Related references
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Article
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Summary: This study experimentally investigates the oblique water entry of hollow cylinders with different inner diameters. The multiphase flow characteristics of the cavity, through-hole jet, and multiscale bubbles are revealed and discussed. High-speed photography technique is used to capture the water entry process. The results show that the fluid forms through-hole jet and cavity along the flow separation position, and undergoes various evolutions.
Article
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Article
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Summary: This study reports on an experimental investigation of the trajectories of truncated cone projectiles during water entry. The stability of the water entry trajectory is crucial for projectile motion control. It is found that the wetted surface of the projectile's nose plays a significant role in trajectory stability. The study systematically quantifies the relationship between trajectory stability and nose parameters, providing important insights for future design considerations.
Article
Engineering, Marine
Yu Hou et al.
Summary: The oblique water entry of hollow cylinders with different apertures was experimentally investigated, revealing and discussing the evolution characteristics of cavities, jets and splashes under different initial conditions and apertures. The study found that the change in cavity closure patterns is delayed as the water-entry velocities increase, and a unique curved through-hole jet was discovered.
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Summary: This study numerically investigates the high-speed water-entry phenomenon of vehicles with a free and constant speed, comparing the behavior of cavities generated by projectiles with different nose shapes, tail shapes, and impact speeds. It also compares the drag characteristics of projectiles with different impact speeds, and analyzes the flow characteristics of the flow field.
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Summary: The study found that in the presence of brash ice, the collapse of bubbles during the vehicle's water-exit process created an eruption state, with underwater cavities shrinking and shedding, resulting in diverse effects on the vehicle's force and moment. The overall deflection angle was greater than that under ice-free conditions. As the water-exit speed increased, the splash time became earlier, the splash range became more dispersed, and pressure fluctuations became more severe during the entire water-exit process.
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Summary: The experimental study on the multiphase flow characteristics of oblique water entry of semi-closed cylinders reveals three different cavity modes, with the rippling becoming more fragmentary and blurry as the inclined angle of the cylinder increases.
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Summary: This paper investigates the cavity geometry and drag force characteristics of supersonic projectiles entering the water surface in series and parallel through numerical simulations. Results show that the impact drag force coefficient of the second projectile in series entry is significantly smaller than that of a single projectile, while the cavitation drag force coefficient fluctuates. In parallel entry, the impact drag force coefficient is slightly smaller than single projectile entry, and the inside boundary shape of the cavity is influenced by a blockage effect.
Article
Engineering, Marine
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Summary: This study investigates the water-entry characteristics of high-speed parallel projectiles numerically. The interference between parallel projectiles leads to non-uniform cavity distribution, reduced trajectory stability, increased drag, and accelerated velocity attenuation under parallel water-entry conditions.
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