为建立动爆冲击波超压的工程计算模型，开展了球形装药动爆试验和数值模拟研究，获取了动爆冲击波场演化历程图像，定量分析了装药速度对冲击波波阵面传播速度的影响。结果表明：在装药速度影响下爆轰产物各向膨胀速度不再相同，爆轰产物膨胀速度的变化使得冲击波强度和空间位置分布发生了相应的变化，正向冲击波强度更高，更早与爆轰产物相分离。在静爆冲击波演化模型的基础上，通过引入含有角度和传播时间的修正因子，建立了静动爆关联的球形装药动爆冲击波超压计算模型。采用该模型计算得到的不同速度、不同药量球形装药冲击波压力与试验结果吻合较好，模型具有一定普适性。
Abstract
In order to establish the engineering calculation model of dynamic explosion shock wave overpressure, the dynamic explosion test and numerical simulation research of spherical charge were carried out, the evolution process image of dynamic explosion shock wave field was obtained, and the influence of charge speed on the propagation speed of shock wave front was quantitatively analyzed. The results show that under the influence of charge velocity, the expansion velocity of detonation products in all directions is no longer the same. The change of the expansion velocity of detonation products makes the corresponding changes in the strength and spatial distribution of shock waves. The strength of forward shock waves is higher and they are separated from detonation products earlier. On the basis of the evolution model of static explosion shock wave, by introducing a correction factor containing angle and propagation time, a calculation model of dynamic explosion shock wave overpressure of spherical charge associated with static and dynamic explosion is established. The shock wave pressures of spherical charges with different velocities and different charges calculated by the model are in good agreement with the experimental results, and the model is of certain universality.
关键词
空中爆炸 /
运动装药 /
冲击波波阵面 /
超压计算模型
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Key words
air blast /
moving charge /
shock wave front /
overpressure calculation model
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