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Barometric calorimeter experiments with C4 charges

Kuhl A. L., Vandersall K., Howard W. M, Tringe J. W.

Archivum Combustionis

2013

Vol. 33 nr 1

41--56

Experiments were conducted in our 506-liter barometric calorimeter, to characterize the reflected blast wave environment from C-4 explosions. Charges were constructed as a C4 hemi-sphere and boosted by a LX-10 hemi-sphere. The charge was placed in the center of the calorimeter and initiated by an SE-1 detonator. The blast wave was measured by Kistler piezo-electric pressure gauges, located at 8 radii on the chamber lid. Six experiments were conducted: three in air, and three in nitrogen (to eliminate combustion effects). Blast waves in air arrived earlier than those in nitrogen. Reflected pressure impulses were 7% larger for the air experiments than for those in nitthereby quantifying the effects than combustion has on C4 blast waves. Late-time chamber pressures were measured with a Kulite piezo-resistive gauge. Measured chamber pressures were 2 times larger for the air experiments than for those in nitrogen-thereby quantifying the effects that C4-air combustion has on late-time pressures. Results were fit with analytic functions to establish scaling laws that show how the reflected blast wave pressures and impulses depend on charge mass and height of burst.