Abstract
When a high-velocity penetrator impacts a liquid-filled container, such as a fuel tank, the phenomenon of hydrodynamic ram occurs. The cavity formed in the liquid and the resultant complex pressure field may cause the liquid to spurt from the penetration orifices. In this study, an experiment in which a high-velocity fragment impacts a liquid-filled container is conducted to examine the resulting liquid spurt. The characteristics of the liquid spurt are investigated. It is revealed that both the impact velocity of the fragment and the shape of the penetration orifice affect the characteristics of the liquid spurt. The expansion and contraction of the cavity are direct causes of the liquid spurt. Moreover, the relationship between the liquid spurt velocity and the pressure in the liquid is analyzed, and the theory of the pressure distribution that exists during the cavity oscillation is preliminarily proposed. The change in the cavity volume during the oscillation and the initial internal gas pressure in the cavity contribute significantly to the pressure field in the liquid.
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