Numerical prediction of flow characteristics of confined turbulent premixed flame

A two-dimensional numerical model is developed to predict the transverse velocity, the concentrations of reactants and CO2, and the reaction rate of confined turbulent premixed flames. The model is applied to a CH4-air mixture at 600 K which is ignited and yields burnt products entering the combustion chamber at 2000 K at twice the velocity of the stream around them. The two streams mix in a test section. Partial differential equations are defined for the mean velocity, fuel mass fraction, O2 mass fraction, products mass fraction, the conserved properties, the enthalpy, etc. Finite difference equations are used to discretize the flow and the partial differential equations are integrated over the control volume. An eddy break-up model is configured for the reaction rate in the reaction zone of turbulent flames. The predicted and observed velocity fields were found to match well, while discrepancies were present in the concentration field.