Design and verification of heat insulation and slow heat release of a fuze

DOI:	10.11809/bqzbgcxb2023.08.005
Keywords:	slow heat release; fuze; venting area; heat insulation; fast cook off; slow cook off
Abstract:	In order to explore the design method of venting and heat insulation which can meet the requirement of slow heat release of a fuze under a high temperature and high heat environment, this paper obtains the minimum venting area of a fuze with RDX based explosive as the charge, and obtains the back temperature distribution of insulation materials with different thickness at different high temperatures. Fast cook off and slow cook off burning tests are then carried out to verify the simulated parts. The results show that the design of the venting hole can substantially reduce the reaction grade of the explosive cartridge, and the increase of the venting area can strengthen heat release effect. The sealing property of the charge is improved to a certain extent by coating the assembly adhesive in the charge cartridge with a venting hole, and the reaction after the coating is more intense than that without the coating. The coating of heat insulation materials can significantly delay the reaction time of fuze ignition, but its effect on the intensity of reaction is weak.
Published:	2023-08-28
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