Combustion Characteristics of Condensed Phase Reactions in Sub-Centimeter Geometries
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 10, 2012
- Accession Number
- ADA566281
Entities
People
- Anthony P. Shaw
- Eric J. Miklaszewski
- Gary Chen
- Jay C. Poret
- Lori J. Groven
- Steven F Son
Organizations
- United States Army Armament Research, Development and Engineering Center