The kinetic model of n-propylcyclohexane was studied by using the Hybrid Chemistry (HyChem) modeling method. The pyrolysis of the large fuel molecule to form small products was modeled by the seven-step lumped reaction

while the oxidation of the small products was described by the detailed reaction model USC Mech Ⅱ. The HyChem kinetic model of n-propylcyclohexane consisting of 112 species and 791 elementary reactions was constructed by coupling the two sub-mechanisms

and the experimental data of the flow reactor pyrolysis

ignition delay time and laminar flame speed were used to conduct the model validation. The results showed that this reaction mechanism can accurately predict the product distribution during the pyrolysis of n-propylcyclohexane

and it also had good performance in the prediction of the global combustion parameters

the calculation relative error of ignition delay time was 29.7%

and the calculation relative error of laminar flame speed was 11.1%.