| 近自由面水下爆炸气泡与破损结构耦合作用机理研究 |
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| 引用本文： | 张之凡,谢宇杰,王成,邓万超,廖全蜜.近自由面水下爆炸气泡与破损结构耦合作用机理研究[J].北京理工大学学报,2022,42(9):909-917. |
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| 作者姓名： | 张之凡 谢宇杰 王成 邓万超 廖全蜜 |
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| 作者单位： | 1.大连理工大学 船舶工程学院, 辽宁, 大连 116024 |
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| 基金项目： | 国家自然科学基金资助项目（11802025）；爆炸科学与技术国家重点实验室（北京理工大学）开放课题（KFJJ21-09M）；辽宁省兴辽英才计划高水平创新创业团队项目（XLYC1908027）；中央高校基本科研业务费专项资金（DUT20RC(3)025）；2020年度广东省普通高校青年创新人才项目（2020KQNCX207） |
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| 摘 要： | 近自由面水下爆炸气泡的动态特性非常复杂，研究其与破损结构的耦合作用机理对于发挥武器的二次攻击毁伤能力具有重要的意义. 基于耦合欧拉-拉格朗日方法，建立了近自由面水下爆炸模型，讨论了（不）完整直角结构近自由面水下爆炸过程中气泡的动态特性，揭示了近自由面水下爆炸气泡与破损结构耦合作用机理. 首先建立近自由面水下爆炸模型，将气泡形态、最大半径、周期等仿真结果与实验数据对比，验证数值模型及计算方法的有效性. 探究了完整和破损结构的存在对近自由面水下爆炸气泡动态特性的影响，发现结构与自由面的共同作用使得气泡出现射流偏折、水冢一侧凹陷和气泡破碎等现象. 结果显示破口尺寸参数γ在0.070~0.085区间内，气泡在结构一侧将形成倾斜射流，破口尺寸的增大对射流的头部宽度、头部速度和倾斜角度呈现明显的正向影响.
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| 关 键 词： | 水下爆炸 气泡 欧拉-拉格朗日方法 破损结构 近自由面 |
| 收稿时间： | 2022-04-29 |
Coupling Mechanism Between Damaged Structure and Underwater Explosion Bubble near Free Surface |
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| Affiliation: | 1.School of Naval Engineering, Dalian University of Technology, Dalian, Liaoning 1160242.State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 1000813.Shenzhen Institute of Information Technology, Shenzhen, Guangdong 518172 |
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| Abstract: | The dynamic characteristics of underwater explosion bubbles near free surface are very complicated, which is of great significance to studying the mechanism of damaged structure subjected to a second attack by weapon. Based on the coupling Euler-Lagrange (CEL) method, a numerical model of near-free surface underwater explosion was established. The dynamic characteristics of the bubbles in the underwater explosion process of the near-free surface of the (intact) right-angle structure were discussed. The coupling mechanism between the near-free surface underwater explosion bubbles and the damaged structure were revealed. Firstly, the underwater explosion model of near-free surface was established. In order to verify the effectiveness of numerical method, the obtained numerical results such as bubble morphology, maximum radius and period were compared with experimental data. The dynamic characteristics of underwater explosion bubbles near complete and damaged structures were compared. It is found that the joint action of structure and free surfaces causes the bubbles to experience jet deflection, depression on the side of the water mound and bubble fragmentation. The results also show that when the hole size of the damaged structure ranges from 0.070 to 0.085 times of bubble radius, a tilting jet is formed on the side of the structure. The increase of the hole size has a significant positive effect on the head width, head speed and tilt angle of the jet. |
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