Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

Lin, Chengyuan; Zhang, Minqi; Wang, Yue; Li, Shengji; Xu, Jian; Pan, Sunqiang

doi:10.3390/pr9081276

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…Mg microparticles were prepared using the melt atomization technique and were characterized by multiple methodologies such as SEM, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and EDS. These results have been presented in our previous work [20], demonstrating that Mg microparticles are uniform and spherical, with a purity of approximately 100%. There is a thin but not compact oxide layer on the surface.…”

Section: Materials and Experimental Details 21 Materialssupporting

confidence: 85%

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Yang

Lin

et al. 2021

Processes

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Although the gas phase combustion of metallic magnesium (Mg) has been extensively studied, the vaporization and diffusive combustion behaviors of Mg have not been well characterized. This paper proposes an investigation of the vaporization, diffusion, and combustion characteristics of individual Mg microparticles in inert and oxidizing gases by a self-built experimental setup based on laser-induced heating and microscopic high-speed cinematography. Characteristic parameters like vaporization and diffusion coefficients, diffusion ratios, flame propagation rates, etc., were obtained at high spatiotemporal resolutions (μm and tens of μs), and their differences in inert gases (argon, nitrogen) and in oxidizing gases (air, pure oxygen) were comparatively analyzed. More importantly, for the core–shell structure, during vaporization, a shock wave effect on the cracking of the porous magnesium oxide thin film shell-covered Mg core was first experimentally revealed in inert gases. In air, the combustion flame stood over the Mg microparticles, and the heterogeneous combustion reaction was controlled by the diffusion rate of oxygen in air. While in pure O2, the vapor-phase stand-off flame surrounded the Mg microparticles, and the reaction was dominated by the diffusion rate of Mg vapor. The diffusion coefficients of the Mg vapor in oxidizing gases are 1~2 orders of magnitude higher than those in inert gases. However, the diffusive ratios of condensed combustion residues in oxidizing gases are ~1/2 of those in inert gases. The morphology and the constituent contents analysis showed that argon would not dissolve into liquid Mg, while nitrogen would significantly dissolve into liquid Mg. In oxidizing gases of air or pure O2, Mg microparticles in normal pressure completely burned due to laser-induced heating.

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Section: Materials and Experimental Details 21 Materialssupporting

confidence: 85%

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Yang

Lin

et al. 2021

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Comparison on ignition and combustion of AlMgB composite fuel and B fuel

Zhang

Lin

Yang

et al. 2022

Chemical Engineering Journal

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Insights into the Fragmentation of Aluminum Hydride and Its Effect on Combustion and Agglomeration of HTPB Propellant

Jiang,

Zhao,

Qin

et al. 2024

ACS Appl. Mater. Interfaces

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AlH 3 has gained considerable attention as a fuel additive due to its ability to offer high specific impulse and superior combustion performance. However, few studies have focused on the fragmentation and agglomeration behavior of AlH 3 . This study investigated the effects of fragmentation of AlH 3 and AlH 3 /PVDF particles on the thermal decomposition, ignition, agglomeration, and combustion of HTPB propellants. Thermal analysis indicated that AlH 3 and AlH 3 /PVDF can accelerate the decomposition of ammonium perchlorate by abundant active sites for the adsorption of the decomposition intermediates. Single-particle combustion uncovered the mechanism behind the directional spray of molten Al from the AlH 3 particle and the fragmentation of the AlH 3 / PVDF particle. The melting of porous Al induces particle shrinkage due to solid−liquid interfacial tension and the structural restoration of the oxide shell, which consequently results in the sealing of cracks in the oxide shell of AlH 3 . Additionally, the accumulation of internal tensile stress leads to the reopening of these cracks and the directional ejection of the molten Al. The flexible oxide shell contributes to a smaller minimum normalized diameter of the AlH 3 /PVDF particle, aiding in the generation of internal tensile stress, while the sublimation of AlF 3 induced the fragmentation. Synchrotron-based X-ray imaging revealed the formation of aggregates promoted by molten Al, the splitting of AlH 3 aggregates due to hydrogen explosion, and the enhanced fragmentation of AlH 3 /PVDF due to the synergistic effect of hydrogen explosion and the sublimation of AlF 3 . Compared to raw particles, the CCPs (condensed combustion products) of SP2 propellant display a 48% reduction in average size (D 50 = 24.5 μm), whereas there is an over 89% decrease in particle size for the CCPs of SP3 propellant (D 50 = 5.14 μm). This study contributes to understanding the fragmentation of AlH 3 and AlH 3 /PVDF upon ignition and combustion, providing valuable insights for the development and optimization of propellants containing AlH 3 .

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Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

Cited by 5 publications

References 21 publications

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Comparison on ignition and combustion of AlMgB composite fuel and B fuel

Insights into the Fragmentation of Aluminum Hydride and Its Effect on Combustion and Agglomeration of HTPB Propellant

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