Particle velocity and stress measurements in low density HMX

Sheffield, S. A.; Alcon, R. R.; Gustavsen, R. L.; Graham, R. A.; Anderson, M. U.

doi:10.1063/1.46467

Cited by 14 publications

(9 citation statements)

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“…Computational modeling has shown the capability to capture the gas-solid flow physics in the granular regime. For instance, using the continuum mixture theory developed by Baer and Nunziato (1986), Baer (1997) accurately modeled the normal shock impingement studies of Sheffield et al (1994) and Anderson et al (1994).…”

Section: Introductionmentioning

confidence: 99%

A multiphase shock tube for shock wave interactions with dense particle fields

et al. 2012

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Currently there is a substantial lack of data for interactions of shock waves with particle fields having volume fractions residing between the dilute and granular regimes. To close this gap, a novel multiphase shock tube has been constructed to drive a planar shock wave into a dense gas-solid field of particles. A nearly spatially isotropic field of particles is generated in the test section by a gravity-fed method that results in a spanwise curtain of spherical 100-micron particles having a volume fraction of about 20%. Interactions with incident shock Mach numbers of 1.66, 1.92, and 2.02 are reported. High-speed schlieren imaging simultaneous with high-frequency wall pressure measurements are used to reveal the complex wave structure associated with the interaction. Following incident shock impingement, transmitted and reflected shocks are observed, which lead to differences in particle drag across the streamwise dimension of the curtain. Shortly thereafter, the particle field begins to propagate downstream and spread. For all three Mach numbers tested, the energy and momentum fluxes in the induced flow far downstream are reduced about 30-40% by the presence of the particle field.

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Section: Introductionmentioning

confidence: 99%

A multiphase shock tube for shock wave interactions with dense particle fields

et al. 2012

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“…For gas-solid flows where the particles are randomly packed (φ p greater than about 50%) the flow regime is said to be "granular." An example of such a flow would be the impingement of a normal shock on a pressed bed of explosive powders, such as in the experiments of Sheffield et al [8], and Anderson et al [9]. Simulations have shown promise in capturing the physics of shock-particle interactions in the granular regime.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Simulations have shown promise in capturing the physics of shock-particle interactions in the granular regime. For example, applying the continuum mixture theory developed by Baer and Nunziato [10], Baer [11] was able to successfully model the normal shock impingement studies of Sheffield et al [8], and Anderson et al [9].…”

Section: Literature Reviewmentioning

confidence: 99%

“…If an incident x-ray beam with intensity I 0 travels through a medium with density ρ and thickness w, the resulting intensity I is: (8) where A is the mass x-ray attenuation coefficient, which has been tabulated [40] for common materials. Thus if the attenuation coefficient and material properties of the medium are known, the total thickness of the medium can be computed.…”

Section: Particle Volume Fraction Measurementsmentioning

confidence: 99%

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Experimental characterization of energetic material dynamics for multiphase blast simulation.

Beresh¹,

Wagner²,

Kearney³

et al. 2011

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Currently there is a substantial lack of data for interactions of shock waves with particle fields having volume fractions residing between the dilute and granular regimes, which creates one of the largest sources of uncertainty in the simulation of energetic material detonation. To close this gap, a novel Multiphase Shock Tube has been constructed to drive a planar shock wave into a dense gassolid field of particles. A nearly spatially isotropic field of particles is generated in the test section by a gravity-fed method that results in a spanwise curtain of spherical 100-micron particles having a volume fraction of about 19%. Interactions with incident shock Mach numbers of 1.66, 1.92, and 2.02 were achieved. High-speed schlieren imaging simultaneous with high-frequency wall pressure measurements are used to reveal the complex wave structure associated with the interaction. Following incident shock impingement, transmitted and reflected shocks are observed, which lead to differences in particle drag across the streamwise dimension of the curtain. Shortly thereafter, the particle field begins to propagate downstream and spread. For all three Mach numbers tested, the energy and momentum fluxes in the induced flow far downstream are reduced about 30-40% by the presence of the particle field. X-Ray diagnostics have been developed to penetrate the opacity of the flow, revealing the concentrations throughout the particle field as it expands and spreads downstream with time. Furthermore, an X-Ray particle tracking velocimetry diagnostic has been demonstrated to be feasible for this flow, which can be used to follow the trajectory of tracer particles seeded into the curtain. Additional experiments on single spherical particles accelerated behind an incident shock 4 wave have shown that elevated particle drag coefficients can be attributed to increased compressibility rather than flow unsteadiness, clarifying confusing results from the historical database of shock tube experiments. The development of the Multiphase Shock Tube and associated diagnostic capabilities offers experimental capability to a previously inaccessible regime, which can provide unprecedented data concerning particle dynamics of dense gas-solid flows. 5

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“…Experimental Setup -The experimental setup for the low density HMX experiments has been described earlier (7,8). Briefly, gas gun driven projectiles were used to obtain planar sustainedshock inputs.…”

Section: Magnetic Gauge Experiments On Porous Hmxmentioning

confidence: 99%

Detonation wave profiles in HMX based explosives

Gustavsen¹,

Sheffield²,

Alcon³

1997

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LA-UR-97--2 9 9 2 Los Alamos National Laboratory, Los Alamos, NM 87545 Detonation wave profiles have been measured in several HMX based plastic bonded explosives including PBX9404, PBX9501, and EDC-37, as well as two HMX powders (coarse and fine) pressed to 65% of crystal density. The powders had 120 and 10 pm average grain sizes, respectively. Planar detonations were produced by impacting the explosive with projectiles launched in a 72-mm bore gas gun. Impactors, impact velocity, and explosive thickness were chosen so that the run distance to detonation was always less than half the explosive thickness. For the high density plastic bonded explosives, particle velocity wave profiles were measured at an explosive/window interface using two VISAR interferometers. PMMA windows with vapor deposited aluminum mirrors were used for all experiments. Wave profiles for the powdered explosives were measured using magnetic particle velocity gauges. Estimates of the reaction zone parameters were obtained from the profiles using Hugoniots of the explosive and window.

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Particle velocity and stress measurements in low density HMX

Cited by 14 publications

References 0 publications

A multiphase shock tube for shock wave interactions with dense particle fields

A multiphase shock tube for shock wave interactions with dense particle fields

Experimental characterization of energetic material dynamics for multiphase blast simulation.

Detonation wave profiles in HMX based explosives

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