The distribution of shock wave load from a shallow underwater explosion with inline charge

DOI:	10.11809/bqzbgcxb2024.12.019
Keywords:	linear charge, underwater explosion; free surface effects; straight zone pressure; radial axial pressure
Abstract:	Aiming at the problem of using in line charge to salvage sunken ships and containers in shallow water ports, this paper uses LS DYNA software to establish an explosion model under in line charge, carries out a study on the distribution characteristics of explosion pressure field under in line charge, and obtains the influence law of sedimentation depth and charge diameter on pressure field, as well as the difference between in line charge and group charge radial pressure field.The results show that: the pressure field of straight line charge is different from that of cylindrical charge, the radial pressure is the highest, the end of charge is the second, and the initiation end is the lowest; The shock wave changes from droplet shape to ellipsoid shape while the radial high pressure region moves towards the end of charge; The 3 kg charge can be considered as deep water explosion in the sinking depth range of 0.425 m to 4.525 m. When the distance between the charge and the bottom or water surface is less than 42.5 cm, the shock wave will be clipped when the radial pressure of the charge is beyond 30 times the charge radius, and the clipping range will expand with the increase of the distance.When the charge length diameter ratio is higher than 30, the radial pressure appears a “linear zone”, and increasing the charge diameter will linearly reduce the length of the “linear zone”.The in line charge pressure at the same distance of 3 kg charge is 17% higher than that of the group charge, and the difference of pressure is related to the amount and distance of the charge.
Issue:	Vol. 45 No. 12 (2024)
Published:	2024-12-30
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