Shock Induced Reaction Process of Ti-Si Reactive Powder
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摘要: 采用二级轻气炮驱动飞片高速冲击样品管引发管中Ti-Si活性粉体的自蔓延反应，研究在冲击加载条件下，Ti-Si活性粉体中冲击波速度与燃烧反应速度的关系。在实验过程中，采用高速相机对自蔓延反应过程中燃烧波和冲击波的传播速度进行测量。实验结果表明：冲击波在活性粉体中的传播速度接近飞片运动的初始速度，并且随着传播距离的增加，冲击波速度明显减小，这一现象在冲击加载纯Si粉的过程中也得到验证；在冲击加载条件下，活性粉体中燃烧反应的燃烧波以每秒几厘米的速度传播，与冲击波在活性粉体中的传播速度相差巨大，未发现两者相互作用的过程，即未出现冲击波传播速度增加的现象。Abstract: To find out whether there exists an increased shock wave velocity when the Ti-Si reactive powder is loaded by shock, we used the gas gun to drive the flyer to impact the active Ti-Si powder and initiate its reaction.In the process of the powder's self-propagating reaction experiment, high speed cameras were used to measure the combustion wave and the shock wave velocity.The experimental results show that the shock wave propagates in the reactive powder at the velocity of a few hundred meters per second, which is close to the initial flyer velocity, and the shock velocity decreases obviously with the increase of the propagation distance.This phenomenon was also verified in the shock loading process of pure Si powder.The combustion wave propagates in the Ti-Si powder at the velocity of a few centimeters per second, which is very different from the velocity of the shock wave, thus suggesting that the phenomenon of an increased shock wave velocity does not exist.
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Key words:
- reactive powder /
- shock /
- combustion /
- high speed camera /
- velocity
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图 1 W丝点燃实验示意图及实物照片
Figure 1. Schematic and physical photos of W filament ignition experiment
图 2 轻气炮冲击加载实验示意图及实物照片
Figure 2. Schematic and physical photos of shock loading experiment by gas gun
图 3 W丝点燃实验回收样品管的线切割照片
Figure 3. Photo of recovered sample tube by line cutting in W filament ignition experiment
图 4 W丝点燃实验中回收样品的XRD图
Figure 4. XRD spectrum of recovered sample in W filament ignition experiment
图 5 W丝点燃实验中高速相机采集到的燃烧波传播过程
Figure 5. Combustion wave propagation recorded by high speed camera in W filament ignition experiment
图 6 飞片速度为1.69km/s时冲击加载纯Si回收样品管线切割照片
Figure 6. Photo of recovered sample tube by line cutting at flyer velocity 1.69km/s in pure Si shock loading experiment
图 7 飞片速度为1.69km/s时冲击加载纯Si实验中，采样频率为15万幅/秒的高速相机采集图像
Figure 7. Photos taken by high speed camera with 150000 frame/s frequency at flyer velocity 1.69km/s in pure Si shock loading experiment
图 8 飞片速度为1.07km/s时冲击Ti-Si活性粉体回收样品管线切割照片
Figure 8. Photo of recovered sample tube by line cutting at flyer velocity 1.07km/s in Ti-Si shock loading experiment
图 10 飞片速度为1.07km/s时冲击Ti-Si活性粉体实验中，采样频率为15万幅/秒的高速相机采集图像
Figure 10. Photos taken by high speed camera with 150000 frame/s frequency at flyer velocity of 1.07km/s in Ti-Si shock loading experiment
图 11 飞片速度为1.68km/s时冲击Ti-Si活性粉体回收样品管线切割照片
Figure 11. Photo of recovered sample tube by line cutting at flyer velocity 1.68km/s in Ti-Si shock loading experiment
图 13 飞片速度为1.68km/s时冲击Ti-Si活性粉体实验中，采样频率为1万幅/秒的高速相机采集图像
Figure 13. Photos taken by high speed camera with 10000 frame/s frequency at flyer velocity 1.68km/s in Ti-Si shock loading experiment
图 14 飞片速度为1.68km/s时冲击Ti-Si活性粉体实验中，采样频率为15万幅/秒的高速相机采集图像(第一阶段)
Figure 14. Photos taken by high speed camera with 150000 frame/s frequency at flyer velocity 1.68km/s in Ti-Si shock loading experiment (1st part)
图 15 飞片速度为1.68km/s时冲击Ti-Si活性粉体实验中，采样频率为15万幅/秒的高速相机采集图像(第二阶段)
Figure 15. Photos taken by high speed camera with 150000 frame/s frequency at flyer velocity 1.68km/s in Ti-Si shock loading experiment (2nd part)
图 16 飞片速度为1.68km/s时冲击Ti-Si活性粉体实验中，采样频率为15万幅/秒的高速相机采集图像(第三阶段)
Figure 16. Photos taken by high speed camera with 150000 frame/s frequency at flyer velocity 1.68km/s in Ti-Si shock loading experiment (3rd part)
表 1 轻气炮冲击加载实验条件
Table 1. Experimental condition of shock loading by gas gun
No. Sample Flyer velocity/
(km/s)Sampling frequency of high speed camera/(frame/s) Low frequency High frequency 1 Ti-Si (Mole ratio 5:3) 1.07 10000 150000 2 Ti-Si (Mole ratio 5:3) 1.68 10000 150000 3 Si 1.33 10000 150000 4 Si 1.69 10000 150000 
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