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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v7.i1.40
pages 55-71

COMBUSTION OF ALUMINUM FLAKES IN THE POST-FLAME ZONE OF A HENCKEN BURNER

Ryan W. Houim
The Pennsylvania State University, University Park, PA 16802, USA
Eric Boyd
The Pennsylvania State University, University Park, PA 16802, USA

RESUMO

Aluminum flakes have been used in propellants and explosives. The objective of this paper is to experimentally study the ignition and combustion behavior of aluminium flakes that have a thickness of 200 nm and a nominal diameter of 16 μm. Flakes with and without a thin coating of Teflon were studied. Teflon-coated Al flakes have a very strong tendency to agglomerate, up to four times their original size, resulting in a drastically increased particle burning time when compared to single aluminum flakes. Ignition of single flakes and agglomerates of Al flakes was observed at 1,800 K, which is about 300 to 500 K below the normal ignition temperature of aluminum. This observation also indicates that the ignition of agglomerates of Al flakes is governed by the heating process of a single flake. Under the same test conditions, single uncoated aluminum flakes exhibited two different burning modes; one mode produced a long, dim burning streak with combustion times on the order of 6 ms, the particles burning in the other mode showed vigorous reaction, producing a very short, bright burning streak with combustion times less than 1 ms. This phenomenon is believed to be governed by whether or not the Al flakes fragment during ignition process. The recovered samples from dimly burning particles are about the same diameter as the original flakes, but those recovered from the vigorously burning Al flakes showed much smaller sizes, indicating particle fragmentation. Measurements of combustion times of the intensely burning Al flakes are very close to measurements performed on nano-aluminum with a diameter of 192 nm performed by Parr et al. This agreement indicates the combustion times of intensely burning aluminum flakes are determined by the thickness rather than the diameter of the flake.

Referências

  1. Parr, T., Johnson, C., Hanson-Parr, D., Higa, K., and Wilson, K., Evaluation of Advanced Fuels for Underwater Propulsion.

  2. Price, E., Combustion of Metalized Propellants.

  3. Prentice, J., Combustion of Aluminum Droplets in Various Oxidizing Gases Including CO2 and Water Vapor.

  4. Beckstead, M.W., Correlating Aluminum Burning Times.

  5. Bayzn, T., Krier, H., and Glumac, N., Oxidizer and Pressure Effects on the Combustion of 10-μm Aluminum Particles.

  6. Servaites, J., Krier, H., Melcher, J., Burton, R., Ignition and Combustion of Aluminum Particles Shocked in H2O/O2/Ar and CO2/O2/Ar Mixtures.

  7. Bayzn, T., Krier, H., and Glumac, N., Combustion of Nanoaluminum at Elevated Pressure and Temperature Behind Reflected Shock Waves.

  8. Brossard, C., Ulas, A., Yeh, C.L., and Kuo, K.K., Ignition and Combustion of Isolated Aluminum Particles in the Post-Flame Region of a Flat-Flame Burner.


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