Factors affecting the ignition of a large length-to-diameter ratio igniter tube filled with consolidated charge
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摘要: 利用计算程序对影响大长径比、高密实火药床点火管点火性能的主要因素进行了对比模拟，讨论了不同结构尺寸和装填条件下的点传火性能，通过对计算结果的分析，总结了结构参数和装填条件对大长径比、高密实火药床点火管点传火性能的影响规律：小孔直径、首孔高度、单位长度小孔面积及装填密度显著影响点火压力及点传火性能；小孔直径、首孔高度及单位长度小孔面积是影响破膜后泄压速度的主要因素，而装填密度会影响药床的透气性及火焰传播的通畅性，均对点火安全性、瞬时性及一致性产生重要影响作用。Abstract: The main factors which influence ignition performance of igniter tube with large ratio of length to diameter and consolidated charge were compared by simulation with the calculation program, and the ignition performance was analyzed in different construction parameters and charge conditions. The influence law is summarized on construction parameters and charge conditions of igniter tube by analysis of the results. The diameter of fire hole, the height of the first hole, the hole area in unit length and charge density evidently effect on the ignition pressure and ignition characteristics. The diameter of fire hole, the height of the first hole, the hole area in unit length are the primary influencing factors of decompressing velocity after the diaphragm breaking, and the charge density effects on the permeability of charge bed and free movement of flame propagation. All of four factors evidently effect on the safety, the transient characteristics and the conformance of ignition.
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Key words:
- mechanics of explosion /
- ignition /
- comparative simulation /
- igniter tube /
- two-phase flow /
- interior ballistics
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图 2 小孔直径为1.5 mm时不同时刻燃气压力点火管的轴向分布
Figure 2. Pressure distribution in axial of the igniter tube with the hole diameter of 1.5 mm at different times
图 3 小孔直径为1.8 mm时不同时刻燃气压力点火管的轴向分布
Figure 3. Pressure distribution in axial of the igniter tube with the hole diameter of 1.8 mm at different times
图 4 小孔直径为2.0 mm时不同时刻燃气压力点火管的轴向分布
Figure 4. Pressure distribution in axial of the igniter tube with the hole diameter of 2.0 mm at different times
图 5 距点火端16.7D处不同小孔直径下的压力时程曲线
Figure 5. p-t contrast curves of different hole size at the position of 16.7D
图 6 首孔高度为15 mm时不同时刻燃气压力沿点火管的轴向分布
Figure 6. Pressure distribution in axial of the igniter tube with first hole height of 15 mm at different times
图 7 首孔高度为22 mm时不同时刻燃气压力沿点火管的轴向分布
Figure 7. Pressure distribution in axial of the igniter tube with first hole height of 22 mm at different times
图 8 首孔高度为32 mm时不同时刻燃气压力沿点火管的轴向分布
Figure 8. Pressure distribution in axial of the igniter tube with first hole height of 32 mm at different times
图 9 距点火端16.7D处不同首孔高度下的压力时程曲线
Figure 9. p-t contrast curves of different first hole size at the position of 16.7D
图 10 每排10个小孔时不同时刻燃气压力沿点火管的轴向分布
Figure 10. Pressure distribution in axial of the igniter tube of 10 holes in a row at different times
图 11 每排8个小孔时不同时刻燃气压力沿点火管的轴向分布
Figure 11. Pressure distribution in axial of the igniter tube of 8 holes in a row at different times
图 12 每排6个小孔时不同时刻燃气压力沿点火管的轴向分布
Figure 12. Pressure distribution in axial of the igniter tube of 6 holes in a row at different times
图 13 距点火端16.7D处每排孔个数不同时的压力时程曲线
Figure 13. p-t contrast curves of different hole count at the position of 16.7D
图 14 装填密度为1 036 kg/m3时不同时刻燃气压力沿点火管的轴向分布
Figure 14. Pressure distribution in axial of the igniter tube with charge density of 1 036 kg/m3 at different times
图 15 装填密度为924 kg/m3时不同时刻燃气压力沿点火管的轴向分布
Figure 15. Pressure distribution in axial of the igniter tube with charge density of 924 kg/m3 at different times
图 16 装填密度为840 kg/m3时不同时刻燃气压力沿点火管的轴向分布
Figure 16. Pressure distribution in axial of the igniter tube with charge density of 840 kg/m3 at different times
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