The numerical simulation of a blast wave of a multilayer composite charge is investigated. A calculation model of the near-field explosion and far-field propagation of the shock wave of a composite charge is established using the AUTODYN finite element program. Results of the near-field and far-field calculations of the shock wave respectively converge at cell sizes of 0.25–0.5 cm and 1–3 cm. The Euler––flux-corrected transport solver is found to be suitable for the far-field calculation after mapping. A numerical simulation is conducted to study the formation, propagation, and interaction of the shock wave of the composite charge for different initiation modes. It is found that the initiation mode obviously affects the shock-wave waveform and pressure distribution of the composite charge. Additionally, it is found that the area of the overpressure distribution is greatest for internal and external simultaneous initiation, and the peak pressure of the shock wave exponentially decays, fitting the calculation formula of the peak overpressure attenuation under different initiation modes, which is obtained and verified by experiment. The difference between numerical and experimental results is less than 10%, and the peak overpressure of both internal and external initiation is 56.12% higher than that of central single-point initiation.

研究了多层复合装药爆炸波的数值模拟。利用AUTODYN有限元程序，建立了复合装药冲击波近场爆炸和远场传播的计算模型。冲击波的近场和远场计算结果分别收敛于0.25–0.5 cm和1-3 cm的像元大小。发现经Euler–flux校正的输运解算器适用于映射后的远场计算。进行了数值模拟，研究了不同起爆模式下复合装药冲击波的形成，传播和相互作用。结果表明，起爆方式明显影响复合装药的冲击波波形和压力分布。另外，结果表明，内部和外部同时起爆时，超压分布的面积最大，冲击波的峰值压力呈指数衰减，拟合了不同起爆方式下峰值过压衰减的计算公式，并得到了验证。实验。数值和实验结果之间的差异小于10％，内部和外部引发的峰值超压都比中心单点引发的峰值高56.12％。