Global Journal of Engineering Science and Research Management NUMERICAL SIMULATION OF COMBUSTION CHARACTERISTICS OF METHANE FLAME IN AN AXISYMMETRIC COMBUSTOR MODEL
The present work is a numerical simulation of a non-premixed methane flame performed in a combustor model. CFD studies using ANSYS FLUENT were carried out changing the air swirl number, the inlet thermal load and the combustor exit diameter. The model geometry was created and meshing arrangement was generated using Gambit pre-processing software. To validate the computational procedure, comparison of the present calculations with the experimental data is plotted. Three cases; without radiation
... without radiation model, with the P-1 radiation model and with the discrete transfer radiation model were examined. The results from these three cases were compared with each other and with the experimental data. The discrete transfer and the P-1 radiation models were assessed in a swirling methane non-premixed flame confined in a combustor model. A comparison of realizable k-and standard k-turbulent models is presented. The effects of the inlet thermal load, air swirl number and changing the combustor exit diameter on flame characteristics were studied. The results have shown the significant effect of studied parameters on the flame characteristics and temperature patterns. Increasing the air swirl number and the combustor exit to swirler diameter ratio Dexit/Ds, leads to a decrease in the temperature levels and the flame length. Increasing the inlet thermal load, the high temperature region size, the flame length increased and the distributions of mass fraction for CO2 and O2 demonstrated similar trends with temperature, namely the higher the local temperature the stronger the main products formation.