO + O}$ and $\mathrm { NO\,+\,O+ N_{2}\,\rightarrow \, NO_{2}\,+ N_{2}}$ , respectively. We have found that, at 50 and 70 Td, nitrogen oxide creation dominates when O2 concentration equals 5%, while, for 90 Td, creation dominates when X%O2 concentration equals 10%. These results are the same for both reactions.