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Hydrodynamic behavior of an underwater moving body after water entry

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Abstract

An experimental study was conducted to investigate the water entry phenomenon. A facility was designed to carry out the tests with the entry velocities of around 352 m/s. Visualization, pressure measurement, velocity measurement and underwater impact test were performed to investigate the hydroballistic behavior of the underwater moving body, the underwater flow field, the supercavitation, etc.. This study shows that the motion of a high-speed underwater body is strongly three-dimensional and chaotic. Furthermore, it is found that the distribution of the trajectory deflection of the underwater projectile depends on the depth of water. It is also found by measuring the deformation on a witness plate submerged in water, that the impact energy of an underwater projectile is reduced as it penetrates deeper into water.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555, Nagoya, Japan

    Shi Honghui

  2. Space Engineering Division, Space Engineering Development Co., Ltd., Issei Build., Takezono 2-3-12, 305-0032, Tsukuba, Japan

    Takuya Takami

Authors
  1. Shi Honghui
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  2. Takuya Takami
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Additional information

The project supported by Japan Society for the Promotion of Science under a Grant-in-Aid for Scientific Research (C) (Grant No. 12650162)

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Honghui, S., Takami, T. Hydrodynamic behavior of an underwater moving body after water entry. Acta Mech Sinica 17, 35–44 (2001). https://doi.org/10.1007/BF02487768

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  • DOI: https://doi.org/10.1007/BF02487768

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