Calibration and Validation of Efficient Combustion and EmissionModels for 3D-CFD EngineSimulations

To accurately analyze combustion and emissions in the internal combustion engine, hundreds of chemical species have to be transported in the computational domain in the form of a detailed chemical mechanism. The use of this detailed chemical mechanism in the computational domain leads to an increase in computational time. To avoid this, there are two solutions proposed by the combustion research community, one is mechanism reduction, and the other is a tabulated chemistry approach. In the tabulation method, all the data is stored in a table according to the specified mechanism and then the table is accessed with the local cell values. In this study, a tabulated chemistry solver developed by LOGE called Combustion Progress Variable (CPV)was used. For this study, the CONVERGE CFD software was used as the testing platform.CONVERGE has an in-built detailed chemistry solver called SAGE which was used to validate the tabulated chemistry solver (CPV). The validation was done both for constant volume and a Diesel engine configuration. One of the constant volume configurations was a homogeneous model which was simulated at different initial temperatures to study the behavior of the different mechanisms. The other constant volume model was a Spray A model which was used to study spray characteristics like lift-off length, ignition delay time, and heat release rate with both the chemistry models. Finally, the Diesel engine simulations were carried out with both chemistry models and the data was validated by comparing cylinder pressure, heat release rate, and fuel behavior throughout the proces