Numerical analysis of combustion performance in an annular combustor with two-stage swirler

In an arbitrary curvilinear coordinate system, a multidimensional empirical analysis methodology was developed to calculate the combustion performance of an annular combustor, which consists of the dump diffuser, two-stage flame tube and cooling passages.The RNG k-ε turbulent model was also modified, for enabling correct calculations of three-dimensional and two-phase turbulent reactive flows under a non-staggered grid system.Spray combustion was simulated through EBU-Arrhenius turbulent combustion model, six-flux radiation model and particle trajectory model.And numerical analysis was conducted for the effects of the geometry of swirlers on entire combustor flow fields and combustion performances.Predictions and measurements were in satisfactory agreement, and it was shown that numerical procedures are fairly reasonable and reliable for estimating the combustion performances of annular combustors.