大口径锥头弹体高速倾斜入水偏转规律数值模拟

陈建良; 杨璞; 李继承; 陈刚; 邓宏见; 范志庚

doi:10.11883/bzycj-2023-0398

大口径锥头弹体高速倾斜入水偏转规律数值模拟

doi: 10.11883/bzycj-2023-0398

陈建良^{1, 2,},
杨璞^{1, 2},
李继承^{1, 2},
陈刚^{1, 2, ,},
邓宏见^{1, 2},
范志庚^{1, 2}

1.
中国工程物理研究院总体工程研究所，四川绵阳 621999
2.
工程材料与结构冲击振动四川省重点实验室，四川绵阳 621999

基金项目: 四川省自然科学基金杰出青年科学基金（2023NSFSC1913）

详细信息

作者简介:
陈建良（1991－　），男，硕士，工程师，chen729@caep.cn

通讯作者:
陈　刚（1971－　），男，博士，研究员，chengang@caep.cn

中图分类号: O353.4
计量
- 文章访问数: 66
- HTML全文浏览量: 14
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-02
- 修回日期: 2023-12-26
- 网络出版日期: 2024-03-04

Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry

CHEN Jianliang^{1, 2
,},
YANG Pu^{1, 2},
LI Jicheng^{1, 2},
CHEN Gang^{1, 2
, ,},
DENG Hongjian^{1, 2},
FAN Zhigeng^{1, 2}

1.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, Sichuan, China

摘要

摘要: 结合某大口径锥头弹体高速倾斜入水试验，采用任意拉格朗日-欧拉（arbitrary Lagrange-Euler，ALE）流固耦合方法对弹体倾斜入水偏转行为进行数值模拟。研究了弹体以500 m/s高速倾斜入水过程中不同受力模式、载荷变化特征以及弹体发生偏转的力学机理，分析了入水角度对弹体偏转规律的影响。结果表明：在俯仰力矩作用下，弹体均发生抬头方向偏转，且偏转速度呈现先增大后减小的趋势，偏转程度在不同入水角度范围内呈现不同的变化趋势。当入水角度小于15°时，弹体会发生“跳弹”现象；当入水角度为30°~60°时，弹体偏转趋势基本一致，均由初始倾斜状态逐渐转动至水平状态、竖直状态并最终以弹头入水反方向的“出水”姿态向水下运动；当入水角度为75°时，弹体转动至水平状态后，并未继续偏转至竖直状态，弹头以朝斜上方的姿态向水下运动；弹体的入水侵深随入水角度的增大而增大，且增大趋势近似满足指数函数关系。
- 大口径锥头弹体 /
- 高速倾斜入水 /
- 受力模式 /
- 入水角度
Abstract: Integrated with a high-speed oblique water entry test of a large caliber conical nose projectile, the deflection behavior of the projectile obliquely entering water was studied based on the arbitrary Lagrange-Euler (ALE) fluid-structure coupling method. Firstly, based on the experiment of projectile impacting on inclined water tank at high speed, the finite element model was established to simulate the corresponding response characteristics, and the rationality of the numerical model and related method was verified. Secondly, the variation of contact force mode as well as load characteristics of the projectile in the condition of water entry at 500 m/s was analyzed, and the corresponding mechanism was discussed. In addition, the influence of water entry angle on the deflection behavior of projectile was also investigated. Related analysis demonstrated that the projectile will deflect upward due to the effect of pitch moment, and the deflection velocity increases first and then decreases gradually during the entry process. The variation trend of deflection degree is different within different entry angle range. When the entry angle is less than 15°, the projectile usually jumps out of the water. When the entry angle locates in the range of 30°–60°, the deflection trend of projectile is almost the same, i.e., the projectile rotates from the initial tilted state to the horizontal state and further the vertical state, and finally it moves downward with its nose opposite the initial water entry direction. When the entry angle increases to 75°, the projectile cannot continue to rotate to a vertical state after it rotates to a horizontal, instead it moves downward in a tilted state with its nose facing upward. Under different water entry angles, the axial force exerted on the projectile is negative, and it makes the projectile velocity decreases continuously; comparatively, the transverse force is positive, and the peak value decreases with increasing the water entry angle. Moreover, the penetration depth of the projectile increases with the increase of entry angle, and it almost shows an exponential relationship.
- large caliber conical nose projectile /
- high-speed oblique water entry /
- contact force mode /
- entry angle

