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| Tests for relationship between cavity evolution and motion characteristics of cavity wall during a cylinder entry into water |
| XIA Weixue, WANG Cong, CAO Wei, LI Jiachuan |
| School of Astronautics, Harbin Institute of Technology, Harbin 150001, China |
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Abstract The present study aims to address the water entry cavity evolution of cylinder with lower Froude number. For this purpose, an experiment on water entry cavity of a cylinder with different inclined angles and horizontal velocities is conducted by utilizing a high-speed video camera. The cavity flow phenomena induced by the complex movement cylinder is obtained from the video, and the relationship between cavity evolution and the motion characteristic of cavity wall is analyzed by contrast. The phases of impact water entry cavity are divided according to its motion characteristic. The experimental results demonstrate that, the motion characteristic of cavity wall is closely related to the cavity evolution, so the phases of cavity evolution can be quantitatively divided through the motion characteristic of cavity wall. The cavity evolution is affected seriously by its closure type. There are four phases for the cases that the surface seal occurs, namely, open-cavity, expand-volume cavity, stretch-cavity, and closed-collapsing cavity respectively, and the corresponding boundary time is T=2.8, T=5.4, and T=6.9. When the cases only occur deep seal, the evolution process includes three phases, open-cavity, closed-cavity, and collapsing-cavity respectively. The boundary time for those cases is T=2.8 and T=8.4. The overlapped part doesn’t exist in each cavity evolution phases by the divided way of the motion characteristic of cavity wall.
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Received: 29 January 2019
Published: 28 July 2020
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