Numerical Simulation of the Three-Wave Point of RDX-Based Aluminized Explosives
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摘要: 为研究含铝炸药近地空中爆炸的三波点特性，利用ANSYS/AUTODYN显式有限元程序，对3种RDX基含铝炸药HL-01（RDXph）、HL-02（85% RDXph+15% Al）和HL-03（70% RDXph+30% Al）空中爆炸过程进行了模拟。结果表明：计算得到的压力时程曲线与实测压力时程曲线较吻合，且在不同位置处的超压值也接近实验值，说明所建立的模型及状态方程参数选取合理；与经验图表法的对比说明，基于爆热当量的经验图表法不适用于含铝炸药三波点高度的计算，而用数值模拟方法可以较好地获得含铝炸药的三波点高度；同一爆炸高度下，3种炸药的三波点高度由大到小依次为HL-03、HL-02、HL-01；对于同种炸药，三波点高度随着爆炸高度的减小而增加。Abstract: To identify the properties of the three-wave point for aluminized explosives in the near-earth air blast, we simulated the explosion process of 3 kinds of RDX-based aluminized explosives, i.e. HL-01 (RDXph), HL-02 (85% RDXph+15% Al) and HL-03 (70% RDXph+30% Al), using the ANSYS/AUTODYN software.The results show that the pressure histories and the near-earth overpressures obtained from the simulation almost overlapped those measured from the experiment, indicating that the chosen model and parameters were appropriate.The comparison of the simulation results with those from the empirical chart shows that it was not suitable to calculate the height of three-wave point for aluminized explosives from the empirical chart, while it was so by simulation.At the same explosion height, the height sequence of three-wave point was HL-03 > HL-02 > HL-01.For the same explosive, the height of three-wave point increased with the decrease of the explosion height.
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Key words:
- aluminized explosives /
- air explosion /
- numerical simulation /
- three-wave point
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图 8 TNT距离地面不同高度处爆炸的三波点位置
Figure 8. Height of three-wave point for TNT atdifferent blasting heights
图 9 不同炸药三波点高度-爆心距曲线
Figure 9. Height of three-wave point vs. distancefrom blast center
图 10 不同对比炸高下三波点高度-爆心距曲线
Figure 10. Height of three-wave point vs. distance fromblast center at different scaled blasting heights
表 1 炸药JWL状态方程参数
Table 1. Parameters of JWL equation for explosives
Explosive Density/
(g·cm-3)A/
GPaB/
GPaR1 R2 ω E0/
(1010J·m-3)DCJ/
(km·s-1)pCJ/
GPaHL-01 1.673 694.52 13.75 4.55 1.30 0.49 0.96 8.325 29.39 HL-02 1.763 1 897.54 24.77 5.83 1.72 0.35 1.19 8.121 23.91 HL-03 1.865 2 225.42 27.59 5.85 1.73 0.49 1.42 7.879 20.70 
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表 2 HL-01的三波点高度的模拟值与经验值
Table 2. Height of three-wave point for HL-01 gained by simulation and empirical chart
X/m Height of three-wave point/m λH=0.40 m·kg-1/3 λH=0.44 m·kg-1/3 λH=0.60 m·kg-1/3 2.5 0.68 0.38 0.34 3.0 1.12 0.61 0.57 3.5 1.71 0.84 0.81 4.0 2.05 1.15 1.05 4.5 2.74 1.72 1.37 5.0 3.37 2.51 2.05 5.5 4.15 3.11 2.51
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表 3 HL-02的三波点高度的模拟值与经验值
Table 3. Height of three-wave point for HL-02 gained by simulation and empirical chart
X/m Height of three-wave point/m Error between simulationand empirical values/% Simulation Empirical value 2.5 0.66 0.95 43.89 3.0 1.02 1.35 32.31 3.5 1.46 1.80 23.25 4.0 1.90 2.30 21.01 4.5 2.54 2.80 10.20 5.0 3.50 3.60 2.82 5.5 4.21 4.30 2.11
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表 4 冲击波在不同位置处的波速
Table 4. Shock velocity at differentdistances from blast center
X/m Shock velocity/(m·s-1) HL-01 HL-02 HL-03 3.5 1 008 1 139 1 345 4.5 833 856 897 5.5 606 643 706
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