Shock wave evolution of cylindrical charge with different slender ratios

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 149-157.

MA Teng,WANG Jinxiang,LIU Liangtao,HUANG Ruiyuan,TANG Kui,LIN Shangjian,GU Yangchen

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Abstract

In order to analyze the influence of charge shape on the evolution of underwater explosion shock wave, the calculation method of initial shock wave pressure and its propagation direction on the interface between explosive and water was established in theory for the problem of center initiation of two-dimensional cylindrical charge. With the aid of AUTODYN finite element program, the tests are conducted with constant-mass cylindrical explosives with slender ratio ranging from 1:2 to 10:1. Experiments on underwater explosion of cylindrical TNT with slender ratio of 1:1 and 2.6:1 are carried out. By comparing with the result of the theoretical, simulation and experimental, the effects of the slender ratio on the propagation of the shock wave，the initial shock wave pressure and the pressure distribution in the infinite water were analyzed. The results show that the shock wave front gradually changes from cylindrical shape to ellipsoid shape and then to spherical shape for cylindrical charge exploding underwater. When the shock wave propagates to 10 times of dimensionless detonation distance, the transfer of high-pressure zone ends. When the slender ratio is greater than 1:1, the decay rate of the shock wave approach the axial (End surface) is greater than that of the radial (Cylindrical surface), and the peak pressure of shock wave changes with the direction angle. In the range of 1:1-5:1 slender ratio and 20 times dimensionless detonation distance, the radial shock wave pressure of explosive can be enhanced directionally by increasing the slender ratio of explosive, and the influence of the shape charge on shock wave pressure distribution decreases with the increase of detonation distance.

Key words

Underwater Explosion / Cylindrical Charge / Slender Ratio；Shape of shock wave front / Peek pressure / Pressure distribution of shock wave

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MA Teng,WANG Jinxiang,LIU Liangtao,HUANG Ruiyuan,TANG Kui,LIN Shangjian,GU Yangchen. Shock wave evolution of cylindrical charge with different slender ratios[J]. Journal of Vibration and Shock, 2022, 41(8): 149-157

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