Experimental study on the cavity evolution and motion characteristics of spheres into water

WANG Heng; SUN Tiezhi; LU Zhonglei; ZHANG Guiyong; ZONG Zhi

doi:10.11883/bzycj-2018-0415

Volume 39 Issue 12

Dec. 2019

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WANG Heng, SUN Tiezhi, LU Zhonglei, ZHANG Guiyong, ZONG Zhi. Experimental study on the cavity evolution and motion characteristics of spheres into water[J]. Explosion And Shock Waves, 2019, 39(12): 123901. doi: 10.11883/bzycj-2018-0415

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WANG Heng, SUN Tiezhi, LU Zhonglei, ZHANG Guiyong, ZONG Zhi. Experimental study on the cavity evolution and motion characteristics of spheres into water[J]. Explosion And Shock Waves, 2019, 39(12): 123901. doi: 10.11883/bzycj-2018-0415

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Experimental study on the cavity evolution and motion characteristics of spheres into water

doi: 10.11883/bzycj-2018-0415

WANG Heng^1
,,
SUN Tiezhi^{1
,
,},
LU Zhonglei²,
ZHANG Guiyong^{1, 3, 4},
ZONG Zhi^{1, 3, 4}

1.
School of Naval Architecture, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
System Design Institute of Mechanical-Electrical Engineering, Beijing 100854, China
3.
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, China
4.
Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China

Received Date: 2018-10-29
Rev Recd Date: 2019-02-19

Available Online: 2019-11-25

Publish Date: 2019-12-01

Abstract

Abstract

Water-entry experiments were carried out by adopting five kinds of surface roughness to explore the effects of surface roughness of water-entry spheres on the evolution of cavities induced the water-entry of the spheres and the motion characteristics of the spheres during the water-entry process of the spheres. The experiments were based on an open water-tank test system. Meanwhile, a high-speed camera was used to record the water-entry processes of the spheres with different surface roughness. The evolutions of cavity, splash and motion characteristics of each sphere were obtained. It is found that the closure of cavity and splash will exert a negative acceleration on the sphere. By comparing the displacement, velocity and acceleration curves of the spheres with different surface roughness, it is found that the sphere with the largest surface roughness will move significantly slower than other spheres after the end of slamming, and that the effects of surface roughness on the sphere motion are mainly reflected in the early period of the water-entry. By analyzing the shrinkage of the cavities connected with the free surface of each sphere after cavity seal, it is found that both the shrinking velocity and acceleration curves take on extreme points, and that the larger the surface roughness of the spheres, the earlier the extreme point appears.
- surface roughness,
- water-entry,
- cavity evolution,
- motion characteristics

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References(17)

References

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