A study on the cavitation expansion related characteristics induced by horizontal water entry of projectiles

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 90-94.

GUO Zitao1，CHEN Tuo2，GUO Zhao1，ZHANG Wei2

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Abstract

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 Δp 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 Δp,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.

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horizontal water entry / pressure difference / average cavity expansion velocity / theoretical model

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GUO Zitao1，CHEN Tuo2，GUO Zhao1，ZHANG Wei2. A study on the cavitation expansion related characteristics induced by horizontal water entry of projectiles[J]. Journal of Vibration and Shock, 2019, 38(4): 90-94

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