Enhancing the propagation velocity of a flame front in an aluminum aerosuspension

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This paper gives a brief review of methods for modifying metallic fuels for composite solid propellants, including the application of coatings onto aluminum particles (encapsulation). Requirements for the coating material are formulated. By means of thermodynamic calculations, it is shown that some fluorine-containing coatings reduce the content of the condensed phase in the propellant combustion products without decreasing the specific impulse. A mathematical model for the ignition of a single encapsulated particle is proposed. Calculations show a decrease in the ignition time of an aluminum particle with a fluorine-containing coating.

Section: Results Of Mathematical Modelingsupporting

confidence: 85%

Ignition, combustion, and agglomeration of encapsulated aluminum particles in a composite solid propellant. I. Theoretical study of the ignition and combustion of aluminum with fluorine-containing coatings

Yagodnikov

Andreev

Воробьев

et al. 2006

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“…Aluminum powders with the corresponding coatings were produced at the Semenov Institute of Chemical Physics and the Bauman Moscow State Technical University. The combustion of air suspensions of these powders has been studied previously [2]. Some coatings provided a significant increase in the velocity of flame propagation over the air suspensions.…”

Section: Model Propellants: Formulations and Ingredientsmentioning

confidence: 99%

Ignition, combustion, and agglomeration of encapsulated aluminum particles in a composite solid propellant. II. Experimental studies of agglomeration

Глотов

Yagodnikov

Воробьев

et al. 2007

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The combustion characteristics of propellants containing AP, HMX, an energetic binder, and aluminum particles with various polymer coatings are studied at pressures of 0.15 and 4.6 MPa. It is found that the coatings influence the burning rate, the particle size distribution of condensed combustion products, and the completeness of aluminum combustion. It is shown that the agglomeration can be reduced by using aluminum with fluorine-containing coatings. The application of some coatings results in a reduction in the mass of the agglomerates with an insignificant increase in their size. The greatest effect was achieved when using aluminum coated with (CH 2 CH CH 2 O) 2 Si[OCH 2 (CF 2 CF 2 ) 2 H] 2 [bis(allyloxy)-bis(2,2,3,3,4,4,5,5-octafluoropentyloxy)silane]. For this coating, a size reduction is also observed for micron-size oxide particles.

“…These additives to the fuel composition reduce particle agglomeration during combustion, increase the combustion completeness and the maximum temperature of the flame [3]. In [8], ASD-4 powder was modified by fluorine-containing polymer films and the combustion of aerosols of this powder was studied. The application of fluorine-containing coatings reduced the ignition induction period of the aluminum particles and increased the reactivity of the powder, resulting in an increase in the burning rate of the aerosol.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, in studies of the effect of additives on the combustion of coarse aluminum particles in air, the composition of the combustion products, as a rule, has not been analyzed. An exception is the studies of [8][9][10], in which the phase composition of the products from aluminum combustion in air was examined using various methods. Thus, Yagodnikov et al [9], using the ASTRA program, calculated the thermodynamic combustion temperature and relative mass concentration of condensed combustion products of enriched aerosols.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of additives on the combustion of coarse aluminum powders in air has been the subject of extensive research [1,[3][4][5][6][7][8][9]. Pokhil et al [1] studied the kinetic and thermal characteristics of combustion of Al-Mg alloy particles in air and found that the end combustion products contain a significant amount of Al 2 MgO 4 spinel in addition to ordinary oxides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitride Formation during Combustion of Ultrafine Aluminum Powders in Air. I. Effect of Additives

Gromov

Popenko

Sergienko

et al. 2005

This paper summarizes the results from studies of the effect of 17 additives on the process and products of ultrafine aluminum combustion in air. It is shown that the additives influence the temperature and duration of the combustion process and the structure of the end products, including the yield of aluminum nitride. The major factor determining the yield of aluminum nitride is the maximum temperature reached in combustion of mixtures of ultrafine aluminum powder with definite additives.