Large eddy simulation of pollution formation in model annular combustor

In three-dimensional arbitrary curvilinear coordinates,large-eddy simulation(LES) approach was employed to simulate pollution formations in the model annular combustor.The k-equation subgrid scale model was used to simulate the subgrid eddy viscosity,the eddy-break-up(EBU) combustion subgrid scale model was applied to prediction of the chemical reaction rate,the NOsubgrid scale pollutant formation model was employed to the evaluation of the rate of NOformation,and a two-step turbulent combustion subgrid scale model was applied for calculating COconcentration.Astochastic separated flow formulation was applied to prediction of instantaneous gas-liquid two-phase turbulent combustion flows.The numerical simulation results were in reasonable agreement with the experimental instantaneous velocity profiles in the primary zone,temperature and pollution concentration profiles at the outlet.It shows that the LESmethod and subgrid scale pollution formation models in this study can be used to investigate turbulent two-phase combustion and pollution formation processes in combustors.