The propulsive capability of explosives heavily loaded with inert materials

Loiseau, Jason; Georges, William; Frost, David L.; Higgins, Andrew

doi:10.1007/s00193-017-0781-1

Cited by 10 publications

(2 citation statements)

References 65 publications

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“…This selected value of cavity diameter is very close to the range of mean diameter of GMBs used to sensitize gelled NM as reported in a number of experimental studies. [52][53][54][55][56][57][58] The detailed comparison between these selected parameter values to realistic conditions of experimental studies on SDT in GMB-sensitized NM will be discussed in Sect. V E. Sample results showing the evolution of wave structure for the scenarios with neat NM, regularly spaced cavities, and randomly distributed cavities are shown in Sect.…”

Section: Results and Analysismentioning

confidence: 99%

Meso-resolved simulations of shock-to-detonation transition in nitromethane with air-filled cavities

Michael

Ioannou

et al. 2019

Journal of Applied Physics

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Two-dimensional, meso-resolved numerical simulations are performed to investigate the complete shock-to-detonation transition (SDT) process in a mixture of liquid nitromethane (NM) and air-filled, circular cavities. The shock-induced initiation behaviors resulting from the cases with neat NM, NM with an array of regularly spaced cavities, and NM with randomly distributed cavities are examined. For the case with randomly distributed cavities, hundreds of cavities are explicitly resolved in the simulations using a diffuse-interface approach to treat two immiscible fluids and GPUenabled parallel computing. Without invoking any empirically calibrated, phenomenological models, the reaction rate in the simulations is governed by Arrhenius kinetics. For the cases with neat NM, the resulting SDT process features a superdetonation that evolves from a thermal explosion after a delay following the passage of the incident shock wave and eventually catches up with the leading shock front. For the cases wherein mesoscale heterogeneities are explicitly considered, a gradual SDT process is captured. These two distinct initiation behaviors for neat NM and heterogeneous NM mixtures agree with experimental findings. Via examining the global reaction rate of the mixture, a unique time scale characterizing the SDT process, i.e., the overtake time, is measured for each simulation. For an input shock pressure less than approximately 9.4 GPa, the overtake time resulting from a heterogeneous mixture is shorter than that for neat NM. This sensitizing effect is more pronounced for lower input shock pressures. A random distribution of cavities is found to be more effective in enhancing the SDT process than a regular array of cavities. Statistical analysis on the meso-resolved simulation data provides more insights into the mechanism of energy release underlying the SDT process. Possible directions towards a quantitatively better agreement between the experimental and meso-resolved simulation results are discussed. arXiv:1905.05727v2 [physics.comp-ph]

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Section: Results and Analysismentioning

confidence: 99%

Meso-resolved simulations of shock-to-detonation transition in nitromethane with air-filled cavities

Michael

Ioannou

et al. 2019

Journal of Applied Physics

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“…[9] In order to further investigate these results of anomalous scaling, the present study examines two explosives: (1) gelled NM with GMBs (similar to the prior study of [10]) and (2) gelled NM with GMBs and also large-scale inert inclusions that are of a dimension comparable to the critical thickness of the charge. The propulsive ability of this class of explosives is further studied in [11].…”

Section: Introductionmentioning

confidence: 99%