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Accession Number ADA566281
Title Combustion Characteristics of Condensed Phase Reactions in Sub- Centimeter Geometries.
Publication Date Jun 2012
Media Count 10p
Personal Author A. P. Shaw E. J. Miklaszewski J. C. Poret L. J. Groven S. F. Son
Abstract In this work, the combustion characteristics of the exothermic systems Ti/C, Ni/Al, 3Ni/Al and combinations thereof, are examined in small diameter aluminum tubes (3-6 mm ID). Tailoring the overall exothermicity of the reactant system is accomplished by varying the reaction combination, stoichiometry, and the addition of alumina as a diluent. For the combined reactive system, Ti/C-3Ni/Al, it is shown that at 40 wt.% Ti/C content, the failure diameter lies between 3 and 4 mm. While at a Ti/C content of 30 wt.%, complete combustion front propagation is only observed for tube diameters of 6 mm. For the more exothermic system, Ti/C-Ni/Al, studied at a diameter of 4.8 mm, the addition of low levels of alumina as a diluent is shown to drastically alter the combustion front velocity, resulting in extinction with an increase from 2 to 2.5 wt.% addition. The addition of a thermal barrier (Grafoil trademark) for Ti/C-Ni/Al (15/85 wt.%) diluted with 2 wt.% Al2O3, results in an increase in propagation rate and the range of packing densities that complete propagation is observed; the effects of GrafoilTM on the reactive composition Ti/C-3Ni/Al (35/65 wt.%) are not as pronounced.
Keywords Aluminum alloys
Combustion
Exothermic reactions
Geometry
Thermal insulation
Time delay fuzes


 
Source Agency Non Paid ADAS
NTIS Subject Category 72B - Algebra, Analysis, Geometry, & Mathematical Logic
81A - Combustion & Ignition
Corporate Author Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ. Pyrotechnics Technology and Prototyping Div.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1306
Contract Number N/A

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