冲击引发Ti-Si活性粉体反应过程研究

Shock Induced Reaction Process of Ti-Si Reactive Powder

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。

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.