DNAN 基熔铸炸药成型过程数值仿真

为模拟DNAN 基熔铸炸药成型过程,采用结构网格计算流场和温度场、非结构网格计算应力场的方法,得到DNAN 基熔铸炸药冷却凝固时清晰的固液界面以及合理的缩孔缩松及热应力分布。通过对比研究,在一定模具和装药尺寸条件下,提出减少DNAN 基熔铸炸药装药缩孔缩松、降低热应力极值以及缩短凝固时间的优化方案,方案为模具上表面保温1 h,模具下表面30 益恒温水浴。

Simulation of Solidification Process for DNAN-based Melt-cast Explosives

In order to simulate the pouring and solidification process of DNAN based melt-cast explosives, flow and thermal fields were calculated using structured mesh, and stress field was calculated usingunstructured mesh. This numerical scheme can obtain an accurate interface between solid and liquid,reasonable shrinkage and stress data. By comparison research, on the condition of certain mould andcharge size, the optimized scheme for DNAN-based melt-cast explosives is that thermal insulation on upper mould surface for an hour with 30℃ water on lower mould surface, in order to decrease shrinkage,thermal stress value and solidification time by overall consideration.