Evaluation, reduction, and validation of a new simplified mechanism for propane combustion in both air and oxy-fuel conditions

抄録

This study proposes a new 64-species, 793-step skeletal mechanism and a new 41-species, 73-step reduced mechanism for propane combustion in both air- and oxy-combustion conditions. First, through quantitative error evaluation against 10 sets of experiments (996 data points in total), we find CRECK2003-2020 performs best in overall predictions among 10 widely-used detailed mechanisms in both air- and oxy-combustion conditions. Then, by applying directed relation graph with error propagation (DRGEP), directed relation graph with error propagation-aided sensitivity analysis (DRGEPASA), quasi-steady-state approximation (QSSA), and computational singular perturbation (CSP) in order, CRECK2003-2020 is comprehensively reduced (including both skeletal and time-scale reduction) in a wide range of air- and oxy-fuel conditions. Finally, the skeletal and reduced mechanisms are thoroughly validated. Relative to the published mechanisms, this specially developed reduced mechanism can not only well predict the propane combustion in both air- and oxy-fuel conditions, but also has minimal species and reactions.