水下爆炸近场峰值压力的数值模拟

宫翔飞; 刘文韬; 张树道; 杨基明

doi:10.11883/bzycj-2017-0262

水下爆炸近场峰值压力的数值模拟

doi: 10.11883/bzycj-2017-0262

1.
中国科学技术大学近代力学系，安徽合肥 230027
2.
北京应用物理与计算数学研究所，北京 100094

基金项目: 科学挑战专题(TZ2016002，TZ2018001)；国家自然科学基金(11472060)；国防基础科研计划(B1520132012)；北京应用物理与计算数学研究所于敏基金(YMJJ1618-02)

详细信息

作者简介:
宫翔飞（1979－　），男，硕士，副研究员，gong_xiangfei@iapcm.ac.cn

中图分类号: O382.1
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- 被引次数: 0
出版历程
- 收稿日期: 2017-07-13
- 修回日期: 2018-10-10
- 网络出版日期: 2019-03-25
- 刊出日期: 2019-04-01

Numerical simulation of peak pressure in near-field underwater explosion

1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

摘要

摘要:
为了研究水下爆炸近场内的压力状态，使用SPH (smoothed particle hydrodynamics)方法，采用C-J爆轰模型，对水下爆炸过程进行了数值模拟。通过与峰值压力规律和中场内经验公式的比较，验证了程序的可靠性。对水下爆炸过程进行了波系分析，与不同维数水下爆炸的数值模拟结果进行了对比研究。结果表明：比距离R/a=6是波形变化的一个分界点，在R/a＜6的近场范围内，峰值压力的拟合分为两段更合适。另外，对数值结果的lnP_m-ln(R/a)曲线进行了分段幂次拟合，得到了与数值模拟结果非常吻合的拟合曲线。
- 水下爆炸 /
- 峰值压力 /
- 近场 /
- 光滑粒子流体动力学 /
- 维数效应 /
- 幂次拟合
Abstract:
In this work, to obtain the pressure state of underwater explosion in near-field, we numerically simulated the whole process of underwater explosion using the smoothed particle hydrodynamics and adopting the C-J detonation model, and following the empirical formulas, confirmed the laws of the peak pressure, thereby verifying the effectiveness of the numerical program. We also analyzed the waves' propagation in underwater explosion and compared it with the numerical results of underwater explosion in various dimensions. The results show that the distance ratio R/a=6 is a demarcation point in the waves structure, and in the R/a＜6 near-field range the fitted peak pressure curve should be divided into two sections. Further, we performed segmented fitting of the numerical results with power function, and found the fitted curve in good agreement with the numerical results.
- underwater explosion /
- peak pressure /
- near-field /
- smoothed particle hydrodynamics /
- dimension effect /
- power fitting

HTML全文

图 1 不同模型压力的相似率

Figure 1. Similarity of pressure in various models

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图 2 峰值压力计算结果与经验公式的比较

Figure 2. Comparison of peak pressure between calculated results and empirical formula

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图 3 水下爆炸近场内的波系

Figure 3. Waves in near-field underwater explosion

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图 4 峰值压力曲线

Figure 4. Peak pressure curves

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图 5 近场中的lnP_m-ln(R/a)和lnP_m-R/a曲线

Figure 5. lnP_m-ln(R/a) curves and lnP_m-R/a curves in near-field

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图 6 近场中lnP_m-ln(R/a)的拟合曲线

Figure 6. Fitted curve of lnP_m-ln(R/a) in near-field

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图 7 近场中lnP_m-ln(R/a)曲线的一阶和二阶导数

Figure 7. First- and second-order derivatives of lnP_m-ln(R/a) curve in near-field

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图 8 近场中lnP_m-ln(R/a)的分段幂次拟合曲线

Figure 8. Fitted curves of piecewise power of lnP_m-ln(R/a) in near-field

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