In this work, the explosive combustion of NH3/CH3OH/air mixtures covering wide ranges of equivalence
ratios
(0.7–1.7) and CH3OH mole fractions (0.2–1.0)
was investigated experimentally and theoretically at ambient temperature
and pressure. Results showed that the addition of CH3OH
increases the maximum explosion pressure and maximum pressure rise
rate. The empirical correlations for the maximum explosion pressure
and maximum pressure rise rate are proposed, respectively. Furthermore,
the heat loss of the explosion decreases significantly with the increasing
CH3OH mole fraction. According to the instability analysis,
the tendency of flame instability is enhanced with the enrichment
of CH3OH due to the promoted hydrodynamic instability.
Besides, the maximum pressure rise rate is augmented by flame instability.
Kinetic analysis indicates that the CH3OH addition enhances
the net heat release rate and active radicals. The total heat release
of the NH3/CH3OH/air explosion is mainly attributed
to the reactions R3: OH + H2 ⇔ H + H2O, R11: HO2 + H ⇔ 2OH, R24: CO + OH ⇔ CO2 + H, and R284: NH3 + H = NH2 + H2, while the predominant endothermal reaction is R1: H + O2 ⇔ O + OH. With the addition of CH3OH, the
chemical effect has the largest contributions to the accelerated flame
propagation on the lean and stoichiometric side, while the contributions
of thermal and transport effects are dominant on the rich side.
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