Thermal Safety Analysis Of Modular Charge

Under external thermal stimulation,Ammunition has the risk of accidental ignition and detonation,which will cause serious damage to the combatants and weapon launching platforms.Based on the thermal safety of energetic materials as the engineering background,research on thermal safety of modular charge is carried out.The main research contents and results are as follows:?1?The experiment of high-pressure combustion characteristics of the combustible cartridge of modular charge was carried out,and the energy characteristic parameters of the combustible cartridge were obtainedA closed explosive test platform was built,and the combustion test of combustible cartridge was carried out using the transient pressure test system,and the p-t curve was obtained.The combustion model of combustible cartridge is established based on the interior ballistic theory.The calculation software of Visual Basic 6.0 is used to obtain the energy characteristic parameters,burning rate index and burning rate coefficient of combustible cartridge.The calculation results show that the force capacity of the combustible cartridge is f=6.62×10⁵J·kg^-1,and the residual capacity is ?=7.96×10^-4m³·kg^-1.The relationship between burning rate and pressure is as follows:????2?The numerical simulation of the burning process of modular charge was carried out,revealing the response characteristics of the burning process under different heating conditionsA two-dimensional unsteady-state burning model of the modular charge was established,and the computational fluid dynamics software Fluent software was used to numerically analyze the fast and slow burning characteristics of a modular charge.The calculation results show that the initial ignition position of the modular charge at the heating rate of 1¹0K·min^-1is a circular response zone on the left and right sides of the single-base propellant near the inner wall of the combustible cartridge.With the increase of the heating rate,the ignition position will move to the outer wall of the single-base propellant,but the effect is small.When the heating rate of modular charge is between 1.8K·h^-11 and 5.25K·h^-1,the modular charge only produces an annular burning response area.When the heating rate is between5.25K·h^-1and 7.2K·h^-1,the modular charge changes from a central annular burning response area to two annular burning response areas symmetric about the radial center section.?3?The research on the burning characteristics of modular charge detained in gun bore was carried out,and the factors affecting the thermal safety were clarifiedAiming at the retention of ammunition in bore after artillery fire,the two-dimensional burning model of the modular charge was established,and the response characteristic of the modular charge in three different shooting environment,shooting modes and module numbers were analyzed.The calculation results show that under the same shooting environment and the same number of modules,the response time of burning of modular charge is shorter under the condition of 1/min continuous shooting?b shooting mode?and mixed velocity shooting?c shooting mode?than that under the condition of 5/min continuous shooting?a shooting mode?;In the low temperature environment,no matter how many modular boxes are filled,the fire response will not occur after the artillery is fired in a shooting mode.At the same shooting environment and in the same shooting mode,the more modular boxes are filled,the longer the time for modular charge to reach the response temperature is.At the same shooting mode and the same number of modules,the fastest response to the burning of the modular charge is the high temperature shooting environment,followed by the normal temperature shooting environment,and the slowest is the low temperature shooting environment.