MODIFIED BIODIESEL CHEMICAL KINETICS BASED ON NUMERICAL SIMULATION IN AN IGNITION QUALITY TESTER

摘要

Numerical methods are becoming a key factor in the development of combustion chemical kinetic mechanisms. However, limited applicability of CFD for detailed chemistry invoked reliance on volume independent simulations for mechanism validations. In the present study, a five-component biodiesel mechanism is constructed by adding five irreversible reaction steps to a surrogate mechanism. Tuning of the Arrhenius kinetics constants is achieved by CFD simulations of the combustion process in an ignition quality tester (IQT) to predict accurate values of Cetane numbers (CN). Physical properties relevant to the spray, atomization and vaporization processes are predicted for the five biodiesel components. The validation is conducted through the comparison to a recent engine experiment. CFD simulations are carried out using the CFD software, FORTE, with dynamic cell clustering for detailed chemistry simulations.