Effect of the temperature dependence of the absorption coefficient on the critical energy of ignition of condensed substances by a laser pulse

Propellants Explo Pyrotec

Mitrofanov

Зверев

2019

This work presents experimental results of the PETN ignition in a three-layer system: glass -copper oxide ( CuO) -explosive materials (EM) and results of numerical simulations of the ignition of PETN, RDX, HMX, and TATB with a CuO film heated by a YLS-150 fiber laser with a pulse duration of 20 ms. In the numerical simulations, the endothermic reaction of decomposition of the CuO film and decomposition reaction of EM were taken into account. It has been established that the endothermic effect of the CuO decomposition reaction increases the dynamic ignition delay time of EM. The expression for an estimation of width of a reaction layer in EM at heating by a constant heat stream is obtained. Calculations have shown that the dynamic threshold of ignition of organic explosives by laser pulse in a three-layer system (glass -CuO -EM) has a minimum for the thickness of the copper oxide film of 5 mm. The density of the critical ignition energy of an explosive laser pulse increases in the sequence of PETN, RDX, HMX, and TATB. The calculated dependence of the PETN dynamic ignition delay time on the thickness of the CuO film is consistent with the experimental data.

Section: Symbols and Abbreviationsmentioning

confidence: 99%

Section: Symbols and Abbreviationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Decomposition of CuO Film on Ignition of Organic Explosives by a Laser Pulse

Propellants Explo Pyrotec

Mitrofanov

Зверев

2019

“…Recently there has been a considerable increase in the number of papers on both experimental studies and numerical simulation of the conditions of explosive initiation by laser pulse [1][2][3][4][5][6][7]. It is caused by both the development of the new explosive initiation methods and scientific interest in defining the initiation mechanism in order to regulate the threshold energy of initiation purposefully.…”

Section: Introductionmentioning

confidence: 99%

Ignition of organic explosives by a laser pulse

Dolgachev

2015

EPJ Web of Conferences

Abstract. The modeling of initiation of PETN, RDX, HMX and TATB by a short laser pulse is done in this work. The heat-conduction equation was solved in a cylindrical coordinate system taking into account multiple reflection of the light beam, zero-order exothermic reaction, and melting. The calculation results for PETN are in satisfactory agreement with experiment. Calculations have shown that with an identical coefficient of absorption the most sensitive is PETN, and the most heat-resistant is TATB.

“…In recent years significantly increased the number of works on the experimental study and numerical simulation of ignition of condensed explosives by a laser radiation, as well as by heat sources with a limited power capacity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. This is caused by the prospects of practical use of laser initiation of energetic materials, and clarification of the mechanism of ignition of explosives.…”

Section: Introductionmentioning

confidence: 99%

Influence of the thickness absorbing film on the PETN ignition threshold by a laser pulse

Dolgachev

MATEC Web of Conferences

2015

Abstract. Numerical simulation of the PETN ignition by a film, which is heated by a laser pulse was conducted. There are shown that dependence of threshold energy of ignition of PETN by a laser pulse has a linear dependence from the thicknesses of the absorbing film. Calculations shown that critical the temperature on the boundary of two materials by the end of a laser pulse with threshold density doesn't depend from the thickness of the absorbing film. The ignition delay time of PETN by the thick film less than the ignition delay time of PETN by the thin film. The reason is that the thicker contain more heat then in the thinner one.