The effects of hydrogen(H₂) on the macroscopic explosion parameters and microscopic chemical kinetics of methane(CH₄)-air mixtures were investigated. First, the effect of H₂ on the flammable limit of CH₄ was studied with a.

standard test device. Second, the explosion characteristic parameters of CH₄-H₂-air mixtures were measured in a standard 20-L spherical chamber, including the maximum explosion pressure, maximum pressure rise rate and combustion time. Finally, based on the GRI mech 3.0 and USC mech 2.0 mechanisms, the effect of H₂ on the chemical kinetics of CH₄-air mixtures was studied. The results reveal that the flammable limit of CH₄ is expanded and the explosion risk value is enhanced with the addition of H₂, and more inert gas is required to inertize CH₄. The explosion intensity of the CH₄-air premixed gas rises after H₂ addition in the fuel-lean state. The explosion intensity first increases and then decreases with increasing H₂ addition under stoichiometric conditions. The addition of H₂ under fuel-rich conditions reduces the explosion intensity of the premixed gas. Moreover, under the three CH₄ conditions, the main elementary reactions affecting the sensitivity and production rate of the key free radicals (H, O and OH) are the same, and as the H₂ addition amount increases from 0% to 2%, the sensitivity coefficient of the elementary reactions accordingly increases.

研究了氢气（H ₂）对甲烷（CH ₄）-空气混合物宏观爆炸参数和微观化学动力学的影响。首先，用a研究了H ₂对CH ₄易燃极限的影响。

标准测试设备。其次，在标准的20 L球形室内测量CH ₄ -H _2-空气混合物的爆炸特性参数，包括最大爆炸压力，最大压力上升速率和燃烧时间。最后，基于GRI机制3.0和USC机制2.0机理，研究了H ₂对CH _4-空气混合物化学动力学的影响。结果表明，加入H ₂可以扩大CH ₄的可燃极限，增加爆炸危险值，对CH _4进行惰性化处理需要更多的惰性气体。H ₂之后，CH ₄空气预混合气体的爆炸强度增加处于稀油状态。在化学计量条件下，爆炸强度首先随着H _2的添加而增加，然后减小。在富含燃料的条件下添加H ₂会降低预混合气体的爆炸强度。此外，在三种CH ₄条件下，影响关键自由基（H，O和OH）的敏感性和生产率的主要元素反应是相同的，并且随着H _2的添加量从0％增加到2％，基本反应的灵敏度系数相应增加。