Construction of a Chemical Kinetic Mechanism of Five-Component Surrogate Fuel for RP-3 Kerosene

RP-3 is the most widely used aviation kerosene in China. Studying its chemical kinetic model is of great significance for analyzing its combustion characteristics and emissions. This paper proposes a new five-component RP-3 surrogate fuel mixture model. The three low-temperature oxidation reaction pathways of 1,3,5-trimethylbenzene were determined using the Rate of Production (ROP) analysis method, and a simplified mechanism containing 22 species and 69 elementary reactions was constructed. The reaction mechanisms of each component were simplified and coupled with the decoupling method, and the kinetic parameters of the coupled mechanism were corrected with the temperature sensitivity analysis method, obtaining a five-component surrogate fuel mixture mechanism containing 142 species and 502 elementary reactions. The mechanism was well matched with the experimental values in the verification of three parameters, ignition delay time, laminar flame speed, and small-molecule product concentration, within the ranges of 0.1–2 MPa, 500–1300 K, and equivalence ratio of 0.7 to 1.5. Whether under normal pressure or high pressure, the relative error between the simulation data and the experimental data was within ±5%. The mechanism can accurately predict the ignition and oxidation process of RP-3 aviation kerosene.