Of Several Elemental Explosive Combustion Performance And Application

The combustion characteristics and application of several explosives were studied. The combustion parameters such as co-volume and impetus of the studied explosives were obtained through two methods, one is the standard Closed Bomb Test (CBT) and the other is theoretic calculating with VLWR EOS. The calculated values agreed well with experimental data. Furthermore, the VLWR calculated results were used to guide the designation of the combustion pot, whose measured output pressure is close to the designed output value. (l)The Closed Bomb TestThe tested samples included HMD, RDX, HNS-I and B/KNO₃. The combustion p-t curves of each sample were measured through CBT. The co-volume, impetus, combustion velocity coefficient and pressure exponent were obtained through these combustion p-t curves. The test results show that: 1. under giving conditions, two explosives with the same atomic number ratio have similar combustion performances, 2.the pressed charge and the powder charge shows observably different combustion characteristics, 3.within 211.7μm-635.0μm, decreasing the grain size may enhance combustion velocity. (2)Calculation of the combustion parametersThe combustion parameters of HMX, RDX, HNS-I and B/KNO₃ were calculated with VLWR code. The thermodynamic function of boron oxide was fitted by method of the least square to JANAF thermo-chemical table, and their coefficients were determined. At the same time, the composition of combustion products were given out. The calculated combustion parameters agree well with CBT results. The calculated results also show that, for HNS-I explosive, combustion performance changes significantly with loading densities. (3)Application in the combustion potBased on the calculated data and experimental results, the combustion pot was designed, and its output pressure was measured. The measured output pressure was close to the designed value, which indicate that using the calculated value and experimental data to guide the designation of the combustion pot is reasonable and practical.