Analysis of the efficiency enhancement in the explosion area of the tandem charge

DOI:	10.11809/bqzbgcxb2024.01.004
Keywords:	tandem charge; regional efficiency; shock wave superposition; area of the damaged region
Abstract:	Targeting at regional increase in efficiency at the explosion area of the tandem charge, the calculation model of the two point charge explosion is established with LS DYNA. The propagation process and interaction of the shock wave during the two point charge explosion are simulated and researched in the case of different charge spacing and different charge quality conditions. In addition, the overpressure and impulse attenuation laws unfolded in the numerical simulation are verified by experiments. The relative magnitude of overpressure of the incident shock wave and the reflected shock wave for the two point charge is analyzed, and the effect enhancement area within the impactive zone of the shock wave is divided into the remarkable enhancement region, the transition region, and the enhancement failure region. The influence of charge quality and charge spacing on the area of the impactive zone of shock wave is analyzed in the consideration of different damage threshold. In this way, the optimal charge spacing under different damage thresholds is determined, as well as the relationship between charge quality, optimal charge spacing, and damage threshold is obtained. To conclude, in the case of the two point charge, the incident waves interact and form a strong reflected wave in the remarkable enhancement region, and the superposition of the strong reflected wave and the subsequent incident wave lead to the significant increase of overpressure. Consequently, the overpressure peak of the two point charge reflected wave is wholly higher than the overpressure peak of the incident wave of the single point charge. Under different damage threshold conditions, the effective impact area will show a trend of first increasing and then decreasing with the increase of charge spacing. Furthermore, under the condition of a certain charge quality and damage threshold, the optimal charge spacing always exists, corresponding to the maximum effective damage area. The destruction threshold and optimal charge spacing render polynomial function relationships with the cubic root of charge mass.
Issue:	Vol. 45 No. 1 (2024)
Published:	2024-01-28
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