| Citation: | LI Qiujin, ZENG Wen, LIU Yu, et al. Simulation and experiment on laminar combustion characteristics of methane/ammonia mixture[J]. Journal of Aerospace Power, 2025, 40（11）：20240486 doi: 10.13224/j.cnki.jasp.20240486
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The laminar combustion characteristics of methane/ammonia mixture at the constant volume combustion bomb were measured at the initial pressures of 0.1, 0.2, 0.3 MPa, the equivalence ratios range of 0.8—1.4, the temperatures of 390, 420, 450 K, and the ammonia mixing ratios of 0.1, 0.3, 0.5. The effects of the equivalence ratio, initial pressure, initial temperature and ammonia mixing ratio on the laminar combustion characteristics of methane/ammonia mixture were obtained. Furthermore, the laminar burning velocities of methane/ammonia mixture were calculated using three detailed chemical kinetic mechanisms. The results showed that, as the equivalence ratio and initial pressure increased, cracks or cellular structures appeared on the flame front surface of methane/ammonia mixture, and the flame stability deteriorated. At the same time, the initial temperature and ammonia mixing ratio had a relatively small impact on the flame front structure and flame stability. The laminar burning velocity of methane/ammonia mixture showed a pattern of first increasing and then decreasing as the equivalence ratio increased, with the maximum value occurring at the equivalence ratio of 1.0. As the initial pressure and ammonia mixing ratio decreased or the initial temperature increased, the laminar burning velocity of methane/ammonia mixture gradually increased. Meanwhile, compared with the calculated results of the Okafor mechanism and NUIGMech 1.1 mechanism, the laminar burning velocities of methane/ammonia mixture under multiple conditions calculated by the Konnov mechanism (201 species,
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