Influence of number of laminar flamelets and their scalar dissipation rate on combustion characteristics in a gas turbine model combustor

The purpose of this paper is investigation of the influence of turbulent flame formation by using laminar Flamelet model on combustion characteristics in a gas turbine model combustor. The effect of number of laminar Flamelets and their scalar dissipation rate on reactive flow characteristics such as temperature, scalar dissipation rate of flame, concentration of species and NO emission are the results of this paper. In order to solve the governing equations of non-premixed combustion of Kerosene liquid fuel in a gas turbine model combustor, the Finite Volume method is employed. The Realizable k-ε turbulence model, steady Flamelet combustion model and chemical mechanism with 26 reduced reaction and 17 species are applied to simulate two-phase reacting flow in this combustor. This study is performed in three different Flamelet cases and their results are compared with available experimental data. The results show that the effect of laminar Flamelet numbers and the maximum scalar dissipation rate of flame on the velocity of flow is negligible. However, the flame temperature is affected from these parameters. In the case that the flame consists of greater laminar Flamelets numbers and the maximum scalar dissipation rate, less difference between simulation and experimental temperature is observed. By reducing the laminar Flamelets numbers and the maximum scalar dissipation rate, the stretch of flame is reduced, higher temperature and higher NO emission are predicted.