Enhancement mechanism study of detonation at both ends in near ground field of shock wave based on different length to diameter ratios

DOI:	10.11809/bqzbgcxb2024.10.022
Keywords:	near ground explosion; overpressure; dual end initiation; denotation wave collision; length diameter ratio
Abstract:	Dual end initiation can alter the explosive energy output structure of explosives, enhancing the near ground shockwave overpressure. Figuring out the enhancement mechanism of dual end initiation on the near ground overpressure is instructive for improving the efficiency of charge energy utilization. A large scale shockwave power simulation model is established to analyze the different period of the explosion in the research. The pressure changes before and after detonation wave collision is calculated and analyzed, and the characteristics of shockwave power field are examined. Under the conditions of various length to diameter ratios, the evolution of shockwave power field characteristics is observed, and the enhancement mechanism of dual end initiation on the near ground overpressure power field is analyzed. Static explosion tests are conducted with 20 kg charges of different length to diameter ratios to verify the enhancement mechanism of dual end initiation on near ground overpressure. The research reveals that in the explosives with dual end initiation, two detonation waves collide, forming two axial reflected waves and one radial strong shockwave. The combination formed a double layer reflected wave system structure within the shockwave power field. Compared to single end initiation, the double layer reflected wave system significantly increased the overpressure of the near ground shockwave. Simulation and experiment results indicated that dual end initiation achieved optimal enhancement on near ground shockwave overpressure at the length to diameter ratio of 3.5.
Issue:	Vol. 45 No. 10 (2024)
Published:	2024-10-31
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