Energy Output Effects of the Aluminium Powder Distribution on DNTF-based Composite Thermobaric Charges
F. Shen1, J.-T. Wang1, L.-F. Li2, W.-L. Yu1, X.-J. Wang1
1Rocket Force University of Engineering, Xi'an, China
2Xi'an Modern Chemistry Research Institute, Xi'an, China
Keywords: composite explosive charge, aluminum powder, 3,4-dinitrofuroxan furoxan (DNFT), internal explosion, energy yield
Abstract
The effect of aluminum powder distribution on the explosion energy of layered composite charges of thermobaric explosives based on a melt of high-energy 3,4-dinitrofurosan furoxan (DNFT) was investigated. The composites consisted of inner and outer cylindrical layers with controlled spatial distribution of aluminum powder. Blast tests were carried out in a closed explosion chamber filled separately with either nitrogen or air. Data were obtained on the quasi-static pressure, excess pressure in the shock wave, and the evolution of the fireball. Using numerical modeling, the diffusion of aluminum powder during the explosion was studied using a combined discrete element and finite element method. The results show that concentrating aluminum powder in the outer layer of the composite increases the concentration of aluminum powder in the cloud, which leads to an increase in the burning rate and energy yield in the early stages of the explosion. Conversely, aluminum powder concentrated in the inner layer is compressed toward the center and then bounces back, slowing down diffusion and affecting anaerobic combustion processes.
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