Due to its high energy and safety characteristics,3,4-dinitropyrazole(DNP)-based melt-cast explos-ives hold great promise in the field of energetic materials.Studying the thermal safety of these explosives is cru-cial to provide theoretical and experimental support for their engineering applications.To explore the thermal re-sponse characteristics of DNP-based melt-cast explosives,experimental cook-off tests were conducted to monit-or their internal temperature variations of projectiles with dimensions of φ60 mm×240 mm under a heating rate of 60 ℃/h.Additionally,a numerical simulation model of the cook-off test was established using Fluent soft-ware.Upon validating the simulation method,the evolution of temperature field over time during the cook-off process was analyzed,and further investigations were conducted on the effects of heating rate and projectile placement on the simulation results.The results indicate that the response of the cook-off test is characterized by deflagration.The deviation between experimental response parameters and simulation results is within 5％,pre-liminarily verifying the reliability of the numerical model.The heating rate significantly affects the response time,temperature,and area of the cook-off projectile,while the placement method mainly influences the distribu-tion of its response area.
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