破碎浮冰环境下结构物倾斜入水空泡演化特性实验研究

杨帅; 鹿麟; 胡彦晓; 杨哲; 陈凯敏

doi:10.11883/bzycj-2024-0229

破碎浮冰环境下结构物倾斜入水空泡演化特性实验研究

doi: 10.11883/bzycj-2024-0229

杨帅^1,,
鹿麟^{1, 2, ,},
胡彦晓³,
杨哲¹,
陈凯敏¹

1.
中北大学机电工程学院，山西太原 030051
2.
重庆长安望江工业（集团）有限责任公司，重庆 401120
3.
内蒙航天动力机械测试所，内蒙古呼和浩特 010076

基金项目: 国家自然科学基金（52201385）；山西省回国留学人员科研资助项目（2024-114）

详细信息

作者简介:
杨　帅（2000－　），男，硕士研究生，yangshuai_@163.com

通讯作者:
鹿　麟（1988－　），男，博士，副教授，lulin2016@nuc.edu.com

中图分类号: O354; TJ012.3
计量
- 文章访问数: 54
- HTML全文浏览量: 9
- PDF下载量: 16
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-11
- 修回日期: 2024-09-02
- 网络出版日期: 2024-09-06

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

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

摘要

摘要: 为探究破碎浮冰覆盖密度对结构物入水空泡演化的影响，利用高速摄影技术开展了不同破碎浮冰覆盖密度下结构物倾斜入水实验。此外，通过对比不同碎冰覆盖密度工况下的结构物倾斜入水过程，获得了碎冰覆盖密度对结构物倾斜入水空泡演化特性的影响规律。结果表明：与无冰环境相比，当空泡扩张时，破碎浮冰通过阻碍液面流体向外扩张，致使空泡的直径减小；而空泡闭合时，碎冰会阻碍液面流体向内收缩，延长空泡扩张时间，此时空泡内空气总量增加，空泡内外压差减小，最终导致空泡的闭合时间延迟。随着碎冰覆盖密度的逐渐增加，其对液面流体向内收缩的阻碍作用逐渐增强，进一步延缓了空泡的闭合时间，空泡的长度和最大直径也相应增大。碎冰覆盖密度较小的工况在空泡溃灭时会出现指向空泡内部的射流。此外，碎冰覆盖密度较大的工况下，流体的无规则冲击使得空泡壁出现褶皱。随着结构物入水深度的增加，空泡在环境压力作用下会出现深颈缩现象。随着碎冰覆盖密度的逐渐增大，结构物的水下运动速度相较于无冰环境呈现更快的衰减趋势。
- 碎冰环境 /
- 倾斜入水 /
- 入水实验 /
- 空泡演化 /
- 结构物
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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图 1 实验系统示意图

Figure 1. Schematic diagram of the experimental system

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图 2 破碎浮冰工况示意图

Figure 2. Schematic diagram of different crushed ice conditions

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图 3 实验工况示意图

Figure 3. Schematic diagram of the experimental conditions

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图 4 空泡扩张阶段空泡演化图

Figure 4. Cavity evolution in the water-entry cavity expansion stage

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图 5 空泡收缩阶段的空泡演化图像

Figure 5. Cavity evolution in the cavity contraction stage

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图 6 不同入水条件下的流体特征

Figure 6. Flow characteristics under different water-entry conditions

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图 7 空泡闭合阶段的空泡演化图像

Figure 7. Cavity evolution in the cavity closure stage

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图 8 空泡溃灭阶段的空泡演化图像

Figure 8. Cavity evolution in the cavity collapse stage

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图 9 不同工况下的空泡直径变化曲线

Figure 9. Variation curves of cavity diameter under different working conditions

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图 10 不同工况下的空泡长度变化曲线

Figure 10. Variation curves of cavity length under different working conditions

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图 11 不同工况下的结构物速度变化曲线

Figure 11. Velocity decay curves of the structure under different working conditions

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