Radiative characteristics of an aluminum dust flame. Condensed phase

Poletaev, N. I.; Florko, A. V.

doi:10.1007/s10573-007-0056-8

Cited by 22 publications

(45 citation statements)

References 6 publications

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“…This value was used in the present work to estimate the parameters of the combustion zone. The results of [12] suggest that the dust flames studied (the flame size is a few centimeters, and the width of the flame combustion zone is 1-2 mm) in the visible and IR ranges of wavelengths are optically thin.…”

Section: Experimental Setup and Experimental Techniquementioning

confidence: 88%

“…The average particle size of the condensed combustion products (Al 2 O 3 ) was d c = 0.1 μm. More details of the dispersed characteristics of the combustion products of aluminum with the above-mentioned parameters are given in [12].…”

Section: Experimental Setup and Experimental Techniquementioning

confidence: 99%

“…The results of spectral studies of the emission characteristics of the condensed phase of Al dust flames are described in [12]. The condensed-phase temperature in the combustion zone with the above parameters is T c = 3150 ± 100 K. After Abelian transformations, the visible width of the flame combustion zone (L) determined from the radial distributions of the luminous flux (λ = 8000Å) is L = 1.2 ± 0.2 mm.…”

Section: Experimental Setup and Experimental Techniquementioning

confidence: 99%

“…It suggests that the Al vapor is localized around the burning metal particles and, hence, the flame front consists of a set of microflames of individual particles. Indeed, assuming that the combustion zones of individual particles are collectivized, i.e., the Al vapor is uniformly distributed at the flame front, setting the gas temperature equal to the condensed-phase temperature (T g = T c = 3150 K [12]), and using Boltzmann's distribution for the electronic level populations ignoring emission reabsorption, we have…”

Section: Spectral Studies Of the Combustion Zone By The Resonance Linmentioning

confidence: 99%

“…The thermal and concentration structures of a laminar diffusion twophase flame of Al particles were studied using spectral methods for diagnostics of the gas component of the flame combustion zone. Results from spectral studies of the emission characteristics of the condensed phase of a laminar flame of Al particles are given in [12]. Figure 1 gives a diagram of an experimental facility for producing a dust flame of Al particles and spectral studies of the gas and condensed components in the combustion zone.…”

Section: Introductionmentioning

confidence: 99%

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Spectral studies of the gas component of an aluminum dust flame

Poletaev

Florko

2008

Combust Explos Shock Waves

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The combustion zone of a steady-state laminar diffusion flame of aluminum particles of diameter 4.8 µm at a metal weight percentage of 0.4 kg/m 3 was studied by atomic and molecular emission spectra. Absolute measurements of the luminosity of the sequence of bands due to AlO made it possible to determine the gas-phase temperature (3200±100 K) and the AlO vapor concentration [(1.5 ± 0.5) · 10 21 m −3 ] at the flame front. From an analysis of measurement data on the intensity and contour of the resonance line of aluminum, it is concluded that the metal particles burn individually to form microflames. Estimates were made of the size of the combustion zone of an individual particle and the gas-phase temperature near a particle (3150 ± 200 K). Some features of the combustion mechanism of fine aluminum particles in the dust flame are analyzed. The capabilities of spectral methods for studying the thermal and concentration structures of dust flames are demonstrated.

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Section: Experimental Setup and Experimental Techniquementioning

confidence: 88%

Section: Experimental Setup and Experimental Techniquementioning

confidence: 99%

Section: Experimental Setup and Experimental Techniquementioning

confidence: 99%

Section: Spectral Studies Of the Combustion Zone By The Resonance Linmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral studies of the gas component of an aluminum dust flame

Poletaev

Florko

2008

Combust Explos Shock Waves

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Aluminum Burn Rate Modifiers Based on Reactive Nanocomposite Powders

Stamatis

Jiang

Beloni

et al. 2010

Propellants Explo Pyrotec

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Aluminum powders have long been used as additives in propellants, pyrotechnics, and explosives. Aluminum has a high enthalpy of combustion but relatively low burn rate. Addition of reactive nanocomposite powders can increase the burn rate of aluminum and thus the overall reaction rate of the energetic formulation. Replacing only a small fraction of the fuel by a nanocomposite material can enhance the reaction rate with little change to the thermodynamic performance of the formulation. This research showed the feasibility of the above concept using nanocomposite powders prepared by arrested reactive milling (ARM), a scalable "top-down" technique for manufacturing reactive nanomaterials. The nanocomposite materials used in this study were 2B þ Ti, and Al-rich thermites: 8Al þ 3CuO, and 8Al þ MoO 3 . The reactive nanocomposite powders were added to micrometer-sized aluminum powder and the mixture was aerosolized and burned in a constant volume chamber. The combustion atmosphere was varied using oxygen, nitrogen, and methane. The resulting pressure traces were recorded and processed to compare different types and amounts of modifiers. Additives of nanocomposite powders of 8Al þ MoO 3 and 2B þ Ti to micrometer-sized aluminum were found to be effective in increasing both the rate of pressure rise and maximum pressure in the respective constant volume explosion experiments. It was observed that 20 wt.-% of additive resulted in the best combination of the achieved burn rate and pressure.

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On the Origin and Use of the Emissivity Approximations for Alumina Particles

Kalman

Hedman

2016

Propellants Explo Pyrotec

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The commonly used spectral dependences for the emissivity of aluminum oxide particles are investigated. Theoretical considerations from Mie theory and the optical properties of alumina give rise to inverse wavelength and λ−2 dependences when particles fall within the Rayleigh scattering regime. Analysis of particles of an arbitrary size (i.e. outside the Rayleigh regime) demonstrates that no general relationship exists between the wavelength and the spectral emissivity of these particles contrary to what has been routinely applied in the literature. This result was attributed to the dependence of both the spectral dependence and magnitude of the complex refractive index on the spectral emissivity. The significance of these results to applications (e.g. aluminized propellants) is discussed.

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Radiative characteristics of an aluminum dust flame. Condensed phase

Cited by 22 publications

References 6 publications

Spectral studies of the gas component of an aluminum dust flame

Spectral studies of the gas component of an aluminum dust flame

Aluminum Burn Rate Modifiers Based on Reactive Nanocomposite Powders

On the Origin and Use of the Emissivity Approximations for Alumina Particles

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