带气囊航行体下落入水冲击过程数值模拟

段金雄; 陆德顺; 林威; 孙铁志

doi:10.11883/bzycj-2023-0170

带气囊航行体下落入水冲击过程数值模拟

doi: 10.11883/bzycj-2023-0170

大连理工大学，船舶工程学院，工业装备结构分析优化与CAE软件全国重点实验室，辽宁大连 116024

基金项目: 国家自然科学基金面上项目(52071062)

详细信息

作者简介:
段金雄（1998－　），男，硕士研究生，ychdjx2536843982@163.com

通讯作者:
孙铁志（1986－　），男，博士，教授，suntiezhi@dlut.edu.cn

中图分类号: O
计量
- 文章访问数: 55
- HTML全文浏览量: 4
- PDF下载量: 41
- 被引次数: 0
出版历程
- 收稿日期: 2023-01-01
- 网络出版日期: 2023-09-12

Numerical simulation on water entry impact process of the vehicle with airbags

State Key Laboratory of Structural Analysis and Optimization for Industrial Equipment and CAE Software, School of Naval Architecture, Dalian University of Technology, Dalian 116024, Liaoning, China

摘要

摘要: 为探究带气囊航行体下落入水过程中的运动演化过程以及载荷作用特性，基于VOF（Volume of Fluid）多相流模型和k-ω SST湍流模型，开展了带气囊航行体倾斜下落入水冲击过程的数值模拟。通过将数值计算得到的水平圆柱入水过程空泡形态以及下落位移与试验结果进行对比，验证了所采用的数值方法的适用性与准确性，并分析了带气囊航行体倾斜下落入水过程中航行体的运动演化过程以及载荷作用特性。结果表明，航行体下落入水过程分为了冲击入水阶段与升沉衰减阶段，其中航行体尾部砰击，气囊砰击以及气囊加速展开等过程均会形成局部冲击加速度峰值，并且气囊加速展开砰击水体造成的加速度峰值最大；其次，气囊冲击入水过程中的气囊冲击受力会导致气囊与航行体之间的设计连杆出现较大的拉力峰值；最后，入水空泡溃灭载荷会造成航行体局部压力波动，极大影响航行体的入水姿态变化。综合分析认为气囊装置可以为航行体下落入水提供较好的缓冲保护，计算所得到的带气囊航行体下落冲击响应数据可以为航行体缓冲回收装置设计提供参考依据。
- 航行体入水 /
- 入水冲击 /
- 缓冲气囊 /
- 砰击载荷
Abstract: To investigate the motion evolution process and load action characteristics of a vehicle with airbags falling into water, based on the VOF (Volume of Fluid) multiphase flow model and the k-ω SST turbulence model, the numerical simulation of the inclined falling water impact process of a vehicle with airbags was conducted. The applicability and accuracy of the numerical method were verified by comparing the water entry cavity shape and falling displacement obtained from numerical calculations during the horizontal cylinder’s water entry process with experimental results. The motion evolution process and load action characteristics of a vehicle with airbags during the inclined falling into water process were analyzed. The results show that the process of the vehicle falling into the water is divided into two stages: the impact into the water stage and the heave attenuation stage. Among them, the tail attack of the vehicle, the airbags attack, and the airbags acceleration deployment process all form local peak impact acceleration, and the acceleration peak caused by the airbag acceleration deployment attacking the water body is the highest. The impact force of the airbags will cause a significant tensile peak in the design connecting rod between the airbags and the vehicle during the process of airbag impact entering the water. The collapse load of the water entry cavity will cause local pressure fluctuations of the vehicle, greatly affecting the changes in the vehicle’s water entry attitude. In general, the airbag device can provide good buffering protection for the vehicle falling into water, and the calculated impact response data of the vehicle with airbags can provide a reference for the design of the vehicle's buffer recovery device.
- vehicle entering water /
- water entry impact /
- buffer airbags /
- slamming load

HTML全文

图 1 水平圆柱入水空泡形态试验与数值结果对比

Figure 1. Comparison of experimental and numerical results of horizontal cylinder water-entry cavity shape

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图 2 水平圆柱下落过程质心位置时历曲线对比

Figure 2. Comparison of the time history curve of horizontal cylinder’s centroid position during falling process

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图 3 计算模型具体设计与尺寸

Figure 3. Computational model specific design and size

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图 4 计算域尺寸及其设置

Figure 4. Computing domains size and settings

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图 5 计算域网格

Figure 5. Mesh of computing domains

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图 6 航行体初始下落位置

Figure 6. Initial drop position of vehicle

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图 7 气囊转动角度时历曲线

Figure 7. Time history curve of rotation angle of airbag

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图 8 航行体下落过程

Figure 8. The process of vehicle falling

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图 9 航行体垂直位移时历曲线

Figure 9. Vertical displacement time history curve of vehicle

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图 10 航行体垂直速度时历曲线

Figure 10. Vertical velocity time history curve of vehicle

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图 11 航行体水平位移时历曲线

Figure 11. Horizontal displacement time history curve of vehicle

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图 12 航行体俯仰角度时历曲线

Figure 12. Pitch angle time history curve of vehicle

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图 13 航行体垂直受力时历曲线

Figure 13. Vertical force time history curve of vehicle

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图 14 航行体水平受力时历曲线

Figure 14. Horizontal force time history curve of vehicle

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图 15 航行体入水空泡演化过程

Figure 15. Evolution of water-entry cavity of vehicle

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图 16 航行体俯仰力矩时历曲线

Figure 16. Pitching moment time history curve of vehicle

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图 17 气囊受力时历曲线

Figure 17. Force time history curves of airbags

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图 18 气囊a表面压力等值线分布

Figure 18. Surface pressure contour distribution of airbag a

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图 19 气囊a表面压力分布雷达图

Figure 19. Surface pressure distribution radar map of airbag a

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图 20 压力监测点位置分布

Figure 20. Location distribution of pressure monitoring points

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图 21 流场压力演化云图

Figure 21. Flow field pressure evolution contour

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图 22 顶部监测点压强变化曲线

Figure 22. Pressure change curve at the top monitoring point

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图 23 底部监测点压强变化曲线

Figure 23. Pressure change curve at the bottom monitoring point

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图 24 侧流端监测点压强变化曲线

Figure 24. Pressure change curve at the side flow end monitoring points

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图 25 低压空泡气团的发展过程

Figure 25. The development process of low pressure cavitation air mass

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图 26 迎流端监测点压强曲线

Figure 26. Pressure curve at upstream end monitoring points

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图 27 背流端监测点压强曲线

Figure 27. Pressure curve at backflow end monitoring points

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