铝镁合金颗粒具有点火延迟时间短、燃烧速率快等特点，是固体推进剂中重要的金属添加剂。首先利用高温燃气中金属颗粒着火特性试验系统，获得了铝镁合金颗粒在O₂、H₂O、CO₂等组成的高温燃气环境中的着火时间。建立了一种考虑对流换热、辐射换热、表面多相化学反应共同作用的铝镁合金颗粒着火过程仿真方法，并对合金颗粒着火时间计算结果进行了验证，预示误差在15%以内。高温燃气环境中着火过程仿真结果表明，铝含量90%的100 μm球形雾化铝镁合金颗粒在氧含量为30.4%的工况中，对流换热、辐射换热、表面多相化学反应放热提供的热量约为2∶2∶1，氧气参与的反应放热占比达到59.44%，镁参与的反应放热占比达到25.82%。高温燃气的气流速度、温度对铝镁合金颗粒着火时间影响显著，前者主要通过影响对流换热速率进一步影响合金颗粒的着火时间，后者主要通过影响辐射换热速率进一步影响合金颗粒的着火时间。

Al-Mg alloy particles， characterized by short ignition delay times and rapid combustion rates， serve as critical metal additives in solid propellants. An experimental system for investigating the ignition characteristics of metal particles in high-temperature gas environments was employed to measure the ignition times of aluminum-magnesium alloy particles exposed to high-temperature gas mixtures composed of O₂，H₂O， and CO₂. A simulation method for the ignition process of aluminum-magnesium alloy particles was developed， incorporating the combined effects of convection heat transfer， radiation heat transfer， and Heterogeneous Surface Reaction （HSR）. The computational results for particle ignition times were validated， showing a prediction error within 15%. The ignition process of 100 μm spherical atomized Al-Mg alloy particle with 90wt% Al content in oxygen concentration of 30.4% condition was simulated. Results indicate that the heat contributions from convection heat transfer， radiation heat transfer， and HSR heat release maintained a ratio of approximately 2∶2∶1. Specifically， exothermic reactions involving oxygen accounted for 59.44% of the total heat release， while those involving magnesium contributed 25.82%. The ignition time of aluminum-magnesium alloy particles is significantly influenced by the gas flow velocity and temperature of the high-temperature environment. The former primarily affects ignition time by altering convection heat transfer rates， whereas the latter primarily impacts ignition time through variations in radiation heat transfer rates.