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In order to study the impact of CO 2  during n-heptane ignition delay under O 2 /CO 2  conditions, this study presents a numerical and experimental study in four cases (40 mol.% O 2 /60 mol.% CO 2 , 50 mol.% O 2 /50 mol.% CO 2 , 57 mol.% O 2 /43 mol.% CO 2  and 65 mol.% O 2 /35 mol.% CO 2 ). Firstly, a third body effect (TBE) model is presented, which considers the third body efficiency of CO 2 . Secondly, the TBE model adds the third body efficiency into a one-step global mechanism and obtains an ignition delay time formula according to the auto-ignition theory. Thirdly, experiments are carried out in a constant volume combustion chamber (CVCC) test system. Furthermore, the experiment and simulation results are compared and discussed. In addition, two parameters (α and β) are defined to study the third body effect and the chemical effect of CO 2  respectively. Finally, chemical kinetic analyses are used to study the CO 2  effect. The results show that the TBE model is in agreement with the experiment and the maximum difference is 8.94% under the 57 mol.% O 2 /43 mol.% CO 2  condition. The third body effect is the main effect of CO 2  and it can decrease small molecule intermediates and radicals. Besides, C 3 H 6 O is the most affected species by the third body effect of CO 2  among four prominent intermediate species. Furthermore, the third body effect of CO 2  inhibits most paths of OH production. H+ O 2 →O+ OH (R11) is the most affected pathway whose peak rate of production (ROP) decreases by 51.5%.

The Third Body Effect of Carbon Dioxide on N-heptane Ignition Delay Characteristics under O 2 /CO 2 Conditions