Airblast effects research : small-scale experiments and calculations
Joachim, Charles E.; McMahon, Gordon W.; Lunderman, Christo V.; Garner, Sharon B.
Technical ReportAbstract: A series of 1:15-scale model experiments were conducted to investigate the effects of loading density on the dynamic airblast flow parameters produced by spherical charge detonations in an underground ammunition storage magazine (shotgun design). Chamber loading densities ranged from 0.4 to 5.0 kg/cubic meter (TNT Equivalent). Total pressure measurements were made on the center line of the model access tunnel using a miniaturized, probe-type, pressure mount. Side-on and total pressure measurements provide the data required to quantify the pressure regime at these locations within the model. The data also provide an estimate of the dynamic flow regime. Calculations for a full-scale magazine were performed using the CTH hydrocode. Comparisons of the CTH calculated full-scale pressure waveforms with the scaled-up recorded waveforms are excellent. Detonations in an underground magazine are confined so that the blast wave follows a restricted flow path to the portal. Comparisons of the measured and calculated pressures show that this confinement drastically increases the pressures of the blast wave by an order of magnitude or more above that produced in the free field by the same explosion source.
Structures Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Airblast impulse; Airblast total pressure; CTH hydrocode calculations; Overpressure; Underground magazine; Blasts; Explosions; Blast effects; Explosion effects
Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-99-5.
Approved for public release; distribution is unlimited.