Condense-luminescence and global characterization of metal particle suspension combustion

Tran, Quan; Pantoya, Michelle L.; Altman, Igor

doi:10.1016/j.jaecs.2022.100080

Applications in Energy and Combustion Science

2022

DOI: 10.1016/j.jaecs.2022.100080

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Condense-luminescence and global characterization of metal particle suspension combustion

Quan Tran¹,

Michelle L. Pantoya²,

Igor Altman³

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Cited by 4 publications

(1 citation statement)

References 24 publications

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“…The distinct variations in alumina phases detected in the product residue may be an indication of altered reaction mechanisms for the two Al powders. For example, Tran et al 48 studied the combustion of similar Valimet H2 μAl powders suspended in a porous polycarbohydrate matrix. They altered the standard H2 μAl powder by applying an annealing and quenching treatment that reduced the surface energy of the particle and increased the particle dilatational strain.…”

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Synthesis of Bayerite-Passivated Aluminum Particles and Their Combustion in Solid Propellants

Malek,

Benson,

Pantoya

et al. 2024

ACS Appl. Eng. Mater.

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The combustion mechanism of aluminum (Al) particles depends on the alumina (Al2O3) passivation layer surrounding the metal core. Hydrating Al2O3 into bayerite (Al(OH)3) can alter the interfacial reactions and energy conversion behavior of the metal fuel particles. This study explores chemical weathering of the surface of micron-sized aluminum (μAl) particles using temperature and time in solution as parameters for shell hydration in aqueous suspensions. Using X-ray diffraction, microscopy, spectroscopy, and thermal analysis, the formation of an Al(OH)3 shell is confirmed on μAl particles with greater than 96 wt % Al core retained. A detailed mechanism for surface hydration is discussed. The hydrated metal particles were then evaluated as a potential solid composite propellant fuel. Burn rate experiments were performed in a windowed pressure vessel, and condensed phase combustion products were recovered. Results show that the burn rate of hydrated μAl (1.068 cm/s) is 17.75% higher compared to standard μAl (0.907 cm/s) at 10.34 MPa with hydrated μAl showing a clear particle suspension entrained near the burning surface. The hydrated shell enables oxidizing gas generation in proximity to the exposed Al core contributing to more complete combustion and accelerated burn rates at higher pressures. The solution-based hydration technique alters interface properties and affects the reaction mechanism and combustion demonstrated for propulsion applications.

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confidence: 99%

Synthesis of Bayerite-Passivated Aluminum Particles and Their Combustion in Solid Propellants

Malek,

Benson,

Pantoya

et al. 2024

ACS Appl. Eng. Mater.

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Demonstrating an altered metal oxidation reaction mechanism correlated with variations in surface energy

et al. 2023

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Quantifying dispersion and light emission for aluminum powder suspensions with varied surface energy

Key,

Kuhn,

Harland

et al. 2024

Physics of Fluids

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The dust combustion of aluminum (Al) particles post ballistic impact was studied bi-spectrally in the visible (VIS) and near-infrared (NIR) using high-speed imaging. Powders were delivered loosely via a novel sabot design into a chamber and impacted an anvil at speeds of 1050 m/s. Two identically sized Al powders were studied, one was untreated (UN), the other processed using a thermal annealing and quenching treatment called superquenched (SQ). The SQ Al powder had reduced surface energy compared to UN Al powder, which was induced by the annealing–quenching treatment. Particle dispersion and emission during reaction was quantified by introducing a field emission fraction metric that characterizes the burning powder cloud and relates to particle combustibility. In the case of SQ Al, VIS light emission from dispersed powder decays slower compared to UN Al. High-speed NIR imaging shows UN Al agglomerates resulting in high concentrations of unreacted Al. The differences in powder dispersion and emission were attributed to different combustion regimes and further confirmed by x-ray diffraction analysis of post-burn products, which demonstrated different residue phase compositions. This study demonstrates that a field emission fraction is a quantitative analysis tool to simultaneously evaluate dispersion and emission of dust combustion.

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Condense-luminescence and global characterization of metal particle suspension combustion

Cited by 4 publications

References 24 publications

Synthesis of Bayerite-Passivated Aluminum Particles and Their Combustion in Solid Propellants

Synthesis of Bayerite-Passivated Aluminum Particles and Their Combustion in Solid Propellants

Demonstrating an altered metal oxidation reaction mechanism correlated with variations in surface energy

Quantifying dispersion and light emission for aluminum powder suspensions with varied surface energy

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