The n-dodecane was selected as an alternative fuel of aviation kerosene in this study. Its jet combustion characteristics under supercritical condition were studied by using large eddy simulation and detailed chemical reaction kinetics. The effects of gas state equations on jet morphology

penetration

temperature

and mixing fraction were also investigated. The simulation results showed that ideal gas and real gas state equations had negligible effect on the jet penetration and macroscopic shape

while the real gas state equation had advantage to reflect the liquid fuel jet characteristics under supercritical condition

such as mixing fraction and temperature. In terms of combustion

there was an error of 10% between the simulated ignition delay and the experiment

the flame lift-off length

flame shape and soot were also well predicted

and the distribution of NOx and OH was highly consistent with the temperature field.