Scaled experiments of explosions in cavities

Grun, J.; Cranch, G. A.; Lunsford, R.; Compton, S.; Walton, O. R.; Weaver, J.; Dunlop, W.; Fournier, K. B.

doi:10.1063/1.4948952

Title: Scaled experiments of explosions in cavities

Journal Article · Wed May 11 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4948952· OSTI ID:1256446

Grun, J. ^[1]; Cranch, G. A. ^[1]; Lunsford, R. ^[2]; Compton, S. ^[3]; Walton, O. R. ^[3]; Weaver, J. ^[1]; Dunlop, W. ^[3]; Fournier, K. B. ^[3]

Naval Research Lab., Washington, D.C. (United States)
Naval Research Lab., Washington, D.C. (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Consequences of an explosion inside an air-filled cavity under the earth's surface are partly duplicated in a laboratory experiment on spatial scales 1000 smaller. The experiment measures shock pressures coupled into a block of material by an explosion inside a gas-filled cavity therein. The explosion is generated by suddenly heating a thin foil that is located near the cavity center with a short laser pulse, which turns the foil into expanding plasma, most of whose energy drives a blast wave in the cavity gas. Variables in the experiment are the cavity radius and explosion energy. Measurements and GEODYN code simulations show that shock pressuresmeasured in the block exhibit a weak dependence on scaled cavity radius up to ~25 m/kt^1/3, above which they decrease rapidly. Possible mechanisms giving rise to this behavior are described. As a result, the applicability of this work to validating codes used to simulate full-scale cavityexplosions is discussed.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1256446

Report Number(s):: LLNL-JRNL-683997; JAPIAU

Journal Information:: Journal of Applied Physics, Vol. 119, Issue 18; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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