Premixed and partially premixed flames (PPFs) of H₂/CO/air syngas are studied numerically to investigate the effect of pressure on syngas PPF structure. Chemical characteristics of the syngas flame at different pressures are investigated based on reaction limit analysis using a one-dimensional configuration. The results show that CO affects the syngas reaction limits through both physical effects that consist mainly in dilution and chemical effects that are related to both R23 (CO + OH = CO₂ + H) and HCO pathway. In particular, the HCO pathway weakens the flame at low pressures due to the chain-terminating effect of R25 (HCO + O₂ = CO + HO₂) and R26 (HCO + H = CO + H₂), and enhances the flame at high pressures because of the contribution of R25 to the HO₂ chain-branching process. These CO chemical characteristics are also observed in the premixed zone of 50% H₂ + 50% CO syngas PPFs whereas only R23 is important in the non-premixed zone.

_{对 H 2} /CO/空气合成气的预混和部分预混火焰 (PPF)进行了数值研究，以研究压力对合成气 PPF 结构的影响。基于使用一维配置的反应极限分析，研究了不同压力下合成气火焰的化学特性。结果表明，CO 通过物理效应（主要包括稀释）和与 R23（CO + OH = CO ₂  + H）和 HCO 途径相关的化学效应影响合成气反应极限。_{特别是，由于 R25 (HCO + O 2}  = CO + HO ₂ ) 和 R26 (HCO + H = CO + H ₂ )的链终止效应，HCO 通路在低压下削弱了火焰_{), 并由于 R25 对 HO 2}链支化过程的贡献而在高压下增强火焰。这些 CO 化学特性也在 50% H ₂  + 50% CO 合成气 PPF 的预混区中观察到，而在非预混区中只有 R23 是重要的。