In most of the modern day lean gas turbine combustors, the flame is stabilized by swirl flows. A central toroidal recirculation zone (CTRZ), developed by these swirl flows, helps in stabilizing the flame. Current study is focused on the effects of swirl number and a central rod in non-reacting and reacting flows of a lean premixed swirl stabilized combustor. Turbulence is modelled using realizable k - ∈ model of RANS and combustion is modeled using flamelet generated manifold (FGM) technique. The numerical model is validated with the experiments and large eddy simulation (LES). The results are comparable with experiments and LES. Higher velocities are observed with the increase in the swirl number. Also, the CTRZ moved upstream along with the flame, creating a flashback. Turbulent kinetic energy (TKE) increases with increase in the swirl number. Higher turbulence is observed in shear layers, especially inner shear layer. NO_x emissions are higher in the regions of high temperature, especially in the CTRZ. These emissions decrease with the increase in the swirl intensities.
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