Laser-assisted ignition and combustion characteristics of consolidated aluminum nanoparticles

Saceleanu, Florin; Wen, John Z.; Idir, Mahmoud; Chaumeix, Nabiha

doi:10.1007/s11051-016-3625-5

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…The addition of high-energy-density particles such as aluminum (Al, 84 kJ cm –3 ) to liquid fuels represents a potential approach toward increasing the energy available from the overall reaction . Therefore, interest in the combustion of aluminum and aluminum-doped hydrocarbon fuels has generated extensive research both experimentally − and theoretically. − The combustion of Al particles is influenced by their size, that is, the Al reactivity increases with decreasing particle diameter. − , Also, the ignition temperature of Al particles decreases from 2350 K for a diameter of 100 μm to 933 K for a diameter of 100 nm. Decreasing from micrometer- to nanometer-sized Al particles results in a reduced ignition delay, an increased flame speed, and an improved combustion efficiency. − ,, …”

Section: Introductionmentioning

confidence: 99%

Effects of Size and Prestressing of Aluminum Particles on the Oxidation of Levitated exo-Tetrahydrodicyclopentadiene Droplets

et al. 2020

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Addition of high-energy-density materials such as aluminum (Al) microparticles or nanoparticles to liquid propellants potentially improves performance of the fuel. We report on the effects of untreated, prestressed, and superquenched aluminum particles with diameters of 100 nm, 250 nm, 500 nm, 1.6 μm, and 8.8 μm on the combustion of JP-10 droplets acoustically levitated in an oxygen–argon atmosphere. Ignition was initiated by a carbon dioxide laser, and the resulting oxidation processes were traced by Raman, Fourier-transform infrared (FTIR), and ultraviolet–visible (UV–vis) spectroscopies together with high-speed optical and IR thermal-imaging cameras. The UV–vis emission spectra reveal that the key reactive radical intermediates hydroxyl (OH), methylidyne (CH), dicarbon (C2), aluminum monoxide (AlO), and aluminum monohydride (AlH) were formed in addition to atomic aluminum (Al) and the final oxidation products of JP-10, namely, water (H2O) and carbon dioxide (CO2). The Al particles facilitated ignition of the JP-10 droplets and produced higher temperatures in the combustion process of up to typically 2600 K. The effect of the Al particles on the ignition and maximum flame temperatures increased as the diameters reduced. The different stress treatments did not produce observable changes for the ignition or combustion of the droplets, which indicates that the liquid propellant was not significantly affected by manipulating the mechanical properties of the fuel particle additive. The initiation and enhancement of the combustion were a consequence of forming highly reactive atomic oxygen (O) and aluminum monoxide (AlO) radicals in the reaction of aluminum atoms with molecular oxygen in the gas phase. These radicals initiate the degradation of JP-10 via atomic hydrogen abstraction forming the hydroxyl (OH) and aluminum hydroxide (AlOH) radicals in reactions which are mainly exothermic by up to 68 kJ mol–1. In contrast, hydrogen abstractions from JP-10 by molecular oxygen or atomic aluminum are strongly endothermic by up to 236 kJ mol–1, thus making these reactions less competitive. The generation of C10H15 hydrocarbon radicals from the JP-10 initiates successive oxidations and chain reactions with molecular oxygen leading eventually to carbon dioxide and water. These combined experimental results provide insight into how aluminum particles facilitate the oxidation and reaction mechanisms of JP-10 droplets.

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Section: Introductionmentioning

confidence: 99%

Effects of Size and Prestressing of Aluminum Particles on the Oxidation of Levitated exo-Tetrahydrodicyclopentadiene Droplets

et al. 2020

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“…Laser ignition can be classified into two types: ignition with breakdown of plasma by the focused pulsed laser [33][34][35] and heat ignition by a continuous-wave (CW) laser [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Continuous‐Wave Laser Ignition of Non‐Solvent Ionic Liquids Based on High Energetic Salts with Carbon Additives

Itouyama

Habu

2019

Propellants Explo Pyrotec

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The ignition system for ammonium dinitramide‐based non‐solvent ionic liquids (ADN‐EILPs) with a continuous‐wave (CW) laser was investigated. The efficiency of conversion from CW laser power to ignition energy for ADN‐EILPs is important, and carbon additives are expected to enhance the efficiency of conversion. The impact of additive shapes on ADN‐EILP ignition by CW lasers is discussed herein by comparing the results of the ignition behavior observation using a high‐speed infrared camera. The shapes of the carbon additives are of two different types: fine fiber mass, called carbon wool, and powder of graphite. The ignition delay of carbon wool mixed ADN‐EILPs is shorter than that of the sample with graphite powder. The difference in these results might depend on the low dispersibility in ADN‐EILPs of carbon wools and the presence of local heat spots owing to the CW laser. The addition of carbon wools in ADN‐EILPs is expected to facilitate their ignition by CW laser heating.

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Facile preparation and synergetic energy releasing of nano-Al@RDX@Viton hollow microspheres

Yan

Ren

Liu

et al. 2020

Chemical Engineering Journal

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Laser-assisted ignition and combustion characteristics of consolidated aluminum nanoparticles

Cited by 9 publications

References 17 publications

Effects of Size and Prestressing of Aluminum Particles on the Oxidation of Levitated exo-Tetrahydrodicyclopentadiene Droplets

Effects of Size and Prestressing of Aluminum Particles on the Oxidation of Levitated exo-Tetrahydrodicyclopentadiene Droplets

Continuous‐Wave Laser Ignition of Non‐Solvent Ionic Liquids Based on High Energetic Salts with Carbon Additives

Facile preparation and synergetic energy releasing of nano-Al@RDX@Viton hollow microspheres

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