TY - JOUR
TI - Numerical study of flame structure in the mild combustion regime
AU - Mardani Amir
AU - Tabejamaat Sadegh
JN - Thermal Science
PY - 2015
VL - 19
IS - 1
SP - 21
EP - 34
PT - Article
AB - In this paper, turbulent non-premixed CH4+H2 jet flame issuing into a hot and  diluted co-flow air is studied numerically. This flame is under condition of  the moderate or intense low-oxygen dilution (MILD) combustion regime and  related to published experimental data. The modelling is carried out using  the EDC model to describe turbulence-chemistry interaction. The DRM-22  reduced mechanism and the GRI2.11 full mechanism are used to represent the  chemical reactions of H2/methane jet flame. The flame structure for various  O2 levels and jet Reynolds numbers are investigated. The results show that  the flame entrainment increases by a decrease in O2 concentration at air side  or jet Reynolds number. Local extinction is seen in the upstream and close to  the fuel injection nozzle at the shear layer. It leads to the higher flame  entertainment in MILD regime. The turbulence kinetic energy decay at centre  line of jet decreases by an increase in O2 concentration at hot Co-flow.  Also, increase in jet Reynolds or O2 level increases the mixing rate and rate  of reactions.