Combustion organization and NOx emission in a single sector model combustor
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摘要:
采用光学诊断与三维数值模拟结合的方式，研究了中心分级贫油预混预蒸发模型燃烧室燃烧组织与NOx生成特征。试验测量了模型燃烧室流速、燃油、OH和NO组分浓度分布。通过与试验结果对比，采用基于雷诺平均Navier-Stokes方程的方法对流场的预测误差为13.9%，喷雾张角预测误差为6.0%，预测的OH和NO组分分布特征与试验测量结果基本一致。数值结果表明，在单头部模型燃烧室中，主、预燃级火焰以弱耦合的方式组织燃烧，且大部分NO在预燃级高温区域生成。燃油分级比的变化（0.15～0.30）不影响燃烧室流动与火焰分布特征，但对燃烧室出口NOx生成量有一定影响，NOx生成量随着分级比增大而减少。
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关键词:
- 燃烧组织 /
- NOx排放 /
- 贫油预混预蒸发燃烧室 /
- 分级比 /
- 雷诺平均Navier-Stokes方程
Abstract:Combustion organization and NOx formation characteristics in a single sector model lean premixed pre-vaporized combustor were investigated by optical experiments and 3-dimensional numerical simulations. The flow field, spray field, OH and NO species field in the combustor were simulated by the Reynolds-averaged Navier-Stokes method and then compared with the experimental results. It was found that the prediction errors of the flow field and spray angle were 13.9% and 6.0%, respectively. The predicted OH and NO distribution characteristics were in good agreement with the experimental results. The results showed that the main and pilot flames organized combustion in a weakly coupled way, and most NO was generated in high temperature region located in the pilot stage. The variation (0.15−0.30) of fuel staging ratio did not affect the flow and combustion structure, but it had a certain influence on the NO emission, which decreased with the increase of the fuel staging ratio.
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图 6 RANS数值模拟和试验的速度分布
Figure 6. Velocity distribution comparison between RANS simulation and experiment
图 7 RANS数值模拟和试验的燃油分布
Figure 7. Droplets distribution comparison between RANS simulation and experiment
图 8 RANS数值模拟和试验的组分分布
Figure 8. Species distribution comparison between RANS simulation and experiment
图 11 不同分级比的OH质量分数分布
Figure 11. OH mass fraction distribution with different staging ratios
图 12 不同分级比的NO质量分数分布
Figure 12. NO mass fraction distribution with different staging ratios
表 1 质量流量分配
Table 1. Mass flow distribution
空气流道 实测有效开孔面积/mm2 占比/% 预燃级 166.6 11.2 主燃级、级间冷却通道、
防回火孔1158.4 77.8 端壁冷却通道 163.9 11.0 
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表 2 数值模拟工况条件
Table 2. Operating conditions for numerical simulation
工况 分级比 Tin/K pin/MPa $ {\dot m_{\text{a}}} $/（kg/s） $ {R_{{\text{fa}}}} $ 1 0.15 500 0.5 0.36 0.03 2 0.20 500 0.5 0.36 0.03 3 0.25 500 0.5 0.36 0.03 4 0.30 500 0.5 0.36 0.03
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