Development of a FPI Detailed Chemistry Tabulation Methodology for Internal Combustion Engines

Development of a FPI Detailed Chemistry Tabulation Methodology for Internal Combustion Engines - In this paper the FPI (Flame Prolongation of ILDM) approach for chemistry tabulation is applied to 3D internal combustion engine simulations. The first issue is to adapt the method to a fully compressible solver with a limited database size. Tabulation reduction could be a solution for reducing the database size but, for the present applications, the compositions together with local thermodynamic conditions are varying over very large ranges. Instead, we propose a novel formulation of the model based on the mass fraction balance equation of main species and on the tabulated chemical source term of the reaction progress variable. Then, the model is extended to engine problematics such as dilutant addition and complex fuels handling. The model is integrated in the IFP-C3D internal combustion engine solver and it is validated against complex chemistry calculations in constant and variable volume configurations. The model is finally successfully applied to the computation of Diesel engine operating point with spray injection.