HMX基含铝压装炸药慢速烤燃点火时刻的压力参量计算  

Calculation of pressure parameters at ignition moment of HMX-based aluminized pressed explosives during slow cook-off

作　　者：郭璐 智小琦[1] 屈可朋[2] 柳星河 贾杰 李劲 GUO Lu;ZHI Xiaoqi;QU Kepeng;LIU Xinghe;JIA Jie;LI Jin(School of Electromechanical Engineering,North University of China,Taiyuan 030051,Shanxi,China;Xi’an Modern Chemistry Research Institute,Xi’an 710065,Shaanxi,China)

机构地区：[1]中北大学机电工程学院,山西太原030051 [2]西安近代化学研究所,陕西西安710065

出　　处：《爆炸与冲击》2024年第6期48-59,共12页Explosion and Shock Waves

摘　　要：为了研究HMX基含铝压装炸药在慢烤过程中点火时刻的压力参量,设计了0.1和1.0℃/min升温速率下的慢烤试验,并对炸药内部进行了多点测温。在此基础上,基于炸药的通用烤燃模型,将HMX的多步分解机制与铝粉反应相结合,并考虑其分解中的相变过程,建立了HMX基含铝压装炸药慢烤反应速率与压力相关的计算模型并进行了数值模拟。试验结果表明,在0.1℃/min的升温速率下,端盖喷出,壳体沿轴向撕开裂缝,无药粉残留,判定炸药发生爆燃反应;在1.0℃/min的升温速率下,壳体发生轻微变形,有部分药粉残留,判定炸药发生燃烧反应。数值研究结果表明,随着热刺激强度的提高,炸药的点火温度呈对数上升趋势,而烤燃弹的反应进度和内部压力呈现指数下降趋势,且烤燃弹内部的反应压力在HMX相变前呈缓慢上升趋势,相变后呈快速上升趋势。In order to study the pressure parameters of HMX-based aluminized pressed explosives at the ignition moment during slow cook-off,slow cook-off tests were designed at 0.1 and 1.0℃/min heating rates,and internal multi-point temperature measurements were taken inside explosives.On this foundation,based on the universal cook-off model of explosives,combining the multi-step decomposition reaction mechanism of HMX-based explosives with the reaction of aluminum powder,and considering the phase transition process in the decomposition of HMX-based explosives,a slow cookoff calculation model for pressure-department reaction rate of HMX-based aluminized pressed explosives is proposed.The calculation model is then written as a user defined function and imported into Ansys Fluent to perform calculations.Slow cookoff tests were conducted on large aspect ratio(5∶1)HMX-based aluminized pressed explosive charges with 4 mm shell thickness at heating rates of 0.1 and 1.0℃/min and compared with simulation results.And then the numerical simulations of the temperature field and internal pressure changes are performed before ignition of the cook-off bomb at heating rates of 0.055,0.1,0.2,0.3,0.5,and 1.0℃/min.It is found that at the heating rate of 0.1℃/min,after the test reaction,the end cover is ejected,the shell is axially cracked,and there is no powder left,so it is judged to be a deflagration reaction;while at the heating rate of 1.0℃/min,the shell is slightly deformed,with some powder left,indicating that a combustion reaction has occurred.The numerical calculations show that as the heat stimulus increases,the ignition temperature of the explosive tends to increase logarithmically,while the extent of reaction and internal pressure of the cook-off bomb tend to decrease exponentially.Before the HMX phase transition,the internal pressure inside the cook-off bomb grows slowly,after the HMX phase transition the pressure grow rapidly increases,and finally it rises sharply near the ignition moment.

关 键 词：慢烤 HMX基含铝压装炸药 通用烤燃模型 升温速率 压力 烤燃弹 

分 类 号：O381[理学—流体力学]