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和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、辐射换热和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、辐射换热以及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74.18%，镁参与的反应放热占比达到25.82%。高温燃气的气流速度和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 have the characteristics of short ignition time and fast burning rate, and are important metal additives in solid propellants. The ignition times of spherical Al-Mg alloy particles in a high-temperature gas environment com-posed of O2, H2O and CO2 were measured using an experimental setup of metal particle ignition. A simulation meth-od for the ignition process of Al-Mg alloy particle was established, which took into account the effects of convective heat transfer, radiation heat transfer and heterogeneous surface reaction (HSR). The calculated ignition time of the alloy particle was experimentally verified, and the predicted error was within 15%. Simulation results indicate that during the ignition process of spherical atomized aluminum-magnesium alloy particles with a diameter of 100 μm and an aluminum content of 90% under conditions with an oxygen mass fraction of 30.4%, the heat provided by convection heat transfer, radiation heat transfer and HSR heat release was approximately 2:2:1, the heat release of the reaction involving oxygen accounted for 74.18%, and the heat release of the reaction involving magnesium ac-counted for 25.82%. The velocity and temperature of gas further influence the ignition time of the alloy particles mainly by affecting the ignition time of particles by affecting the convective heat transfer rate and the radiation heat transfer rate, respectively.