Effect of flyer diameters on the combustion characteristics of short pulse impact initiations

The flyer diameter is an important factor affecting short pulse impact. The impact initiation test of 1,3,5- Triamino-2,4,6- Trinitrobenzene (TATB) was carried out by changing the flyer diameter. By measuring the depth and diameter of the combustion pit, the combustion intensity of the sample propellant column under different flyers diameter was analysed. The results show that under the condition of a small flyer diameter, changing the flyer diameter has little effect on the combustion intensity of PBXN-7. When the flyer diameter is large, because of the change in the fracture mode, the depth of the combustion pit generated by the TATB combustion initially increases and then decreases with an increasing flyer diameter; When PBXN-7 and TATB explode, the diameter of the accelerated chamber is reduced when the flyer diameter is less than 1.8 mm and 4.5 mm, respectively. When the flyer diameter is larger than 1.8 mm and 4.5 mm, the expansion of the bore diameter is accelerated. The intensity of the combustion is reflected by measuring the ablation range of the combustion. Under the influence of furrows in the combustion pit, the greater the combustion intensity of PBXN-7 is, the greater the ablation range.