In order to investigate the laminar combustion characteristics of 1

3

5trimethylbenzene and influence factors

the high speed schlieren technology and constant combustion bomb technology were used to carry out some experiments. The Markstein length and laminar burning speed were obtained under different initial conditions; in combination with the mechanism of the reaction of 1

3

5trimethylbenzene

it revealed the key elemental reactions leading to the change of laminar burning speed under different initial conditions

and the fitting formula of laminar burning speed was built at different initial pressures and initial temperatures. The accuracy of the fitting formula was verified

and the laminar burning speed of 1

3

5trimethylbenzene/air mixture under different initial conditions was calculated. The results show that the laminar burning speed of 1

3

5trimethylbenzene/air mixture increases with the increase of initial temperature

and decreases with the increase of initial pressures

while Markstein length decreases with the increase of initial pressure and initial temperature.