Propagation of predetonation regimes in porous explosives

Obmenin, A. V.; Korotkov, A. I.; Сулимов, А. А.; Dubovitskii, V. F.

doi:10.1007/bf00742066

Cited by 15 publications

(3 citation statements)

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“…Thereby, the run distance to detonation decreased. The fitting curve of l vs. φ s is a semi-U type, which is reasonably consistent with that observed in experimental results [25,26]. The results indicate that with an increase in the solid volume fraction, in the range 0.65 <φ s < 0.75, the tendency for DDT increased, and the safe performance of a high-energy solid propellant decreased.…”

Section: Effect Of Solid Volume Fraction On Ddtsupporting

confidence: 89%

“…The initial condition for the two regions at t = 0 is expressed by Equation 23 and the state equations of the gas and solid phases are expressed by Equations 24 and 25, respectively. 10,0,10 0 5 , , 1,0,1 5 10 (24) e i = c vi T i (25) where subscript i denotes the gas or solid phase. In these calculations, 1000 cells with reflection boundary conditions were considered.…”

Section: Validation Of One-dimensional Codementioning

confidence: 99%

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Numerical Simulation of the Deflagration to Detonation Transition in Granular High-Energy Solid Propellants

Zhen

Wang

2019

Cent. Eur. J. Energ. Mater.

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This paper describes a one-dimensional code developed for analyzing the two-phase deflagration to detonation transition (DDT) phenomenon in granular high-energy solid propellants. The deflagration to detonation transition model was established based on a one-dimensional two-phase reactive flow model involving basic flow conservation equations and constitutive relations. The whole system was solved using a high resolution 5th-order WENO (Weighted Essentially Non-Oscillatory) scheme for spatial discretization, coupled with a 3rd-order TVD Runge-Kutta method for time discretization, to improve the accuracy and prevent excessive dispersion. An inert two-phase shock tube problem was carried out to access the developed code. The DDT process of high-energy solid propellants was simulated and the parameters of detonation pressure, run distance to detonation and time to detonation were calculated. The results show that for a solid propellant bed with solid volume fraction 0.65, the run distance to detonation was about 120 mm, the detonation induced time was 28 μs, and the detonation pressure was 18 GPa. In addition, the effects of solid volume fraction (φs) and pressure exponent (n) on the deflagration to detonation transition were also investigated. The numerical results for the DDT phenomenon are in good agreement with experimental results available in the literature. IntroductionStudy on the deflagration to detonation transition (DDT), which is one of the important characteristics of energetic materials, has been conducted for many decades, in both industrial and military studies. This phenomenon is a complex solid combustion problem and is influenced by a variety of factors. DDT has been physically investigated by typical Macek's tube experiments [1,2] and piston-ignited DDT experiments [3][4][5] in order to obtain a mechanistic description of the phenomenon. Bernecker [6] reviewed the DDT process and the variables that influence it in porous high-energy propellants. Recently, McAfee [7] summarized many of the physical observations of the DDT process and systematically elucidated the DDT mechanism for energetic materials with different densities, defining the major types of DDT. However, it is difficult to describe the transition to detonation accurately and quantitatively because of the complex nature of the DDT process. Therefore, the present paper attempts to study the DDT process of a high-energy solid propellant by numerical simulation, in order to provide the basis for the safe production, storage and use of propellants.At present, three main reactive flow models, varying from single phase to three phases, have been developed to simulate the deflagration to detonation transition in granular energetic materials [8][9][10][11]. Two-phase flow models, including the Baer-Nunziato (BN) model proposed by Baer, Nunziato et al. [12,13] and the Powers-Stewart-Krier (PSK) model proposed by Powers et al. [14], are widely used to numerically simulate the DDT process of an energetic material. The two-phase flow models are ba...

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Section: Effect Of Solid Volume Fraction On Ddtsupporting

confidence: 89%

Section: Validation Of One-dimensional Codementioning

confidence: 99%

Numerical Simulation of the Deflagration to Detonation Transition in Granular High-Energy Solid Propellants

Zhen

Wang

2019

Cent. Eur. J. Energ. Mater.

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“…The Deflagration-to-Detonation Transition (DDT) in one-dimensional porous explosive, where combustion in an explosive transitions to detonation, can be described by the following model [4] [5]. This simplified model proceeds in five steps, as follows: 1) Ignition of the explosive, surface burning.…”

Section: Introductionmentioning

confidence: 99%

The Deflagration-to-Detonation Transition in Two Dimensions

Heatwole

Feagin

Parker

2020

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Propriétés mécaniques des poudres et explosifs pulvérulents et mode de transition déflagration/détonation

Samirant

Lichtenberger

1986

Propellants Explo Pyrotec

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Deux modes de transition combustion/déflagration/détonation ont été mis en évidence dans les milieux réactifs poreux fortement confinés dans des tubes d'acier. L'un fait intervenir une transition choc/détonation, par exemple dans une hexocire, l'autre montre une accélération progressive et continue de l'onde de combustion jusqu' à la détonation dans une poudre sphérique double base. Au moyen de jauges à couche de Manganin et de jauges d'extensométrie nous avons suivi la propagation des ondes de compression en avant du front de combustion et nous avons montré que le lit d'explosif est quasi élastique alors que le lit de poudre subit un intense travail mécanique. La différence dans la dissipation d'knergie qui en résulte en avant du front de combustion pourrait être responsable de la différence de comportement entre ces deux milieux réactifs. En modifiant par broyage préalable les propriétés de la poudre sphérique on montre qu'elle peut aussi subir une transition choc/détonation.

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Propagation of predetonation regimes in porous explosives

Cited by 15 publications

References 1 publication

Numerical Simulation of the Deflagration to Detonation Transition in Granular High-Energy Solid Propellants

Numerical Simulation of the Deflagration to Detonation Transition in Granular High-Energy Solid Propellants

The Deflagration-to-Detonation Transition in Two Dimensions

Propriétés mécaniques des poudres et explosifs pulvérulents et mode de transition déflagration/détonation

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