engleski

Prediction of performance of explosives by EXPLO5 computer code

Thermochemical equilibrium calculation solves thermodynamic equations between products species to find chemical equilibrium at a specified pressure and temperature, and combining with the Chapman-Jouguet detonation theory to calculate detonation properties of an energetic material. The performance of an explosive may be predicted knowing only its chemical composition, enthalpy of formation and density. This lecture will provide details of computer code EXPLO5 and its application for high explosives, propellants, and pyrotechnics. The code is based on the chemical equilibrium, steady-state model of detonation. The calculation of equilibrium composition of detonation products is done in the program by applying modified White, Johnson, and Dantzig’ s free energy minimisation technique. The equation system describing mathematically state of equilibrium is solved by applying modified Newton-Raphson method. The program uses Becker-Kistiakowsky-Wilson (BKW) equation of state for gaseous detonation products and Murnaghan equation of state for condensed products. The pressure and thermodynamic parameters of combustion products are calculated by applying the ideal gas, or virial equation of state. Examples of calculations of various performance indicators of explosives (VOD, p, Isp, F, T, Qv, etc.) will be illustrated and discussed, as well as accuracy of calculations.

thermochemical calculation; detonation; combustion; performance of explosives; BKW EOS; EXPLO5 code;

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