Results of a detailed numerical simulation of an n-heptane/air edge flame are presented. The equations of the low-Mach number approximation are solved in a two-dimensional domain using detailed models for species transport and chemical reactions. The reaction mechanism involves 560 species and 2536 reversible reactions. We consider an edge flame that is established in a mixing layer for a uniform velocity field. The mixing layer spans the equivalence ratios between pure air and 3.5. The detailed model enables us to analyze the chemical structure of the edge flame. We identify major species profiles, identify reactions causing the heat release, and discuss the main fuel-consumption pathways. This analysis is performed for several regions in the edge flame to discuss the different processes at work in the premixed branches and the trailing diffusion flame. Finally, we analyze the accuracy of two skeletal mechanisms which were previously developed from homogeneous ignition calculations and show that a significant reduction in size of the mechanism can be achieved without a significant decrease in accuracy.
Detailed numerical simulation of a n-heptane edge flame / Prager, J.; Najm, H. N.; Valorani, M.; Goussis, D. A.. - 2:(2009), pp. 1005-1012. (Intervento presentato al convegno Fall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 tenutosi a Irvine, USA).
Detailed numerical simulation of a n-heptane edge flame
Valorani M.;
2009
Abstract
Results of a detailed numerical simulation of an n-heptane/air edge flame are presented. The equations of the low-Mach number approximation are solved in a two-dimensional domain using detailed models for species transport and chemical reactions. The reaction mechanism involves 560 species and 2536 reversible reactions. We consider an edge flame that is established in a mixing layer for a uniform velocity field. The mixing layer spans the equivalence ratios between pure air and 3.5. The detailed model enables us to analyze the chemical structure of the edge flame. We identify major species profiles, identify reactions causing the heat release, and discuss the main fuel-consumption pathways. This analysis is performed for several regions in the edge flame to discuss the different processes at work in the premixed branches and the trailing diffusion flame. Finally, we analyze the accuracy of two skeletal mechanisms which were previously developed from homogeneous ignition calculations and show that a significant reduction in size of the mechanism can be achieved without a significant decrease in accuracy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
