Numerical Simulation of Gunpowder Powder Compaction by Explosion
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摘要:为研究火药粉末爆炸压实过程，借助ANSYS/AUTODYN软件对其进行数值仿真，研究分析了压实过程中粉末材料的运动状态和密度分布情况。结果表明：粉末粒子速度经突跃增长后急速衰减，之后趋于稳定，整个过程约200μs。压实件底部材料密度高于顶部，中心区域高于边缘区域，且随着装药厚度的增加，材料回弹加剧，易导致密度不均，对比发现在药厚15cm左右可取得较好的压实效果。
Abstract:According to the non-free volumetric structure of initiating explosive device, the feasibility of using helium mass spectrum leak testing to detect the gross-leak of the initiating explosive device in the leakproofness test was explored. Through the analysis of the mechanism that the fine-leak detection cannot replace the gross-leak detection in the helium mass spectrum leak testing, the multi-period waiting time and multiple helium mass spectrometry testing verification for different kinds of initiating explosive device, thermal battery and materials were carried out. The results show that, because it is a non-free volume inside the initiating explosive device, helium gas diffuses into the explosive powders through a gross leak hole and then diffuses and holds in them. When testing under the negative pressure, the helium gas releases again from the explosive powders at a relatively slower rate rather than dissipation rapidly. Therefore, it is feasible to use the helium mass spectrum leak test method to detect the gross-leak of the initiating explosive device, so as to avoid the external pollution caused by the gross-leak test and save the test time.
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