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Abstract <p>To investigate the influence of aluminum powder distributions on the explosion energy of layered composite thermobaric charges, various composites with coaxial inner and outer layers were prepared by adjusting the spatial distribution of aluminum powder using high-energy 3,4-dinitrofurazanfuroxan (DNTF) as the melt-casting carrier. The explosion tests were subsequently carried out in a closed tank separately filled with nitrogen and air, and the quasi-static pressure, shock wave overpressure, and fireball evolution processes were obtained. Simultaneously, a numerical simulation approach combining the discrete element method with the finite element method was employed to investigate the diffusion process of aluminum powder during an explosion. The results show that concentrating aluminum powder in the outer layer enhances the formation of higher-concentration aluminum powder clouds, leading to an increased combustion rate and energy output in the early explosive stage. Conversely, when aluminum powder is concentrated in the inner layer, it compresses toward the center and then rebounds, delaying diffusion and significantly impacting the anaerobic combustion process.</p>

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Energy Output Effects of the Aluminum Powder Distribution on DNTF-Based Composite Thermobaric Charges

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • F. Shen,
  • J.-T. Wang,
  • L.-F. Li,
  • W.-L. Yu,
  • X.-J. Wang

摘要

Abstract

To investigate the influence of aluminum powder distributions on the explosion energy of layered composite thermobaric charges, various composites with coaxial inner and outer layers were prepared by adjusting the spatial distribution of aluminum powder using high-energy 3,4-dinitrofurazanfuroxan (DNTF) as the melt-casting carrier. The explosion tests were subsequently carried out in a closed tank separately filled with nitrogen and air, and the quasi-static pressure, shock wave overpressure, and fireball evolution processes were obtained. Simultaneously, a numerical simulation approach combining the discrete element method with the finite element method was employed to investigate the diffusion process of aluminum powder during an explosion. The results show that concentrating aluminum powder in the outer layer enhances the formation of higher-concentration aluminum powder clouds, leading to an increased combustion rate and energy output in the early explosive stage. Conversely, when aluminum powder is concentrated in the inner layer, it compresses toward the center and then rebounds, delaying diffusion and significantly impacting the anaerobic combustion process.