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Acta Aeronautica et Astronautica Sinica

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Study on Ignition Characteristics of Al-Mg Alloy Particles in Hot Oxygen-Contained Gas

  

  • Received:2024-10-15 Revised:2024-12-16 Online:2024-12-18 Published:2024-12-18

Abstract: 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.

Key words: Al-Mg Alloy Particle, Ignition Process, Oxidizing Gas, Ignition Time, Heterogeneous Surface Reaction

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