Numerical Simulation on a Novel Dynamic Pressure Desensitization Device for Emulsion Explosives
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摘要: 利用LS-DYNA动力学有限元软件，对新型乳化炸药动压减敏装置的作用过程进行了三维数值模拟，研究了该装置在水下爆炸过程中的流场分布特征，及其结构设计对实验结果的影响。对比研究结果表明，新型乳化炸药动压减敏装置中, 受压乳化炸药之间的排距是影响实验精度的关键因素，当乳化炸药的半径为2cm、主发药RDX的质量为10g时，乳化炸药的最小排距(即前排乳化炸药对后排乳化炸药影响最小时的排距)为20cm。因此，在乳化炸药动态减敏实验开展之前，可以通过数值模拟的手段预先确定最小排距，减小实验误差。该方法可为乳化炸药动压减敏的后续深入研究提供参考。Abstract: By using the dynamic finite element software LS-DYNA, we simulated the working process of a novel emulsion explosive pressure desensitization device, and investigated the characteristics of its flow field distribution and the influence of its structural design on the experimental results.The comparison of simulation and experiment results shows that the row spacing is the critical factor that determines the degree of accuracy in experiment.For the novel dynamic pressure desensitization equipment, when the radius of the emulsion explosive is 2cm and the weight of RDX is 10g, the smallest row spacing, which minimizes the effect of the emulsion explosive in the front row on that in the back row, is determined as 20cm.Therefore, in order to decrease the experiment error, we can decide on the smallest row spacing through numerical simulation before the dynamic desensitization experiments take place.Our work can serve as a reference for the further research.
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图 1 传统的冲击波动压减敏实验原理图
Figure 1. Schematic of traditional dynamicpressure desensitization experiment
图 2 改进后的冲击波动压减敏实验原理图
Figure 2. Schematic of improved dynamicpressure desensitization experiment
图 4 不同时刻(t)新型动压减敏装置的流场分布特征图
Figure 4. Flow field distribution of new dynamic pressure desensitization device at different time
图 5 若干临界位置处冲击波压力时程曲线与无阻挡情况的比较
Figure 5. Comparison of shock wave pressure-history at several critical positions with unblocked condition
图 6 乳化炸药后不同位置处冲击波的压力时程曲线与无阻挡情况的比较
Figure 6. Comparison of shock wave pressure-history at several positions behind the emulsion explosive with unblocked condition
表 1 水的Mie-Grüneisen状态方程参数
Table 1. State parameters of Mie-Grüneisen equation for water
C/(m/s) S1 S2 S3 γ0 a 1480 1.92 0 0 0.35 0 
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表 2 乳化炸药的阻挡对若干临界位置处冲击波压力的影响
Table 2. The influence of emulsion explosive on the shock wave at several critical positions
Spacing from theRDX/(cm) Peak pressure/(MPa) Influencing degree/(%) With a block Without a block 24 77.6 77.6 0 26 44.1 47.5 7.2 50 23.1 23.2 0.4
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表 3 前排乳化炸药的阻挡对其后不同位置处冲击波压力的影响
Table 3. The influence of emulsion explosive of front row on the shock wave at different following positions
Spacing from emulsion explosiveof the 1st row/(cm) Peak pressure/(MPa) Influencing degree/(%) With a block Without a block 10 35.5 36.5 2.7 15 31.6 31.8 0.6 20 27.0 27.1 0.4 25 23.1 23.2 0.4
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