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A Non-Adiabatic Flamelet Approach for Non-Premixed O2-CH4 Combustion

Numerical simulations of turbulent reactive flows are challenging due to the stiffness of chemical rate equations, depending on the number of species, reactions and time scales involved. A possible solution to speed-up the calculations is the use of tabulated manifolds for the thermo-chemical properties of the flame. In order to capture the effects of the flame-wall interactions, the pre-processed library shall include a parameter which accounts for heat losses. The generation of a non-adiabatic flamelet manifold is presented in this work, where the enthalpy defect experienced in proximity of the wall is included in the flamelet generation. A laminar simulation of a non-premixed methane/oxygen flame at elevated pressure is run to validate the manifold. The main differences to the frozen chemistry tabulation method previously in use are then underlined and referred to a finite rate chemistry case. Finally, a first assessment of the models was performed, based on a single-injector rocket chamber test case. The wall heat flux is compared with the available experimental results.