Aluminum Agglomeration in Solid-Propellant Combustion

Sambamurthi, J.K.; Price, E. W.; Sigmant, Robert K.

doi:10.2514/3.48552

Cited by 142 publications

(53 citation statements)

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“…The mean-mass size of agglomerates predicted by the pocket model turns out to be proportional to the AP particle size. For traditional HCSs with AP particles from 100 to 400 µsec, this result is in good agreement with the experimental data of [1][2][3][4][5][6][7][8][9]. In accordance with this model, the decrease in the mean-mass size of AP particles should be accompanied by a proportional decrease in the mean-mass size of agglomerates.…”

Section: Introductionsupporting

confidence: 88%

“…In accordance with this model, the decrease in the mean-mass size of AP particles should be accompanied by a proportional decrease in the mean-mass size of agglomerates. At the same time, it was found [7] that the opposite dependence is observed for PA particles smaller than 50 µm: the mean-mass size of agglomerates increases with decreasing mean-mass size of PA particles. Moreover, the pocket model is absolutely inapplicable to quasihomogeneous compositions, such as HCSs with ultrafine PA particles, and to metallized ballistite powders; the model predicts the absence of agglomeration in these systems, which contradicts available experimental data on combustion of aluminized ballistite powders [1].…”

Section: Introductionmentioning

confidence: 94%

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Statistical simulation of aluminum agglomeration during combustion of heterogeneous condensed mixtures

Rashkovskii

2005

Combust Explos Shock Waves

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A statistical model of aluminum agglomeration during combustion of solid composite rocket propellants is considered; the model describes the process dynamics, beginning from propellant heating in the combustion wave and ending by separation of agglomerates from the burning surface. An algorithm of computing the agglomeration process by the Monte Carlo method is proposed. A series of computations of aluminum agglomeration is performed; the density distribution functions for agglomerate sizes are derived; the dependence of the mean-mass size of agglomerates on the mean-mass size of ammonium-perchlorate particles is determined. The model proposed predicts power dependences of the mean-mass size of agglomerates on pressure and burning rate, which agrees with available experimental data.

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Section: Introductionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 94%

Statistical simulation of aluminum agglomeration during combustion of heterogeneous condensed mixtures

Rashkovskii

2005

Combust Explos Shock Waves

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“…The quench collection setup is a stainless steel pressure vessel containing a collecting vessel inside it [2,15]. The collecting vessel is filled with ethanol [18].…”

Section: Burning Rate Measurementmentioning

confidence: 99%

“…It is greatly influenced by the propellant flame structure and, in turn, influences the propellant burning rate. Sambamurthi et al [15] showed that the leading edge of the flame (LEF) formed by exothermal interaction of the gaseous products of thermal decomposition of AP and the polymer binder in the combustion zone of a composite propellant is a source of ignition of aluminium particles accumulating on the propellant burning surface. Price [16] gave details on different roles of LEFs in propellant combustion, including the process of metal ignition.…”

Section: Introductionmentioning

confidence: 99%

Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Jayaraman

Chakravarthy

Sarathi

2010

Combust Explos Shock Waves

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Nano-aluminium particles are produced using the electric wire explosion process in an inert atmosphere at our institute. This paper reports the characterization of nanoaluminium particles in combination with other solid propellant ingredients for their thermal and combustion behaviour. High-heating-rate hot-stage microscopic experiments are performed with different mixtures of propellant ingredients. The effects of addition of nano-aluminium versus micron-sized aluminium in the middle lamina of sandwiches are analyzed for burning rates and by means of scanning electron microscope and transmission electron microscope micrographs of quench-collected aluminium agglomerates. Nano-aluminized sandwiches with thinner middle lamina show slightly higher burning rates than micron-sized aluminized ones. The quenched surface of nano-aluminized sandwiches shows relatively smaller aluminium agglomerates than with micron-sized aluminium. The resultant particle sizes of nano-aluminium agglomerates is in the range of 1-5 µm, which indicates a higher rate of agglomeration than with micro-aluminium, but these sizes are small relative to the agglomerates of the latter. This is also confirmed by quench-collected agglomerates of nano-aluminium emerging from the burning surface of a composite propellant.

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“…As far as we know, only the work [1] reported Al content vs. particle size. They similarly found a one-to-one correspondence between size and free Al fraction.…”

Section: Particle Sievingmentioning

confidence: 99%

Detailed analysis of a quench bomb for the study of aluminum agglomeration in solid propellants

Gallier¹,

Kratz²,

Quaglia³

et al. 2016

Progress in Propulsion Physics

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A standard quench bomb (QB) ¡ widely used to characterize condensed phase from metalized solid propellant combustion ¡ is studied in detail. Experimental and numerical investigations proved that collected particles are mostly unburned aluminum (Al) agglomerates despite large quenching distances. Particles are actually found to quench early as propellant surface is swept by inert pressurant. Further improvements of the QB are proposed which allow measuring both Al agglomerates and alumina residue with the same setup. Finally, the results obtained on a typical aluminized ammonium perchlorate (AP) / hydroxyl-terminated polybutadiene (HTPB) propellant are brie §y discussed.

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Aluminum Agglomeration in Solid-Propellant Combustion

Cited by 142 publications

References 1 publication

Statistical simulation of aluminum agglomeration during combustion of heterogeneous condensed mixtures

Statistical simulation of aluminum agglomeration during combustion of heterogeneous condensed mixtures

Accumulation of nano-aluminium during combustion of composite solid propellant mixtures

Detailed analysis of a quench bomb for the study of aluminum agglomeration in solid propellants

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