A multi-perspective kinetic study of 2,5-dimethylfuran on PRF50 laminar combustion characteristics and soot precursor formation

Abstract This study investigated the laminar combustion characteristics and the soot precursors formation of biomass oxygen-containing fuel 2,5-dimethylfuran (DMF) doped with gasoline alternative fuel 50 % vol. n -heptane/50 % vol. iso-octane (PRF50) through one-dimensional laminar premixed flame. An increase in initial temperature resulted in higher laminar burning velocities, adiabatic flame temperatures, net heat release rates, density ratios, and reduced flame thickness for the PRF50/DMF flames. An increase in initial temperature promoted the soot precursors formation, while an increase in initial pressure reduced the generation of acetylene but promoted an increase in A2. With the increase of DMF blending ratio, the laminar burning velocities and the soot precursors formation slightly improved, and the promotion effect on A2 generation was more significant. For the study of net heat release rates, it was found that the increase in initial temperature and equivalence ratios would slightly increase, but the initial pressure would cause an exponential increase. With the increase of DMF blending ratio, the peak positions of net heat release rate generations shifted downstream of the flame. With the increase of 2,5-dimethylfuran blending ratio, the sensitivity coefficient inhibitory effects of CH 3 + H(+M) <=> CH 4 (+M), HCO + H <=> CO + H 2, and H + OH + M<=>H 2 O + M weaken. For PRF50 doping with different DMF ratios, the promoted rate of productions reactions of A4 were mainly C 4 H 2 + A2R5 <=> A4, C 6 H 5 C 2 H + C 6 H 5 C 2 H- <=> A4 + H, N–C 8 H 7 + C 6 H 5 C 2 H => A4 + H 2 + H, INDENYL + C 6 H 5 CH 2 => A2 + 2H 2 , A3CH 2 + CH 2 <=> A4 + H 2 + H.