Combustion and ignition of particles of finely dispersed aluminum

Belyaev, A. F.; Frolov, Yu. V.; Korotkov, A. I.

doi:10.1007/bf00750857

Cited by 48 publications

(28 citation statements)

References 4 publications

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“…Agreement is satisfactory and prediction errors are less than 10%. According to the Belyaev et al [47], the QSC duration less depends on the ambient gas temperature because the heat of aluminum oxidation reaction is high and it commands the combustion. In Table 5, the predicted burning durations are almost unchanged at different ambient gas temperatures.…”

Section: Resultsmentioning

confidence: 99%

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Yang

Yoon

2010

J Mech Sci Technol

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A simplified analytical modeling of single aluminum particle combustion was conducted. Ignition and quasi-steady combustion (QSC) were separately formulated and integrated. Both the heat transfer from the hot ambient gas and the enthalpy of heterogeneous surface reaction (HSR) served to cause the particle ignition. Conservation equations were solved for QSC parameters in conjunction with conserved scalar formulation and Shvab-Zeldovich function. Limit temperature postulate was formulated by a sink term pertinent to the dissociation of the aluminum oxide near the flame zone. Effective latent heat of vaporization was modified for the thermal radiation. Ignition and QSC of the aluminum particle were predicted and discussed with emphasis on the effect of the aluminum oxide and variable properties. The model was validated with the experiments regarding ignition delay time, burning rate, residue particle size, flame temperature, QSC duration, and stand-off distance of the envelop flame. Agreement was satisfactory and the prediction errors were limited within 10%.

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Section: Resultsmentioning

confidence: 99%

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Yang

Yoon

2010

J Mech Sci Technol

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“…The characteristic burnup time of the metal particle t b will be determined from the experimental dependence [10] b 0.9 ,…”

Section: Introductionmentioning

confidence: 99%

Optimum Distribution of Metal Particles in the Solid-Propellant Charge in the Approximation of a One-Dimensional Flow Field in a Cylindrical Channel

Minkov

Shrager

2015

J Eng Phys Thermophy

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A study has been made of ways of optimum distribution of particles of dispersed metal in the solid-propellant charge with a cylindrical central channel, which is fi rmly fastened to the case. The effi ciency of combustion of this metal has been analyzed. Consideration has been given to the infl uence of the dynamic nonequilibrium of two-phase fl ow on the optimum distribution of metal particles in the indicated charge in the approximation of one-dimensionality of the fl ow fi eld. Introduction.One key problem in designing solid-propellant rocket engines (SPREs) is to raise the energy efficiency of the propellant. Composite solid propellants widely used in SPREs at present contain such metals as aluminum, magnesium, and beryllium as fuel additions. These additions contribute to the increase in the specifi c momentum and to the improvement of the combustion stability of a solid propellant.It is common knowledge that metal additions, on the one hand, lead to an improvement of the energy characteristics of a composite solid propellant owing to their high combustion temperature, and, on the other, are the source of the specific-momentum loss by the incomplete combustion of metal particles and of their velocity lag behind the gas phase, particularly in the case of small SPREs and SPREs without a nozzle. The specifi c-momentum loss by incomplete combustion can be decreased due to the redistribution of metal particles inside the solid-propellant charge in accordance with structural features of the charge and the SPRE.It is as early as 40 years ago that investigations started to address the problem of increasing specifi c momentum due to the redistribution of metal inside a solid-propellant charge. For example, in Japan in 1976, a patent was registered for a solid-fuel composition, in which the redistribution of metal inside the charge in the form of a cylindrical cartridge with a channel was implemented through a change in the particles size [1]. It was demonstrated that for a solid-propellant charge with a 5 to 30 ratio between the channel′s length and its diameter, the redistribution of particles by size (the fi rst 44% of the charge length is occupied by particles of size 50-150 μm, the second 28%, by particles of size 20-50 μm, and the third 28%, by particles with a size smaller than 20 μm) can ensure an increase of 4-7% in the momentum compared to the uniform distribution of all the particles in the solid-propellant charge. The specifi c momentum can also be increased through the redistribution of metal due to the change in its mass fraction. The infl uence of the redistribution of metal particles by mass fraction on their combustion effi ciency was investigated numerically in [2] under the assumption that the mass fraction of the metal particles z(X) varies linearly along the channel. It was shown that there is an optimum slope of the z(X) straight line, which ensures the maximum combustion effi ciency for a prescribed mass of metal in the propellant charge. The combustion effi ciency of aluminum in an SPRE was ana...

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“…Micron-sized aluminum powders are often added into various energetic materials, including pyrotechnics, explosives, and rocket propellants. It is because that the performance of energetic materials can be highly improved such as the oxidation enthalpy and the combustion temperature, especially the motor acoustic stability [1][2][3][4] In recent several decades, basic understanding of aluminum combustion mechanisms has been improved significantly in experimental and theoretical investigations [5][6][7][8][9]. However, it is difficult to determine the accurate reactive mechanism because the different properties of aluminum powders, for instance, the specific surface area, particle size and distribution, different synthetic methods, environment condition, core@shell structure of aluminum powder [10,11] will eventually influence the oxidation mechanism of aluminum.…”

Section: Introductionmentioning

confidence: 99%

Oxidation mechanism of micron-sized aluminum particles in Al-CO₂ gradually heating system

Liu

Ren

Jiao

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Combustion and ignition of particles of finely dispersed aluminum

Cited by 48 publications

References 4 publications

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Optimum Distribution of Metal Particles in the Solid-Propellant Charge in the Approximation of a One-Dimensional Flow Field in a Cylindrical Channel

Oxidation mechanism of micron-sized aluminum particles in Al-CO₂ gradually heating system

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Combustion and ignition of particles of finely dispersed aluminum

Cited by 48 publications

References 4 publications

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Modeling of aluminum particle combustion with emphasis on the oxide effects and variable transport properties

Optimum Distribution of Metal Particles in the Solid-Propellant Charge in the Approximation of a One-Dimensional Flow Field in a Cylindrical Channel

Oxidation mechanism of micron-sized aluminum particles in Al-CO2 gradually heating system

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Oxidation mechanism of micron-sized aluminum particles in Al-CO₂ gradually heating system