Impact of dissociated Methanol addition on premixed Toluene reference fuel-air mixtures in a constant-volume chamber

The effects of dissociated methanol addition on a premixed toluene reference fuel was studied in a constant-volume chamber at initial conditions of 0.1 MPa and 398 K. Hydrogen was also added in separate proportions under the same conditions in order to assess its effects. Dissociated methanol fractions of 30%, 50%, 70%, 90%, hydrogen fractions of 50% and 90%, and equivalence ratios from 0.6 to 1.4 were analysed. The laminar burning velocities of the toluene reference fuel-dissociated methanol-air mixtures and the toluene reference fuel-hydrogen-air mixtures were measured by the spherically expanding flame method with a schlieren photography system. The effects of dissociated methanol addition on the laminar burning velocities was evaluated, and the relationships between the laminar burning velocity and the equivalence ratio or dissociated methanol fraction at 398 K and 0.1 MPa were fitted with a third-order polynomial function. Furthermore, the flame instabilities of toluene reference fuel-dissociated methanol-air mixtures and toluene reference fuel-hydrogen-air mixtures were also discussed.