排序方式: 共有16条查询结果,搜索用时 0 毫秒
1.
2.
为了研究煤粉对管内瓦斯预混火焰传播过程的影响,选用典型煤粉试样将其均匀铺于截面100 mm×100 mm、长1.5 m的有机玻璃方管底部,采用高速摄像机/光电传感器、微细热电偶、压力传感器等测试得到了管内瓦斯火焰传播过程中火焰传播速度、火焰瞬态温度、燃烧压力等参数,并初步分析了煤粉影响瓦斯火焰传播的机制。结果表明:有煤粉时火焰传播速度有所增加,但燃烧反应持续时间明显增长;内铺煤粉时管内火焰温度的半峰宽度增加,测点处瞬态温度曲线呈现出较为明显的“双峰”结构,说明活性的煤粉与瓦斯火焰形成瓦斯-煤粉复合火焰;有无煤粉时燃烧压力峰值差别不大,但有煤粉时压力波脉冲宽度增加。 相似文献
3.
A biconical liner was optimized to improve its penetration ability. Its formation and penetration mechanism was studied through numerical simulation and experiments. And the influence of different liner geometry sizes on the jet performance was analyzed using the orthogonal method. The liner formed the high-speed jet with an explosively formed projectile. The small angle 2α remarkably influenced the jet speed which was inversely proportional to 2α. And the liner thickness t' and large angle 2β had highly significant effect on the projectile speed. The liner was optimized at t' = 0. 14 cm,2α = 50°,2β = 135°,N = 0. 4 or 0. 5,when its jet speed respectively is at 6 613 m /s and 6 839 m /s and projectile speed is at 2 247 m /s and 2 095 m /s,steel target penetration is at 8. 24 cm and 8. 31 cm,and aperture is in 2. 12 cm and 2. 08 cm. The results show that target is penetrated by the high-speed jet and high-speed projectile resulting into double damages. The penetration ability is improved greatly. 相似文献
4.
为了获得的制作工艺简单的孔隙材料,利用水泥和空心玻璃微球制成含有孔隙的复合材料,并将该复合材料制成圆柱壳体,进行水下内爆炸实验。通过水下爆炸测试系统得到了爆炸过程中水中超压波形,并结合高速摄影技术捕捉壳体的变形破坏过程。实验结果表明,药柱爆炸后1.5ms,爆炸载荷在复合材料柱壳中形成破裂分界面;柱壳的破坏类型依次为顶部的气泡脉动、中间的爆炸冲击波的膨胀压缩和底部的应力波的拉伸破坏。结合水中超压经验公式和超压的实测值计算了水中冲击波能量占总爆炸能量的比例,计算结果表明空心玻璃微球-混凝土复合材料对爆炸能量能具有良好的耗散作用。 相似文献
5.
6.
7.
PETN和RDX在无起爆药雷管中作为激发药的对比性研究 总被引:2,自引:2,他引:2
为了探讨激发药对无起爆药雷管延期时间的影响,通过对比PETN和RDX分别作为激发药引起无起爆药雷管延期时间的差异,根据热点起爆理论对数据进行分析.结果表明,对于无起爆药瞬发电雷管,PETN和造粒RDX均可作为激发药,但PETN的延期时间(8.33ms)小于造粒RDX(9.35ms);对于无起爆药非电延期雷管,造粒RDX作为激发药时延期时间稳定,雷管起爆可靠;PETN可作为无起爆药瞬发非电雷管或低段别(12~13段)非电延期雷管的激发药. 相似文献
8.
9.
10.