Development and Reduction of n-Heptane Mechanism for Soot Model

According to the study of the soot emission in the combustion of diesel,a new reduced mechanism for n-Heptane was constructed to describe the combustion process in diesel engine by using sensitivity analysis.Furthermore,verifying the ignition delay time in combustion process by using CHEMKIN PRO in different pressure of 13.5 atm and 42 atm, initial temperatures of 600k and equivalence ratio of 0.5 and 1.0.Then,compare the simulated results with the experiment data, the mechanisms used in the simulation were Lawrence Livermore National Laboratory (LLNL) detail mechanism and the State Key Laboratory of Engine (SKLE) mechanism. It is demonstrated that the reduced mechanism can not describe the ignition delay time in low temperature.And then,the reduced mechanism was adjusted and optimized to make it more close to the experiment data,and the reduced mechanism were able to predict ignition delay time to some extent.The final reduced n-Heptane mechanism are more compact compare with the current detailed mechanisms in literature.Thus,this reduced n-Heptane mechanism can reduce the pressure of calculation and save the calculation time. And this reduced mechanism will using in the improved nine-step soot model for predicting soot formation and oxidation process in diesel engines by using Converge.