带环形密闭气囊弹体入水冲击过程的数值分析

陈洋; 吴亮; 曾国伟; 周俊汝

doi:10.11883/bzycj-2017-0387

带环形密闭气囊弹体入水冲击过程的数值分析

doi: 10.11883/bzycj-2017-0387

陈洋^{1, 2},
吴亮^{1, 2, ,},
曾国伟¹,
周俊汝^{1, 2}

1.
武汉科技大学理学院工程力学系, 湖北武汉 430065
2.
中铁港航-武汉科技大学爆破技术研究中心, 湖北武汉 430065

基金项目:

国家自然科学基金项目 51004079

国家自然科学基金项目 51479147

国家自然科学基金项目 11602178

湖北省自然科学基金项目 2014CFB822

详细信息

作者简介:
陈洋(1994-), 男, 硕士研究生

通讯作者:
吴亮, wuliangwust@sina.com

中图分类号: O39;V244
计量
- 文章访问数: 5445
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- PDF下载量: 131
- 被引次数: 0
出版历程
- 收稿日期: 2017-10-26
- 修回日期: 2018-01-02
- 刊出日期: 2018-09-25

Numerical analysis of the water entry process of a projectile with a circular airbag

CHEN Yang^{1, 2},
WU Liang^{1, 2
, ,},
ZENG Guowei¹,
ZHOU Junru^{1, 2}

1.
Department of Engineering Mechanics, School of Science, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
2.
Blasting Technology Research Center, CRPCE-WUST, Wuhan 430065, Hubei, China

摘要

摘要: 针对带环形密闭气囊弹体入水冲击问题，基于LS-DYNA，运用控制体积法模拟环形密闭气囊，结合流固耦合算法，模拟了某弹体及附带环形密闭气囊入水过程。将入水过程分为弹体砰水、气囊着水、入水减速、水中悬停、缓慢上浮、上浮出水、水面漂浮7个主要阶段，对比分析了垂直与倾斜入水过程中不同阶段弹体和气囊的姿态变化、减速特性及入水深度等特征的异同。从气囊内压变化、流体对气囊的作用合力、气囊内压与入水速度的关系等方面研究了流体与气囊的相互作用，发现入水过程中气囊内压的变化主要受入水深度、运动速度、连接绳拉力等因素影响。通过计算不同初始内压条件下弹体的入水深度、减速时间及连接绳的拉力峰值，发现囊压越高，入水深度越小，减速时间越短，但是相应连接绳对弹体外壳的拉力峰值越大。因此，在进行入水回收气囊参数设计时，需要综合考虑缓冲效果、减速效果及气囊安全性等因素。
- 密闭气囊 /
- 入水冲击 /
- 控制体积法 /
- 流固耦合 /
- LS-DYNA
Abstract: Using the control volume method to describe annular an airtight airbag, we simulated the water entry process of a projectile and its annular airtight airbag based on LS-DYNA combined with the fluid-solid coupling algorithm. We divided this process into seven stages, i.e. those of the projectile slamming water, its air bag falling into water, decelerating in water-entry, hovering in water, floating upward in water, floating out of water, floating on the water surface. We analyzed the projectile's attitude change, deceleration, water entry depth and airbag in different stages in vertical and oblique water-entry. Then we examined the interaction between water and the airbag, covering the changes of the internal pressure, the resultant force of water to the airbag, the relationship between airbag's internal pressure and speed of the water-entry. The results show that the change of the internal pressure of the airbag is mainly affected by the water-entry depth, the movement speed, and the tension of the connecting rope. Further, we calculated the water-entry depth, the deceleration time and the tension peak of the connecting rope under the airbag's different initial internal pressures, and found that the water-entry depth and the deceleration time decrease with the increase of the airbag's initial pressure, while the tension peak of the corresponding connecting rope exhibited an opposite tendency. Therefore, it is necessary to consider the buffering effect, deceleration effect, airbag safety and other factors in the design of airbag parameters.
- airtight airbag /
- water-entry impact /
- control volume method /
- fluid-solid coupling /
- LS-DYNA

HTML全文

图 1 气囊与弹体模型

Figure 1. Airbag and projectile model

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图 2 计算模型示意

Figure 2. Schematic diagram of calculation model

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图 3 有限元模型

Figure 3. Finite element model

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图 4 流体压力静平衡状态

Figure 4. Static equilibrium state of fluid pressure

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图 5 垂直入射全过程

Figure 5. Processes of vertical incidence

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图 6 弹体头部节点的竖向速度时程曲线

Figure 6. Vertical velocity history curve of projectile's head node

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图 7 弹体头部节点的竖向位移时程曲线

Figure 7. Vertical displacement history curve of projectile's head node

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图 8 斜入射全过程

Figure 8. Process of oblique incidence

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图 9 弹体头部节点的竖向和水平速度时程曲线

Figure 9. Vertical and horizontal velocity history curves of projectile's head node

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图 10 弹体头部节点的竖向和水平位移时程曲线

Figure 10. Vertical and horizontal displacement history curves of projectile's head node

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图 11 弹体角速度时程曲线

Figure 11. Angular velocity history curve of projectile

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图 12 弹体角位移时程曲线

Figure 12. Angular displacement curve of projectile

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图 13 气囊内压变化曲线

Figure 13. Internal pressure change curve of airbag

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图 14 流体对气囊的作用力合力时程曲线

Figure 14. Time history curve of fluid force on airbag

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图 15 囊压峰值与初始速度的关系曲线

Figure 15. Relationship between peak value of airbag internal pressure and initial velocity

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图 16 入水深度与初始囊压的关系曲线

Figure 16. Relationship between water entry depth and initial airbag internal pressure

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图 17 减速时间与初始囊压的关系曲线

Figure 17. Relationship between deceleration time and initial airbag internal pressure

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图 18 连接绳拉力峰值与初始囊压的关系曲线

Figure 18. Relationship between peak tension of connecting rope and initial airbag internal pressure

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表 1 气囊和连接绳的材料参数

Table 1. Material parameters of the airbag and corresponding rope

材料	ρ/(kg·m^-3)	μ	E/GPa
气囊	875	0.2	0.557
连接绳	840	0.2	21.9

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表 2 水和空气参数

Table 2. Parameters of water and air

材料	ρ/(kg·m^-3)	p_c/Pa	ν/(mPa·s)	C/(m·s^-1)	S₁	S₂	S₃	γ₀
水	998	-10 000	870	1 480	2.56	-1.99	0.227	0.5
空气	1.185	-10	0.018 4	340	0	0	0	1.4

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