弹体水平入水的空泡扩展相关特性研究

In this paper, the horizontal water-entry experiments of flat, hemispherical, truncated-ogival and spherical projectiles at the velocity range of 100-300 m/s have been conducted with a light-gas gun. The whole water entry and cavitation expansion processes were recorded by a high-speed camera. Variation laws of the pressure difference Δp along the penetration distance were indirectly investigated by the principle of energy conservation. Moreover, the average cavity wall velocity at different cavity sections which are along the penetration distance was also studied. Two variation laws were found for the pressure difference Δp, and results show that the average cavity wall velocity remains consistent basically for different cavity sections along the ballistic trajectory which is in the same water-entry condition. Good agreements were observed between experimental and analytical results.