Prediction of explosive cylinder tests using equations of state from the PANDA code

Kerley, Gerald I.; Christian-Frear, T.L.

doi:10.2172/10115447

Cited by 11 publications

(9 citation statements)

References 5 publications

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“…The unreacted NM equation of state (EOS) used was a Mie−Gruneisen form (based on the shock properties) with a constant specific heat and mass density times Gruneisen parameter product. The NM reaction product EOS was a tabular form and was based on a mixture chemical equilibrium model that simulates detonation cylinder expansion experiments …”

Section: Fluid Dynamic Modeling Of the Experimentsmentioning

confidence: 99%

Mass Spectroscopic Study of the Chemical Reaction Zone in Detonating Liquid Nitromethane

1997

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We report a time-of-flight mass spectroscopic study of the chemical reaction zone in base-sensitized detonating liquid nitromethane (NM--CH3NO2). Mass spectra of the reaction zone region are presented for cases where the CH3NO2, 13CH3NO2, and CD3NO2 forms of NM were detonated. In experiments in which detonation was made to occur, the detonation process was initiated by a slapper detonator system. The NM explosives were confined in steel, and the charge geometry was chosen such that the detonations were traveling steadily by the time the detonation wave reached the end of the charge. Various nondetonation control experiments were also performed and are described. Two-dimensional numerical fluid-dynamic computations that mimic the experimental system were performed in order to help in the interpretation. We estimate that, for the base-sensitized NM explosive used, the steady two-dimensional chemical-reaction zone is ca. 50 μm in spatial extent and has a time duration of ca. 7 ns. The most important result obtained is that the new chemical species that are observed in the reaction zone are the result of condensation reactions where two or more NM molecules combine to form molecules more massive than NM or produce molecules in which numerous nitrogen atoms are present. A brief review of earlier work on this problem is presented to aid readers in understanding the new results.

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Section: Fluid Dynamic Modeling Of the Experimentsmentioning

confidence: 99%

Mass Spectroscopic Study of the Chemical Reaction Zone in Detonating Liquid Nitromethane

1997

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“…Because of its high melting point, low thermal expansion, and high heat capacity, graphite is often used in structural materials and composites, as in heat shields for space reentry vehicles. In addition to its importance as a pure material, there has been considerable interest in carbon because of its formation in the detonation products of explosives and in the decomposition products of hydrocarbons, plastics, and other compounds [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Multicomponent-Multiphase Equation of State for Carbon

Kerley¹,

Chhabildas²

2001

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The PANDA code is used to build a tabular equation of state (EOS) table for carbon. The model includes three solid phases (graphite, diamond, and metallic) and a fluid phase mixture containing three molecular components (C 1 , C 2 , and C 3). Separate EOS tables were first constructed for each solid phase and for each molecular species in the fluid phase. Next, a mixture/chemical equilibrium model was used to construct a single multicomponent EOS table for the fluid phase from those for the individual chemical species. Finally, the phase diagram and multiphase EOS were determined from the Helmholtz free energies. The model gives good agreement with experimental thermophysical data, static compression data, known phase boundaries, and shock-wave measurements. This EOS covers a wide range of densities (0-100 g/cm 3) and temperatures (0-1.0×10 8 K). The new EOS table can be accessed through the SNL-SESAME library as material number 7830.

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“…b. The Sesame 8050 table of Kerley for TATB detonation products, which is ALEGRA's recommended EOS model [12]. c. The LMD Lexan electrical conductivity model, modified by a constant scaling factor sc = 0.1, reducing the electrical conductivity uniformly during the ALEGRA simulation.…”

Section: A1 Approximations For Tatb Materials Configurationmentioning

confidence: 99%

Radiation-MHD simulations for the development of a spark discharge channel.

Niederhaus

Jorgenson

Warne

et al. 2017

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The growth of a cylindrical spark discharge channel in water and Lexan is studied using a series of one-dimensional simulations with the finite-element radiation-magnetohydrodynamics code ALEGRA. Computed solutions are analyzed in order to characterize the rate of growth and dynamics of the spark channels during the rising-current phase of the drive pulse. The current ramp rate is varied between 0.2 and 3.0 kA/ns, and values of the mechanical coupling coefficient Kp are extracted for each case. The simulations predict spark channel expansion velocities primarily in the range of 2000 to 3500 m/s, channel pressures primarily in the range 10-40 GPa, and Kp values primarily between 1.1 and 1.4. When Lexan is preheated, slightly larger expansion velocities and smaller Kp values are predicted, but the overall behavior is unchanged.

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Prediction of explosive cylinder tests using equations of state from the PANDA code

Cited by 11 publications

References 5 publications

Mass Spectroscopic Study of the Chemical Reaction Zone in Detonating Liquid Nitromethane

Mass Spectroscopic Study of the Chemical Reaction Zone in Detonating Liquid Nitromethane

Multicomponent-Multiphase Equation of State for Carbon

Radiation-MHD simulations for the development of a spark discharge channel.

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