典型 DNAN 基熔铸炸药燃速特性

The reaction evolution model of constrained charge after ignition is the theoretical basis for the design of safe munition release mechanism, and the explosive burning rate-pressure relationship is an important part of the reaction evolution model. To provide a foundation for the design of safety munition reaction violence control for 2, 4-dinitroanisole (DNAN) -based melt-cast explosives, an experimental measurement system for closed bomb burning rate-pressure characteristics is established based on the laser ignition technology and the fast-response thermocouple flame front detection technology. The burning rate-pressure relationship of a typical DNAN-based melt-cast explosive RB-2(DNAN / HMX / Al / binder) was obtained through experiment,and the effect of temperature on the burning rate-pressure characteristics of the explosive was investigated. The results show that the burning rate of RB-2 explosives increases and the pressure index increases with the increase in temperature. At the same time,the higher the pressure is,the more significant the effect of temperature on the burning rate is. When RB-2 explosive is subjected to a pressure of 60 MPa,its solid structure will fail to result in a rapid increase in the burning rate and shift the combustion mechanism of explosive from the linear conduction combustion to the convective combustion. Compared to melt-cast B explosives, RB-2 explosives exhibit lower burning rates and pressure index,along with higher structural failure pressures of the explosives. The reaction growth after accidental ignition is slower,and the reaction violence is regulated more easily through the reaction release structure.