In this study, the examination of the explosion pressure and flame propagation characteristics were investigated for premixed CH₄–H₂-air mixtures, with varying equivalence ratios (φ = 0.8–1.5) and methane volume ratios (R = 0–100%). This investigation was conducted employing a 20 L explosion vessel and a high-speed ripple shadow meter, while maintaining ambient temperature and pressure. The most critical primitive reactions effecting the formation and consumption of OH* were obtained by normalisation through rate analysis. The result found that as the R increased at the same φ, the premixed system exhibited a gradually decreased in the P_max, (dP/dt)_max, and K_G. The increase in the R caused the flame structure to stabilise, extending the flame front distance and the time to reach the wall. The reaction process was divided into three phases based on the R: 0 < R<40% (dominated by hydrogen combustion), 40% < R<80% (dominated by methane and hydrogen co-combustion), and 80% < R<100% (dominated by methane combustion). The analysis of OH* production rate showed that R84 and R38 were the most dominant reactions promoting the OH* production and consumption, respectively. As R was increased, both the production and consumption rates of OH* decreased resulting in a weakening of the explosive reaction's intensity.

在本研究中，研究了具有不同当量比 (φ = 0.8–1.5) 和甲烷体积比 (R = 0–100%) 的预混合 CH ₄ –H ₂ -空气混合物的爆炸压力和火焰传播特性。 。这项研究是使用 20 L 爆炸容器和高速波纹阴影仪进行的，同时保持环境温度和压力。通过速率分析进行归一化，获得了影响 OH* 形成和消耗的最关键的原始反应。_{结果发现，在相同的φ下，随着R的增加，预混体系的P max}、(dP/dt) _max和K _G逐渐降低。R的增加导致火焰结构稳定，延长了火焰前锋距离和到达壁面的时间。根据R将反应过程分为三个阶段：0<R<40%（以氢气燃烧为主）、40%<R<80%（以甲烷和氢气共燃为主）、80%<R< 100%（主要是甲烷燃烧）。OH*产率分析表明，R84和R38分别是促进OH*产生和消耗的最主要反应。随着R的增加，OH*的产生和消耗速率均下降，导致爆炸反应强度减弱。