Study on ignition mechanism of explosive charge with bottom gap in launch environment

As an unavoidable defect in explosive charges, the bottom gap significantly affects launch safety, and revealing the ignition mechanism of explosive charge containing bottom gaps is an urgent problem. Aiming at the bottom gap compression process in launch environment, this paper takes PBX explosive as the research object, establishes the dynamic model of explosive charge with bottom gap, obtains the stress distribution, temperature distribution of explosive charge and pressure change process in the bottom gap, determines that the bottom gap is an important factor affecting temperature, and reveals the hot-spot formation mechanism during the launch process. The results provide a theoretical basis for the study of launch safety of explosive charge.