Simulation of the ignition of organic explosives by a laser pulse in the weak absorption region

• Published in: Combustion, explosion, and shock waves Vol. 53; no. 2; pp. 211 - 218
• Main Authors: Dolgachev, V. A., Duginov, E. V., Khaneft, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.03.2017; Springer Nature B.V
• Subjects: Absorptivity; Classical and Continuum Physics; Classical Mechanics; Computer simulation; Conduction heating; Control; Cylindrical coordinates; Dynamical Systems; Energetic materials; Engineering; Exothermic reactions; Flux density; HMX; Ignition; Lasers; Light reflection; PETN; Physical Chemistry; Physics; Physics and Astronomy; Radiation absorption; RDX; TATB; Temperature gradients; Vibration; laser pulse; HMX; simulation; RDX; melting; PETN; ignition criterion; TATB; thermal initiation
• DOI: 10.1134/S0010508217020125
• ISSN: 0010-5082

Numerical simulation of the ignition of RDX, HMX, and TATB by a nanosecond laser pulse was performed. The heat-conduction equation was solved in cylindrical coordinates with allowance for the multiple reflection of the light beam, a zero-order exothermic reaction, and melting. Despite the small temperature gradient due to the smallness of the radiation absorption coefficient, violation of thermal equilibrium due to Arrhenius nonlinearity leads to ignition of energetic materials from the surface. The critical energy density for ignition of PETN, RDX, HMX, and TATB by a nanosecond laser pulse was determined. Calculations have shown that with identical absorption and reflection coefficients, PETN is the most sensitive and TATB is the most heat-resistant.