Publicado 6 números por año
ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678
Indexed in
NEW HTPB/AP/Al PROPELLANT COMBUSTION PROCESS IN THE PRESENCE OF ALUMINUM NANO-PARTICLES
SINOPSIS
Using the same techniques, but improved, we now have found a sensible explanation for the paradoxical results presented during the 6-ISICP, from three propellants of decreasing Al sizes. In the micrometric domain (from 5 μm to 100 μm), visualizations show the Al droplet combustion zone coming progressively closer to the combustion surface, with combustion of a higher number of smaller particles. In the nanometric domain (from 10 nm to 1 μm), a new Al oxidation mechanism seems to appear, directly at the surface without visible flame. Detailed visualization shows the flake detachment swirling in the gas-flow, without reacting. There is no luminous effect, which would indicate the slightest igniting or burning. Particle collection, at less than 3 mm from the surface, shows that these flakes are constituted of very small particles, close to an alumina composition. A setup improvement allows us to collect almost 100% of the emitted particles. This allows us to develop a mass balance compared to the initial Al in the sample, in order to guarantee diagnostic accuracy. Now, it is possible to assure that the size decrease in the nanometric domain leads to a new Al particle oxidation process at the propellant's combustion surface without agglomeration. The unburnt fraction determination in the collected particles shows a more advanced Al combustion. Beyond the nano-Al higher reactivity, the consequences are complete changes of the thermal and chemical particle environment and of the oxidation process. The early oxidation of the metal nanometric fraction releases more condensed energy at the combustion surface level, modifying the performance of the propellant. That will lead to an evolution of the combustion model for nano-Al propellants.
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