炸药熔铸过程数值模拟研究

采用数值模拟方法研究了熔铸炸药常压和加压条件下凝固过程中的温度场,得到了温度的冷却曲线、固液界面的变化过程以及缩孔缩松缺陷可能出现的位置。常压条件下关注位置的计算温度值与实测温度值误差在10%以内;加压在5~20个大气压之间时,随着压力的增大,炸药件的缩孔缩松缺陷显著减少。模拟结果表明加压凝固工艺能有效地消除熔铸炸药的缩孔缩松缺陷。

Numerical simulation of melt-cast explosive solidification process

The temperature field during solidification process of melt-cast explosive under adscititious pressure and atmospheric pressure is studied by adopting numerical simulation method. The cooling curves of temperature, the change process of solid-liquid interface, and the positions where shrinkage defects may appear are obtained. Under atmospheric conditions, the error of temperature value for the positions of interest between computation and measurement is below10%; under adscititious pressure between 5 atm and 20 atm, the melt-cast explosive shrinkage defects reduce significantly as the pressure increases. The simulation results show that the pressurized solidification process can effectively eliminate melt-cast explosive shrinkage defects.