Probability density function computations of a strongly swirling flame

The present work is about the investigation of non-premixed combustion when primary air is introduced with swirl. CFD modeling of combustion of methane is accomplished using a Navier-Stoke solver. For turbulence modeling, k-epsilon realizable model is used. Axial and tangential velocities of air and combustion products are calculated at different axial locations to compare with experimental results. The comparison showed a good agreement with experimental data. [1]. Moreover variation of flame length is also studied at different geometrical swirl numbers for primary air introduced. Swirl number is varied by varying tangential velocity of primary air introduced through the annulus region. It was observed that flame length is reduced gradually by increasing the swirl number and improves stability of flame.