基于OH-PLIF技术的合成气燃烧速度

为了解合成气燃烧特性，采用高精度光学测量技术PLIF，研究了不同生物质气化合成气在不同当量比下的燃烧火焰结构、OH基浓度以及火焰传播速度。采用CHEMKIN软件模拟计算了相同工况下合成气火焰传播速度，对引起温度变化和OH基浓度变化的原因进行了化学动力学分析。研究结果表明，合成气中CO含量的增加会使火焰整体结构变小，但对内焰影响程度不大，而H₂含量的增加会增大火焰的传播速度。合成气燃烧过程中主要影响OH基生成的是R36：CO+OH=CO₂+H、R43：H+O₂+M=HO₂+M和R45：H+HO₂=2OH这3个基元反应。

Study on the laminar burning velocity of syngas based on OH-PLIF technology

In order to understand the combustion characteristics of the syngas, an experiment was conducted to research the structure, distribution of OH radicals and burning velocity of the syngas-air with OH-PLIF technology. Simulations were also conducted to analyze the chemical kinetics of the combustion process. The results show that the increasing fraction of CO will shrink the structure of the flame, while the height of inner flame varies a little. However, the increasing of H₂ will increase the burning velocity dramatically. The dominant reactions on the formation of OH radical are R36:CO+OH=CO₂+H, R43:H+O₂+M=HO₂+M and R45:H+HO₂=2OH.