CHINESE JOURNAL OF ENERGETIC MATERIALS
+Advanced Search

Characteristics of Spatial Distribution of Aluminum Powder and Afterburning Energy Release During the Explosion Process of Laminated Composite Charge
Author:
Affiliation:

1.Xi′an Modern Chemistry Research Institute, Xi′an 71065, China;2.Rocket Force University of Engineering, Xi′an 71025, China;3.School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China

Fund Project:

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
    Abstract:

    To investigate the influence of the structure of a laminated composite charge on its energy release during the afterburning process of aluminum powder, a composite charge with a multiple sandwich structure of uniform layer thickness was prepared by introducing two types of explosives namely high explosive and thermobaric explosive. The high explosive with a higher detonation velocity than that of the thermobaric explosive by 1.8 km·s-1. The evolutionary process of the fire ball and the mechanical energy in different ambient environment during various reaction stages were independently investigated in free-air and confined explosion experiments. Additionally, the distribution characteristics of aluminum powder throughout the explosion were assessed through integrated numerical simulation. The results showed that the thermobaric explosive layer was axially compressed by the high explosive layer, resulting in an increase in the radial diffusion rate of both detonation products and aluminum powder. Furthermore, the average concentration of the aluminum powder cloud was reduced to 60%-80% of that in a homogeneous thermobaric charge, and even to 50% in the tail region, finally resulting in a reduction of anaerobic combustion rate of aluminum powder, as well as the mechanical energy released by aluminum powder. In the laminated composite charge, the total mechanical energy released by thermobaric explosive in detonation and anaerobic combustion process was about 81% of that in a corresponding homogeneous thermobaric charge. However, the mechanical energy produced during the aerobic combustion stage increased significantly, leading to the total mechanical energy remained approximately stable. This study indicated that the laminated composite charge structure could efficiently regulate the afterburning reaction and energy release of thermobaric explosives in different reaction stages by adjusting the spatial distribution of aluminum powder without losing the total energy of the charge.

    Reference
    Related
    Cited by
Article Metrics
  • PDF:
  • HTML:
  • Abstract:
  • Cited by:
Get Citation

SHEN Fei, WANG Yuan-jing, Wang Yi-xin, et al. Characteristics of Spatial Distribution of Aluminum Powder and Afterburning Energy Release During the Explosion Process of Laminated Composite Charge[J]. Chinese Journal of Energetic Materials(Hanneng Cailiao),DOI:10.11943/CJEM2024221.

Cope
History
  • Received:August 25,2024
  • Revised:October 21,2024
  • Adopted:October 24,2024
  • Online: October 25,2024
  • Published: