Abstract
Aiming at the lack research of high-speed water-entry for large projectile, this paper studied the high-speed water-entry for hemispherical-nosed projectile in the method of fluid-solid coupling. Good agreements were obtained compared with the theoretical results. The modalities of water were calculated such as cavity, uplift and pressure. The velocity and deceleration curves of water-entry were gained. Numerical research shows that there is heavy shock pressure on the projectile and pressure waves in water by a projectile impacting into water at high speed, the pressure at the apex and the vicinity is much higher than the rest of area. The projectile’s peak acceleration is in linear correlation with the square of impact velocity. The simulation affords bases for impact-resistant design of the airdropped projectile, and of certain value to investigation of other correlative bodies’ high-speed water-entry.
Highlights
There will be a lot of phenomenon during high-speed water entry by a projectile, such as cavity, pressure wave and so on
The simulation results show that the water entry impact force is huge, the maximum impact force is directly proportional to the square of water entry velocity [2]
The method of Fluid solid coupling is used in this paper to investigate the high-speed water-entry of the hemispherical-nosed projectile, and the compressibility of the water was taken into consideration
Summary
There will be a lot of phenomenon during high-speed water entry by a projectile, such as cavity, pressure wave and so on. This paper is aimed to study the high-speed water-entry phenomena of hemispherical-nosed projectile. Wang Jian investigated the phenomenon of the rocket sled water-brake high speed entering into water by using the method of fluid-solid coupling. High-speed water-entry should consider the water’s compressibility, which can be ignored at low-speed. Investigations on the low-speed water-entry of large projectiles are relatively mature. Due to the limitation of experimental conditions, the high-speed water-entry hasn’t been investigated very well [3,4,5]. The method of Fluid solid coupling is used in this paper to investigate the high-speed water-entry of the hemispherical-nosed projectile, and the compressibility of the water was taken into consideration
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