DSD/WBL-consistent JWL equations of state for EDC35

Hodgson, Alexander; Handley, Caroline

doi:10.1063/1.3686265

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…Product EOSs such as the JWL or Davis EOS are commonly used [34,32,13]. Model enhancements also exist to make these approaches more realistic including a velocity-adjusted JWL method [22,24] that modulates the product state to the local surface normal speed and a Pseudo-Reaction Zone approach that mimics the main features of a RB model, with the release energy due to reaction occurring over a finite length zone [12].…”

Section: Modeling Approachesmentioning

confidence: 99%

“…This was done to facilitate the subsequent modeling of the CYLEX test. This calculation provides two key quantities needed in the hydrodynamic phase of the calculation, the time-of-arrival field of the detonation front at every point x in the HE geometry t b (x) and the local detonation front normal velocity D n (x) which gauges the wave curvature effect imposed by the geometry and confiner on the detonation flow.3.1.2 VAJWL Product EOS CalibrationThe DSD timing model is often paired with a perturbation of the popular Jones-Wilkins-Lee (JWL) product equation of state to compose a PB method that is sensitive to changes in shock strength[22,24]. The Velocity-Adjusted Jones-Wilkins-Lee (VAJWL) methodology is able to modulate the product state (and thus the implied energy release) to be consistent with changes in detonation shock strength.…”

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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: Modeling Approachesmentioning

confidence: 99%

mentioning

confidence: 99%

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

Chiquete

Jackson

Short

2021

Combustion and Flame

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“…2, together with the deviation of each from the expected detonation shock dynamics (DSD) energyrelease [6] model isentrope. An example of an isentrope calculated using a standard DSD model [1] is also included for reference. In each case arbitrary starting JWL parameters were selected, with the iteration beginning at a pressure of 30 GPa.…”

Section: Comparison With Hydro-code Datamentioning

confidence: 99%

“…The HE is initiated from one end and as the detonation wave propagates along the cylinder the copper wall begins to expand. Analysis of the copper wall expansion can be used to determine parameters for the Jones-Wilkins-Lee (JWL) Equation of State (EOS) for the detonation products via hydro-code modelling [1]. This involves adjustment of the JWL parameters until the model agrees with experiment.…”

Section: Introductionmentioning

confidence: 99%

An analytical approach to obtaining JWL parameters from cylinder tests

Sutton

Ferguson

Hodgson

2017

AIP Conference Proceedings

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Abstract. An analytical method for determining parameters for the JWL Equation of State from cylinder test data is described. This method is applied to four datasets obtained from two 20.3 mm diameter EDC37 cylinder tests. The calculated pressurerelative volume (p-V r ) curves agree with those produced by hydro-code modelling. The average calculated Chapman-Jouguet (CJ) pressure is 38.6 GPa, compared to the model value of 38.3 GPa; the CJ relative volume is 0.729 for both. The analytical pressure-relative volume curves produced agree with the one used in the model out to the commonly reported expansion of 7 relative volumes, as do the predicted energies generated by integrating under the p-V r curve. The calculated energy is within 1.6% of that predicted by the model.

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Scaling of the detonation product state with reactant kinetic energy

Jackson

2018

Combustion and Flame

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DSD/WBL-consistent JWL equations of state for EDC35

Cited by 6 publications

References 1 publication

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

An analytical approach to obtaining JWL parameters from cylinder tests

Scaling of the detonation product state with reactant kinetic energy

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