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8223729 
Journal Article 
长管强约束条件下压装PBX炸药点火实验研究 
Qiu, T; Wen, S; Li, T; Hu, H; Fu, H; Shang, H 
2020 
Explosion and Shock Waves 
40 
1 
Chinese 
In order to investigate whether the reaction evolution of pressed HMX-based PBXs inside long thick wall steel tube initiated by ignition composition leads to detonation finally or not, a new experiment apparatus was designed based on traditional DDT tube, in which the strength of tube at specific locations is enhanced, and multichannel PDV probes and high speed photography were used to diagnose the expansion process and rupture characteristics of tube wall. Compared with the results initiated by detonator in the same explosives and confinement, the reaction durations of detonation and ignition differed by orders of magnitude; the pressure evolution measured by tube wall velocities, and the propagation process of tube wall movement were significantly different in two reactions. Analysis shows that the convective flow of reaction products along the seam between tube wall and explosives, high temperature and pressure, dominated the reaction evolution of PBX-A initiated by ignition composition under strong confinement, and appeared as laminar burning on explosive surface and structural response of confinement. There is no reaction activated in explosive bulk by the ramp wave caused by upper stream non shock initiation reaction, least of all DDT. © 2020, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved. 
Convective flow; DDT; Laminar burning; Pressed PBX