Combustion And Explosion Conversion Trials And Applied Research

In this paper, some theories and experiments research about the deflagration to detonation transition(DDT) of the high-energy ignition composition was studied.The optimally mixture of the B-based high-energy ignition composition(BKF₁) was gained by the experiments on DSC thermal analysis,then modified this,which was called BKF2, this composition could enhance the quantity and the pressure of gas.Choose several ignition compositions,such as boron/potassium nitrate /PF resins,black powder/potassium perchlorate/aluminium powder, aluminium powder/copper-oxide powder,which were used for the DDT experiments. As a result,the utmost mass and time of DDT were found in this paper. From the experiments conclusions in the paper,it showed that on the condition of thick confined copper pipe and with the pressure less than 13.8MPa. When the mass of the BKF₁ was 250mg or the mass of the BKF₂ was 200mg,HGL was 600mg,LYFwas 600mg. They could made PETN detonation. HGL could made the RDX detonate as the mass was 600mg ,while LYF made the RDX detonate as the mass was 610mg .The average time that from LYF's deflagration to PETN's detonation was 5.8ms, and the time from LYF's deflagration to RDX's detonate was 6.18ms.Drawed blasting fuses by the lead shell was also studied, and also got the relation among the detonation velocity, the diameter and the density of it. In the paper,the dependability of explode energy of blasting fuse through space attenuation ignite the high energy ignition compositions was learned.For BKF₁ ,as the diameter of the blasting fuse was 2.88mm and the distance of cavum less than 8mm ,the fuse could ignited BKF₁ under different atmospheric pressures. While the diameter of the blasting fuse was 1.7mm with the distance of cavum less than 4mm ,it also could ignited BKF₁ under different atmospheric pressures very well,but when the distance of cavum was longer than 8mm,the probability of the ignition decreased rapidity. At the meantime, the paper showed that for the two kinds of blasting fuses,as the pressure varied from 11MPa to 36 MPa, they ignited compositions very well.It meaned that just in a definite scope pressure, the blasting fuses could ignited the compositions .However, as the fuse diameter was 1.7mm with the distance of cavum longer than 8mm,it could't ignited the Al/CuO.