In this paper, three recently updated mechanisms were compared with experimental data, and FFCM 1.0 mechanism was chosen to perform chemical kinetic investigation of laminar burning velocity (LBV) for CH₄/H₂ mixtures. Results show that increasing hydrogen and pressure, LBV presents opposite results, which depends on the competition between promotion and inhibition effect at different hydrogen fractions and pressures. Based on growth rate of LBV, it is possible to determine three regimes for CH₄/H₂ mixtures at high pressures. When hydrogen fraction is less than 60%, the LBV of CH₄/H₂ mixtures at high pressures is not very sensitive to hydrogen, showing complex variation. Flame structure and radical concentration imply that the enhanced LBV by adding hydrogen, which is a combined result of chemical and thermal effects, is realized by improving the active radical production. Then, quantitative analysis of contribution value found that reaction OH+H₂=H+H₂O plays an important role in H production with increasing hydrogen fraction at high pressure. Through this work, it not only studied the interactive effect between CH₄/H₂ combustion system and varied conditions (such as pressure and hydrogen fraction), but also the influence mechanism was revealed in depth. All these have provided useful suggestions on fuel design for power machines.

本文将三种最新更新的机理与实验数据进行了比较，选择了FFCM 1.0机理对CH ₄ / H ₂混合物的层流燃烧速度（LBV）进行化学动力学研究。结果表明，随着氢和压力的增加，LBV呈现相反的结果，这取决于在不同氢分数和压力下促进和抑制作用之间的竞争。根据LBV的生长速率，可以确定高压下CH ₄ / H ₂混合物的三种方案。氢分数小于60％时，CH ₄ / H ₂的LBV高压下的混合物对氢气不是很敏感，表现出复杂的变化。火焰结构和自由基浓度暗示通过添加氢来增强LBV是化学和热效应的结合结果，是通过改善活性自由基的产生来实现的。然后，对贡献值的定量分析发现，随着高压下氢含量的增加，反应OH + H ₂ = H + H ₂ O在制氢中起重要作用。通过这项工作，它不仅研究了CH ₄ / H ₂之间的相互作用。燃烧系统和变化的条件（如压力和氢分数），但影响机理也被深入揭示。所有这些都为动力机的燃料设计提供了有用的建议。