A review of numerical approaches on decaying arc plasmas in polyatomic C-F-O molecular gas flow with chemical non-equilibrium considerations

Abstract

This study reviews two numerical models to simulate arc plasma decay in polyatomic molecular gas flows, focusing on chemically non-equilibrium (CNE) effects. The first model addresses C-F-O gas mixtures formed by CO2 with ablated PTFE vapor, incorporating 24 species and 98 reversible reactions with temperaturedependent rates. It predicts plasma composition and electron density during decay. The second model assumes irreversible C5F10O decomposition in CO2/O2 mixtures, validated by equilibrium analysis. Arc decay under free recovery is analyzed, highlighting the impact of reaction kinetics and gas composition on temperature and species evolution