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- W4206839771 abstract "A multidimensional numerical study was conducted to explore the ignition and combustion of aluminum powder dispersed by a trinitrotoluene (TNT) charge. The simulations used a high-order numerical method for a compressible reactive gas that is coupled to a Eulerian kinetic-theory-based granular multiphase model. The model is valid up to the packing limit and accounts for effects including compaction waves and particle collisions. Scenarios where an annular shell of Al powder with a volume fraction of 50% surrounding a TNT charge were simulated in an enclosed domain. Monodisperse Al particle diameters of 3, 6, 10, and 30 μm were considered. The simulations fully coupled particle dispersal, ignition, and combustion. The results show the formation of particle fingers and other finite Stokes number effects as the particles are radially dispersed by the expanding TNT detonation products. The 3-, 6-, and 10-μm-diameter Al particles ignite when they interact with the afterburning TNT fireball, which is the only location that exceeds the Al ignition temperature. Particle inertia initially separates the Al particles from the TNT fireball, which prohibits ignition. The inner edge of the Al dust cloud comes into contact with the fireball during the reshock phase of the blast due to finite Stokes number effects. The 30-μm-diameter Al particles did not ignite because they were launched too far from the TNT fireball. The energy released from the turbulent Al dust flame produced quasistatic overpressures over 3 bar, which is a dramatic increase of the 0.8 bar produced by a bare TNT charge. The results also show that the energy release rate for the Al particles is much more intense and shorter in duration for the 3-μm-diameter particles than for the 6- or 10-μm-diameter particles." @default.
- W4206839771 created "2022-01-25" @default.
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- W4206839771 date "2022-01-01" @default.
- W4206839771 modified "2023-10-14" @default.
- W4206839771 title "Ignition and Combustion of TNT-Dispersed Aluminum Powder" @default.
- W4206839771 doi "https://doi.org/10.1615/intjenergeticmaterialschemprop.2022038884" @default.
- W4206839771 hasPublicationYear "2022" @default.
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