Accurate and properly validated turbulence-chemistry interaction models for RANS combustion computational fluid dynamics (CCFD) simulations are required in support of the development process of modern gas turbine combustors. Although standard models are available for fully premixed and purely non premixed turbulent combustion, models describing partially pre-mixed combustion are still under development. A new model for the simulation of turbulent partially premixed combustion is presented, which combines features of non premixed and fully pre-mixed combustion models and reduces to these respective standard models in the limiting cases. Transport equations for mixture fraction and its variance as well as one progress variable are solved. Fluctuations of mixture fraction are taken into account through a presumed beta PDF assumption. The laminar flame speed for the whole range of mixture fractions is evaluated using correlations for lean and rich extinction limits based on experimental results from the literature. The model is validated using hydrogen and methane jet flames.
Investigation of the Prediction Performance of Turbulence and Combustion Models for the Turbulent Partially-premixed Jet Flame
