Laser-induced ignition modeling of HMX

Meredith, Karl V.; Gross, Matthew L.; Beckstead, M. W.

doi:10.1016/j.combustflame.2014.08.004

Cited by 31 publications

(18 citation statements)

References 19 publications

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“…1. Figure 3 presents a one-dimensional representation for fast cook-off that varies slightly from that of the laser-induced ignition model described by Meredith et al [15]. The heat flux is imposed directly at the exterior of the steel wall, unlike laser-induced ignition where there is no wall and the irradiant flux is imposed directly on the surface of the HMX.…”

Section: Governing Equationsmentioning

confidence: 98%

“…The governing equations for the gas phase are identical to those used for laser-induced ignition [15]. Due to the thin dimension of the gas phase in fast cook-off scenarios, Cartesian coordinates are assumed to accurately represent the problem.…”

Section: Gas Phasementioning

confidence: 99%

“…The current study extends the laser-induced ignition model for HMX [15] to simulate the fast cook-off responses of HMX. These responses include the variation both spatially and temporally of temperature, pressure, species fractions, and velocity for the fast cook-off system.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive work has been performed on ignition of HMX [10][11][12][13][14][15], but reported that semi-global kinetics could be used to reasonably predict time-to-ignition [16]. Time-to-ignition in fast cook-off is comparable to laser-induced ignition of bare samples by properly accounting for the heat flux entering the energetic material's surface [17].…”

Section: Introductionmentioning

confidence: 99%

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Fast cook-off modeling of HMX

Gross

Meredith

Beckstead

2015

Combustion and Flame

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Section: Governing Equationsmentioning

confidence: 98%

Section: Gas Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fast cook-off modeling of HMX

Gross

Meredith

Beckstead

2015

Combustion and Flame

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“…The Liau model divided the entire process into six stages: inert heating, thermal decomposition, occurrence of primary flame, preparation and formation of secondary flame, and finally, establishment of steady-state combustion. Liau et al [9] and Meredith et al [10] extended the Liau model to describe the ignition process of HMX.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Laser‐Induced Ignition of RDX Using Detailed Chemical Kinetics

Tian

Zhang

et al. 2014

Propellants Explo Pyrotec

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A laser‐induced ignition model of RDX is developed, in which a detailed chemical kinetics scheme, containing 45 species and 231 reactions, is employed to describe the reaction in the gas phase. The model is spatially one‐dimensional and includes the transient development of two regions: the condensed phase and the gas phase. The condensed phase is composed of solid RDX, liquid RDX, and some decomposition products. The main physicochemical processes include melting, decomposation, vaporization, and radiation absorption. The gas phase is composed of RDX vapor and reaction products and the main processes include convection, diffusion, heat conduction, chemical reaction, and radiation absorption. With interfacial boundary conditions, the governing parameters for the condensed phase are conservation equations of energy and species concentration, whereas those for the gas phase are the conservation equations of mass, momentum, energy, and species concentration. A finite difference program using FORTRAN is compiled and numerical simulation is carried out. The ignition process of RDX is discussed from the distribution and evolution of temperature and species concentration. The model can provide a reasonable prediction of the phenomenon that the flame moves towards the surface immediately after ignition, and then departed from the surface.

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Considerations for Fast Cook‐Off Simulations

Gross

Hedman

Meredith

2016

Propellants Explo Pyrotec

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Various aspects of fast cook‐off simulations are explored with a spatially one‐dimensional, fully transient numerical model. The model is applied to HMX and consists of equations for the solid (condensed) phase, the gas phase, and the surrounding steel container. The condensed phase HMX decomposition reactions are described by distributed kinetics. The gas phase description includes a detailed chemistry model for the combustion of HMX. Results are presented that outline considerations for simulating fast cook‐off ignition. It is found that small changes in the heat path, such as air gaps, significantly change the predicted ignition time for fast cook‐off, but have minimal effect on slow cook‐off predictions. Simulations indicate that an average heat flux can be used in place of the temporally varying heat flux created by a pool fire. A method is outlined to predict time‐to‐ignition using lab‐scale empirical data instead of directly implementing decomposition kinetics of an energetic material into a simulation.

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Laser-induced ignition modeling of HMX

Cited by 31 publications

References 19 publications

Fast cook-off modeling of HMX

Fast cook-off modeling of HMX

Modeling and Simulation of Laser‐Induced Ignition of RDX Using Detailed Chemical Kinetics

Considerations for Fast Cook‐Off Simulations

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