Accession Number:

ADA566281

Title:

Combustion Characteristics of Condensed Phase Reactions in Sub-Centimeter Geometries

Descriptive Note:

Corporate Author:

ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ PYROTECHNICS TECHNOLOGY AND PROTOTYPING DIV

Personal Author(s):

• Miklaszewski, Eric J.
• Son, Steven F.
• Groven, Lori J.
• Poret, Jay C.
• Shaw, Anthony P.
• Chen, Gary

Report Date:

2012-06-10

Pagination or Media Count:

10.0

Abstract:

In this work, the combustion characteristics of the exothermic systems TiC, NiAl, 3NiAl 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, TiC-3NiAl, it is shown that at 40 wt. TiC content, the failure diameter lies between 3 and 4 mm. While at a TiC content of 30 wt., complete combustion front propagation is only observed for tube diameters of 6 mm. For the more exothermic system, TiC-NiAl, 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 TiC-NiAl 1585 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 TiC-3NiAl 3565 wt. are not as pronounced.

Descriptors:

• *COMBUSTION
• ALUMINUM ALLOYS
• EXOTHERMIC REACTIONS
• GEOMETRY
• THERMAL INSULATION
• TIME DELAY FUZES

Subject Categories:

• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE