An investigation on a new reduced chemical kinetic model of n-heptane for HCCI combustion

Detailed chemical kinetic calculations coupled with computational fluid dynamics simulations of chemically reacting flows are still unrealistic as the basis for a parametric simulation tool because they require a long central processing unit time. In this paper, a new reduced model of n-heptane has been developed on the basis of detailed mechanism by sensitivity analysis and oxidation path analysis in homogeneous charge compression ignition (HCCI) combustion. The new reduced mechanism consists of 35 species and 41 reactions, and it is effective in simulating HCCI engine combustion process. The results show that it gives predictions similar to the detailed model in ignition timing, in-cylinder temperature, and pressure. Furthermore, the reduced mechanism can be used to simulate the boundary conditions of partial combustion in good agreement with the detailed mechanism.