HTML全文

图 1 弹体和靶体有限元几何模型

Figure 1. Finite element model of the projectile and target

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图 2 弹体斜入水角度定义

Figure 2. Definition of inclined angle for oblique water entry of projectile

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图 3 试验系统示意图（正视图）

Figure 3. Schematic diagram of test system (front view)

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图 4 试验弹体及水箱的有限元模型（正视图）

Figure 4. Finite element model of projectile and water tank (front view)

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图 5 弹体入水偏转过程对比

Figure 5. Comparison of numerical deflection process with test

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图 6 弹体水中姿态对比

Figure 6. Comparison of numerical attitude with test

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图 7 水中空泡形态对比

Figure 7. Comparison of numerical cavity shape with test

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图 8 60°入水角度时弹体入水偏转过程

Figure 8. Trajectory deflection process of the projectile water entry under 60° entry angle

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图 9 弹体受力模式变化示意图

Figure 9. Variation of contact force mode on the penetrator during the penetration

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图 10 60°入水角度时弹体水平和竖直方向的载荷时程曲线

Figure 10. Variation of horizontal force and vertical force on the penetrator under 60° entry angle

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图 11 60°入水角度时弹体锥段和柱段的横向载荷时程曲线

Figure 11. Variation of lateral force of the cone head and cylinder under 60° entry angle

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图 12 60°入水角度时弹体锥段和柱段载荷引起的俯仰力矩时程曲线

Figure 12. Variation of pitch moment of the cone head and cylinder under 60° entry angle

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图 13 60°入水角度时弹体偏转角速度时程曲线

Figure 13. Variation of deflection angular velocity under 60° entry angle

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图 14 60°入水角度时弹体轴向和横向载荷时程曲线

Figure 14. Variation of axial force and lateral force on the penetrator under 60° entry angle

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图 15 不同入水角度时弹体的运动轨迹

Figure 15. Trajectory deflection process of the projectile under different entry angles

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图 16 不同入水角度时弹体的速度变化时程曲线

Figure 16. Variation of the velocity attenuation under different entry angles

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图 17 不同入水角度时弹体水平和竖直方向载荷时程曲线

Figure 17. Variation of horizontal force and vertical force on the penetrator under different entry angles

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图 18 不同入水角度时弹体轴向和横向载荷时程曲线

Figure 18. Variation of axial force and lateral force on the penetrator under different entry angles

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图 19 弹体偏转角和偏转角速度时程曲线

Figure 19. Variation of deflection angle and deflection angular velocity under different entry angles

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图 20 弹体俯仰角变化时程曲线

Figure 20. Variation of pitch angle under different entry angles

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图 21 弹体侵深与入水角度的关系

Figure 21. Relation between penetration depth and entry angles

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表 1 材料Johnson-Cook模型参数^[21-22]

Table 1. Johnson-Cook model parameters of materials^[21-22]

材料	ρ/(kg·m^–3)	E/GPa	ν	c_p/(J·kg^–1·K^–1)	T_r/K	T_m/K	$\dot\varepsilon $/s^–1	A/MPa	B/MPa	n	C
G50	7 620	205	0.28	469.0	300	1765	1	1 445	1 326	0.356	0.005
7A04	2 850	69.35	0.33	921.0	293	878	1	602.5	732.1	0.753	0.014

材料	m	D₁	D₂	D₃	D₄	D₅	c₀/(m·s^–1)	S₁	γ₀	a
G50	1.12	0.10	0.76	1.57	0	0	4280	1.99	2.00	0.46
7A04	1.015	0.059	0.246	–2.41	–0.1	–0.1	5240	1.40	1.97	0.48

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