Dispersion of the detonation products of a condensed explosive with solid inclusions

Lanovets, V. S.; Levich, V. A.; Rogov, N. K.; Tunik, Yu. V.; Shamshev, K. N.

doi:10.1007/bf00783721

Cited by 17 publications

(9 citation statements)

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“…Therefore, there will exist an intermediate range of particle sizes for which the inertia of the particles combined with the decay of the blast wave produces a "sling-shot" effect in which the particles catch up with and penetrate the combustion products contact surface and, in some cases, overtake the primary shock front. Lanovets et al (1991) performed preliminary numerical simulations for spherical charges and reported that the solid particles can, for a certain range of particle size and density, cross the explosion products and overtake the primary shock front.…”

Section: Introductionmentioning

confidence: 99%

Explosive dispersal of solid particles

Zhang¹,

et al. 2001

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The rapid dispersal of inert solid particles due to the detonation of a heterogeneous explosive, consisting of a packed bed of steel beads saturated with a liquid explosive, has been investigated experimentally and numerically. Detonation of the spherical charge generates a blast wave followed by a complex supersonic gas-solid flow in which, in some cases, the beads catch up to and penetrate the leading shock front. The interplay between the particle dynamics and the blast wave propagation was investigated experimentally as a function of the particle size (100-925 µm) and charge diameter (8.9-21.2 cm) with flash X-ray radiography and blast wave instrumentation. The flow topology during the dispersal process ranges from a dense granular flow to a dilute gas-solid flow. Difficulties in the modeling of the high-speed gas-solid flow are discussed, and a heuristic model for the equation of state for the solid flow is developed. This model is incorporated into the Eulerian two-phase fluid model of Baer and Nunziato (1986) and simulations are carried out. The results of this investigation indicate that the crossing of the particles through the shock front strongly depends on the charge geometry, the charge size and the material density of the particles. Moreover, there exists a particle size limit below which the particles cannot penetrate the shock for the range of charge sizes considered. Above this limit, the distance required for the particles to overtake the shock is not very sensitive to the particle size but remains sensitive to the particle material density. Overall, excellent agreement was observed between the experimental and computational results.

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Section: Introductionmentioning

confidence: 99%

Explosive dispersal of solid particles

Zhang¹,

et al. 2001

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“…The size distribution and initial position of unburned residue explosive material is a priori unknown and it is very difficult, if at all possible, to simulate the detonation process sufficiently detailed or designing an experiment setup, to generate accurate predictions. Some experiments have been conducted based on a packed bed of inert solid particles moulded around a spherical explosive charge and it is the velocities of these which are reported rather than the unreacted particles of the explosive material itself 93,94 . Detailed information on unreacted particles is therefore sparse.…”

Section: Source Modellingmentioning

confidence: 99%

Post-blast explosive residue – a review of formation and dispersion theories and experimental research

et al. 2014

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“…Lanovets et al [5] undertook the first numerical simulation of a heterogeneous explosive charge comprising of inert metal particles, by using a one-dimensional approach and showed that the solid particles can overtake the leading blast wave under certain conditions. Zhang et al [1] carried out experimental and numerical studies to obtain the shock front and the particle cloud trajectory for a nitromethane charge containing steel particles.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Mixing Layer Resulting from the Detonation of Heterogeneous Explosive Charges

Balakrishnan

Menon

2011

Flow Turbulence Combust

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A dense, two-phase numerical methodology is used to study the mixing layer developing behind the detonation of a heterogeneous explosive charge, i.e., a charge comprising of a high explosive with metal particles. The filtered NavierStokes equations are solved in addition to a sub-grid kinetic energy equation, along with a recently developed Eulerian-Lagrangian formulation to handle dense flowfields. The mixing layer resulting from the post-detonation phase of the explosion of a nitromethane charge consisting of inert steel particles is of interest in this study. Significant mixing and turbulence effects are observed in the mixing layer, and the rms of the radial velocity component is found to be about 25% higher than that of the azimuthal and zenith velocity components due to the flow being primarily radial. The mean concentration profiles are self-similar in shape at different times, based on a scaling procedure used in the past for a homogeneous explosive charge. The peak rms of concentration profiles are 23-30% in intensity and decrease in magnitude with time. The behavior of concentration gradients in the mixing layer is investigated, and stretching along the radial direction is observed to decrease the concentration gradients along the azimuth and zenith directions faster than the radial direction. The mixing and turbulence effects in the mixing layer subsequent to the detonation of the heterogeneous explosive charge are superior to that of a homogeneous explosive charge containing the same amount of the high explosive, exemplifying the role played by the particles in perturbing the flow-field. The nonlinear growth of the mixing layer width starts early for the heterogeneous explosive charge, and the rate is reduced during the implosion phase in comparison with the homogeneous charge. The turbulence intensities in the mixing layer for the

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Dispersion of the detonation products of a condensed explosive with solid inclusions

Cited by 17 publications

References 0 publications

Explosive dispersal of solid particles

Explosive dispersal of solid particles

Post-blast explosive residue – a review of formation and dispersion theories and experimental research

Characterization of the Mixing Layer Resulting from the Detonation of Heterogeneous Explosive Charges

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