Modeling and 3D-Simulation of the Kinetic Effects in the Post-Flame Region of Turbulent Premixed Flames Based on the G-Equation Approach

In order to simulate the premixed turbulent flame and to study the thermodynamical and chemical state in the post flame region we integrate a number of appropriate submodels in a complete model. The flame front position is described as an iso-surface of a field variable G, and chemistry and turbulence-chemistry interaction models are conditioned on the flame front position following the conditioned progress variable approach (CPVA). Three special features of the model have been addressed to clarify following questions: (1) Is it really necessary to apply the conditioned progress variable approach, or is the ILDM based on the multivariate presumed PDF alone able to predict the flame behavior with reasonable accuracy? (2) Is the CPVA based on ILDM notedly advantageous compared to that based on the chemistry equilibrium? (3) How noticeable is the influence of some model parameters for the description of the flame brush thickness on the prediction of species concentration in the postflame region? For this purpose, some simulation results are presented and compared with experimental data of a turbulent premixed flame, the so-called “F2” case experimentally investigated by Chen et al. [Combust. Flame107 (1996) 223–224]. Comparison results with different model combinations along with equilibrium chemistry consideration reveal that the CPVA based on ILDM achieved better agreement with experimental data provided suitable value for the model parameter is used.

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