Simulation and experiment on laminar combustion characteristics of methane/ammonia mixture
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摘要:
利用定容燃烧弹对甲烷/氨气混合气在初始压力分别为0.1、0.2、0.3 MPa、当量比范围为0.8～1.4、初始温度分别为390、420、450 K、氨气掺混比分别为0.1、0.3、0.5工况下的层流燃烧特性进行了实验测试，获得了当量比、初始压力、初始温度及氨气掺混比对甲烷/氨气混合气层流燃烧特性的影响规律。另外，采用3种不同的详细反应机理对甲烷/氨气混合气的层流燃烧速度进行了数值计算。结果表明：随当量比、初始压力升高，火焰前锋面出现裂纹、胞状结构，火焰稳定性变差；初始温度与氨气掺混比对火焰前锋面结构及火焰稳定性影响较小。随当量比增大，甲烷/氨气混合气的层流燃烧速度先增大后减小，当量比为1.0时达到最大；随初始压力、氨气掺混比降低或初始温度增大，甲烷/氨气混合气的层流燃烧速度逐渐增大。另外，与Okafor机理、NUIGMech 1.1机理相比，采用Konnov机理（201种组分、
2300 个反应）计算得到的多工况条件下甲烷/氨气混合气的层流燃烧速度与实验值最为吻合。Abstract: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,
2300 reactions) agreed well with the corresponding experimental data. -
图 3 当量比对甲烷/氨气混合气火焰发展的影响（p=0.1 MPa、T=390 K、$ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
Figure 3. Effect of equivalent ratio on the flame development of methane/ammonia mixture（p =0.1 MPa, T=390 K, $ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
图 4 初始温度对甲烷/氨气混合气火焰发展的影响（p =0.1 MPa、ϕ=1.0、$ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
Figure 4. Effect of initial temperature on the flame development of methane/ammonia mixture （p =0.1 MPa, ϕ=1.0, $ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
图 5 初始压力对甲烷/氨气混合气火焰发展的影响（T=420 K、ϕ=1.0、$ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
Figure 5. Effect of initial pressure on the flame development of methane/ammonia mixture （T=420 K, ϕ=1.0, $ {\alpha _{{\text{N}}{{\text{H}}_{\text{3}}}}} $=0.5）
图 6 氨气掺混比对甲烷/氨气混合气火焰发展的影响（p =0.1 MPa、T=390 K、ϕ=1.0）
Figure 6. Effect of ammonia mixing ratio on the flame development of methane/ammonia mixture（p =0.1 MPa, T=390 K, ϕ=1.0）
图 11 初始工况条件对层流燃烧速度的影响
Figure 11. Effect of the initial conditions on the laminar burning velocity
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