Hotspot Optical Radiation Characteristics of Energetic Powder DAAF under Intense Impacts
In order to understand the generation and development of hot spots in energetic powders under strong impact,a two-stage light gas gun system was employed to impact diaminofurazan(DAAF)powder.The radiative high-temperature pyrometer was used to observe the thermal radiation characteristics of DAAF powder with different thicknesses under the same impact conditions.Using the Planck formula to fit the gray body model,the apparent temperature and emissivity of DAAF powder were obtained under a flyer plate impact velocity of 1.6 km/s.The results indicate that the hot spot generation temperature for impacting DAAF powder is approximately 3 950 K,and it exhibits a certain cooling trend within a time scale of 200 ns.Moreover,with increasing thickness of the sample,the development of hot spots becomes more sufficient,and hot spot aggregation is more evident in the thickest sample.Within a 200 ns time scale,the emissivity of the samples shows an increasing trend,and it tends to increase with the thickness of the sample.At an impact velocity of 1.6 km/s,a DAAF sample with thickness of 0.645 mm exhibits a phenomenon of deflagration.
Energetic powderDAAF hot spotsOptical radiationGray body model
万方数据
维普
