Experimental study on cavity evolution characteristics of an oblique water-entry structure in the crushed floating ice environment

YANG Shuai; LU Lin; HU Yanxiao; YANG Zhe; CHEN Kaimin

doi:10.11883/bzycj-2024-0229

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YANG Shuai, LU Lin, HU Yanxiao, YANG Zhe, CHEN Kaimin. Experimental study on cavity evolution characteristics of an oblique water-entry structure in the crushed floating ice environment[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0229

Citation:

YANG Shuai, LU Lin, HU Yanxiao, YANG Zhe, CHEN Kaimin. Experimental study on cavity evolution characteristics of an oblique water-entry structure in the crushed floating ice environment[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0229

Citation:

YANG Shuai, LU Lin, HU Yanxiao, YANG Zhe, CHEN Kaimin. Experimental study on cavity evolution characteristics of an oblique water-entry structure in the crushed floating ice environment[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0229

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Experimental study on cavity evolution characteristics of an oblique water-entry structure in the crushed floating ice environment

doi: 10.11883/bzycj-2024-0229

YANG Shuai^1
,,
LU Lin^{1, 2
,
,},
HU Yanxiao³,
YANG Zhe¹,
CHEN Kaimin¹

1.
School of Mechatronics Engineering, North University of China, Taiyuan 030051, Shanxi, China
2.
Chongqing Changan Wangjiang Industry (Group) Co., LTD., Chongqing 401120, China
3.
Inner Mongolia Aerospace Power Machinery Testing Institute, Hohhot 010076, Inner Mongolia, China

Received Date: 2024-07-11
Rev Recd Date: 2024-09-02

Available Online: 2024-09-06

Abstract

Abstract

To investigate the influence of the density of crushed ice region on the cavity evolution of a structure, an oblique water-entry experiment of the structure was conducted by high-speed photography technology under different crushed ice cover densities. Moreover, by comparing the water-entry process of the oblique structure in varying densities of crushed ice cover, the influence of crushed ice cover density on cavity evolution during the oblique water-entry process of the structure was obtained. Results indicate that during the cavity expansion, the presence of crushed ice reduces the cavity diameter by impeding the outward expansion of the fluid near the free surface, compared with the ice-free environment. When the cavity closes, crushed ice also impedes the inward contraction of the free surface fluid and prolongs the cavity expansion time. The augmentation in the total volume of air within the cavity results in a decrement of the pressure differential between the inside and outside of the cavity, ultimately leading to a retardation in the cavity closure time. As the coverage density of crushed ice gradually increases, the impedance exerted by the crushed ice on the inward contraction of fluid at the free surface progressively intensifies. This enhanced obstruction from the crushed ice further prolongs the cavity closure time and concurrently augments its length and maximum diameter. In conditions of lower crushed ice densities, jets point to the interior of the cavity when the cavity collapses. Besides, under conditions of higher crushed ice cover densities, the cavity wall is wrinkled by the irregular impact of the fluid. As the submerged depth of the structure increases, the cavity undergoes a deep necking under the influence of ambient pressure. As the coverage density of crushed ice gradually increases, the velocity of the underwater motion of the structure shows a trend of faster decay compared to ice-free environments.
- crushed floating ice environment,
- oblique water-entry,
- water-entry experiment,
- cavity evolution,
- structure

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References(14)

References

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