The Effects of Water on Blast From the Simultaneous Detonation of 180 152 mm Shells

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Abstract:

ARA was asked and funded by the Naval Facilities Engineering Service Center NFESC to perform calculations of the airblast resulting from the simultaneous detonation of 180 six inch 152 mm naval artillery shells. The calculations were run within the geometry of the KLOTZ Club tunnel test site at Alvdalen, Sweden. This geometry includes two crossing tunnels with a chamber at the end of each and a single tunnel entrance. A berm was constructed just outside the tunnel entrance to provide absorption and deflection of fragments. A test was conducted at this facility with 180 six-inch shells in 1989. In September of 1996 this test was repeated with 2000 kg of water in the vicinity of the detonation. Results of the two tests showed some surprises such as higher pressures near the tunnel entrance when water was present. ARA was asked to make detailed first principles calculations that included the effects of water on the airblast. SHAMRC was used to make several three dimensional calculations of the two tests. SHAMRC includes the detonation process, the effects of accelerating, heating and vaporizing the water and propagation of the resulting airblast. Previous experience at Alvdalen, Sweden and at Magdalena, New Mexico had shown us that the response of the walls of the detonation chamber could be an important energy absorbing mechanism for large charges but was ignored for this relatively small loading density. The initial conditions for the calculations used two planes of symmetry through the charge, thus the detonation of the explosive in an equivalent of only 45 shells 245 kg. was calculated. A bare charge calculation was run which ignored the effects of the steel casing of each shell. This calculation included three materials air, detonation products, and solid explosive. The results of this calculation provide the initial conditions for a series of calculations that included increasingly larger portions of the tunnel system. A second calculational series include

Author(s):
Crepeau, Joseph ; Needham, Charles
Author Organization(s):
APPLIED RESEARCH ASSOCIATES INC ALBUQUERQUE NM
Descriptive Note:
Conference proceedings
Supplementary Note:
See also ADM001002. Published in the Proceedings of the Twenty-Eighth DoD Explosives Safety Seminar Held in Orlando, FL on 18-20 August 1998. The original document contains color images.
Pagination:
0018

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NFESC
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_6.4.1_Secure Information Exchange; JCA_1.2.7_Experimentation; JCA_6.4_Information Assurance; JCA_6_Net Centric; JCA_8_Building Partnerships
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*TUNNELS, *WATER, *BLAST, *ARTILLERY AMMUNITION, *DETONATIONS, NAVY, PROJECTILES, AIRBORNE, DEFLECTION, HIGH PRESSURE, EXPLOSIVES, STEEL, THREE DIMENSIONAL, SYNCHRONISM, ABSORPTION, CROSSINGS, CHAMBERS, FRAGMENTS, SOLID PHASES, ENERGY ABSORBERS, COMBUSTION PRODUCTS, MODELS, COMPUTATIONS, SYMPOSIA, FIRST PRINCIPLES CALCULATIONS, REPRINTS, DENSITY
Field(s)/Group(s):
Ammunition and Explosives, Explosions
Keyword(s):
AIRBLAST, *NAVAL ARTILLERY SHELLS
Report Date:
1998 Aug 01
Creation Date:
2009 Jul 01