Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502

Short, Mark; Chiquete, Carlos; Bdzil, J. B.; Quirk, J. P.

doi:10.1016/j.combustflame.2018.06.002

Cited by 18 publications

(7 citation statements)

References 18 publications

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“…19). This is indicative of an insensitive explosive although it should be noted that the fast scale is about four or five times finer than the similar scale for 9502 [49]. This feature is fundamentally tied to the relatively low gradient of the diameter effect data for PBX 9701 relative to PBX 9502 and this necessitates a faster reaction to accommodate this apparent trend in the data.…”

Section: Znd Profilementioning

confidence: 86%

“…As noted in section 3.2.3, the thermodynamic closure changes the reaction structure for fixed EOS and reaction rate model parameter sets. Short et al [49] previously found that the change was not dramatic however, especially in terms of the ZND profile and the diameter effect curve.…”

Section: Effect Of Closurementioning

confidence: 91%

“…This observation provided the impetus in [49] A slightly different story holds for simulations of the gas gun experiments which populate the initiation rate terms.…”

Section: Effect Of Closurementioning

confidence: 99%

“…The calibration of the propagation rate terms and parameters is dependent on the unconfined ratestick tests which provide a measure of the effect of flow divergence on the steady-state multi-dimensional reaction zone. The computational technique we use to determine the phase velocities and front shapes for comparison to the recorded unconfined data is a shock-attached approach[21,20,48,47] with the specific algorithmic methods described in[12,50,49]. This approach provides a more efficient means to determine this comparative data and importantly, avoids the use of more complex multimaterial simulations to obtain this key data.The same exact experimental measurements are used in…”

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confidence: 99%

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Detonation performance experiments and modeling for the DAAF-based high explosive PBX 9701

Chiquete

Jackson

Short

2021

Combustion and Flame

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Detonation performance experiments and modeling are reported for the explosive PBX 9701, which is composed of 97% 3,3-diamino-4,4-azoxyfurazan (DAAF) and 3% vinylidene fluoride-chlorotrifluoroethylene copolymer (Kel-F 800) binder by weight. PBX 9701 is a newly-developed reducedsensitivity explosive with increased performance relative to the triaminotrinitrobenzene or TATB-based PBX 9502 while still retaining low sensitivity to mechanical insult. The first detonation performance measurements for this formulation are presented, including front-curvature ratesticks and cylinder expansion test data. Prior shock initiation data is also reviewed. These data are used to develop programmed burn and reactive flow calibrations for existing commonly-used performance models which allow engineering calculations with PBX 9701. The calibration process involves several enhancements relative to conventional approaches including the use of an analytical scaling correlation to speed the calibration process and development of a new methodology to improve the consistency between the programmed burn and reactive model calibration process and the resulting calculations. Overall, PBX 9701 is seen to exhibit improved performance relative to insensitive explosives, with a trinitrotoluene (TNT) equivalence of 1.24. The detonation performance properties are found to be well captured by existing models.

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Section: Znd Profilementioning

confidence: 86%

Section: Effect Of Closurementioning

confidence: 91%

“…This observation provided the impetus in [49] A slightly different story holds for simulations of the gas gun experiments which populate the initiation rate terms.…”

Section: Effect Of Closurementioning

confidence: 99%

mentioning

confidence: 99%

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Detonation performance experiments and modeling for the DAAF-based high explosive PBX 9701

Chiquete

Jackson

Short

2021

Combustion and Flame

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“…This results in an iterative scheme to compute the pressure. In Short et al , pressure and specific volume

(() v = v_{r} = v_{p})

equilibrium was assumed since the temperature was not needed as part of their solution method. This allowed for the pressure to be determined explicitly without an iteration scheme, which resulted in significant computational savings.…”

Section: Basic Modelmentioning

confidence: 99%

Multiscale Approach to Shock to Detonation Transition in Energetic Materials

Jackson

Short

2019

Propellants Explo Pyrotec

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In this work we present a multiscale approach for coupling the dynamics of void collapse at the microscale to simulations at the mesoscale. We solve the reactive Euler equations, with the energy equation augmented by a power deposition term. The reaction rate at the mesoscale is modelled using a pressure‐dependent power law. The deposition term is based on previous simulations of void collapse, modelled at the mesoscale as hot‐spots. The equation of state was previously calibrated for PBX 9501. The run‐to‐detonation distance is calculated as part of the numerical solution procedure. Results for 1‐D, 2‐D homogeneous, and 2‐D heterogeneous medium are presented, and show good agreement to experimental data.

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A simplified burn model for simulating explosive effects and afterburning

Houim

2021

Shock Waves

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A simplified burn model (SBM) was developed for use in simulating the effects of explosive detonations. The goal of SBM is to provide a subgrid model for detonation propagation on grids that are many times coarser than the physical width of the reaction zone. Similar to traditional programmed burn (PB), SBM provides accurate enough initial conditions for simulating largescale blasts and afterburning processes resulting from the detonation. The governing equations are based on the five-equation compressible multiphase flow model that describes reaction and post-detonation processes similar to reactive burn models. The model uses highly simplified reactant equations of state and reaction rate laws. The reaction model is based on burning rates from traditional PB approaches and is designed to spread the reaction zone over a small number of grid points regardless of the mesh resolution. The detonation velocity and state are independent of the input parameters for the reactant equation of state and reaction model, provided the inputs are physically realistic. The single input parameter for the equation of state must be selected such that the reactant and product Hugoniot curves do not cross, otherwise unphysical weak detonations result. Numerical experiments show that the velocity, state, and bulk structure of Chapman-Jouguet detonations can be reproduced by the model. The resulting blast profiles, pressure-time traces, and detonation velocity for multidimensional simulations are relatively independent on the input parameters, again, provided the inputs are physically reasonable. The simplified burn model shows great potential for simulating afterburning processes with detailed reaction models or explosive particle dispersal. The SBM is relatively straightforward to implement in compressible multiphase flow codes.

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Detonation diffraction in a circular arc geometry of the insensitive high explosive PBX 9502

Cited by 18 publications

References 18 publications

Detonation performance experiments and modeling for the DAAF-based high explosive PBX 9701

Detonation performance experiments and modeling for the DAAF-based high explosive PBX 9701

Multiscale Approach to Shock to Detonation Transition in Energetic Materials

A simplified burn model for simulating explosive effects and afterburning

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