壕沟地形对冲击波传播规律影响的数值模拟

Numerical simulation of the influence of ditch landform on shock wave propagation

为了研究壕沟地形对爆炸冲击波传播规律的影响,基于Autodyn-3D仿真软件,建立了不同宽度和深度壕沟地形及平整地面的触地爆炸数值模型,并通过求解获取了不同地形工况下的冲击波超压及冲量数据。结果显示,随着壕沟宽度的增加,壕沟底部测点3位置的首峰压力逐渐降低,当宽度大于0.7 m后,峰值压力保持不变,但冲量值仍降低;随着壕沟深度的增加,壕沟底部测点3位置的首峰压力也逐渐降低,但冲量值反而增加,当深度大于0.6 m时,峰值压力降低的趋势已不明显。相关结论可为炸药装药在壕沟地形爆炸的威力输出和安全防护提供指导。

In order to study the influence of ditch landform on the propagation of blast wave,varies ditch numerical models with different width and depth were established based on Autodyn-3D software,and the overpressure and impulse data of shock wave were obtained by solving the models.Results show that the first peak pressure of measuring point 3 at the bottom of the ditch decreases gradually with the increase of the ditch width.When the width is greater than 0.7 m,the peak pressure remains constant,but impulse remains decreasing.With the increase of the ditch depth,the first peak pressure of measuring point 3 decreases gradually,but the impulse value increases.When the depth is greater than 0.6 m,the reducted trend of the peak pressure is not obvious.The conclusion can provide guidance for the power output and safety protection of charge exploded in ditch landform.