FOX-7/HMX混合炸药烤燃试验的数值计算

为研究FOX-7/HMX混合炸药的热响应特性,基于热爆炸理论中的热平衡原理,以McGuire-Tarver三步反应模型及成核和生长反应模型分别描述HMX和FOX-7的化学反应过程,建立了FOX-7/HMX混合炸药烤燃过程的计算模型.将建立的计算模型以用户自编函数的方式添加到Fluent软件中,对混合炸药的烤燃过程进行了数值模拟.同时还对FOX-7/HMX混合炸药进行了烤燃试验研究.结果表明:炸药样品中最终发生了燃烧反应.在升温速率为3℃/min的条件下,炸药试样中心处点火温度计算结果和试验结果分别为203.3℃和196.2℃,点火时间计算结果和试验结果分别为3360 s和3444 s;炸药试样1/2半径处点火温度计算结果和试验结果分别为202.1℃和191.6℃,点火时间计算结果和试验结果分别为3360 s和3264 s.模拟计算结果与试验结果基本一致,相对误差能够满足实际预估的需求.

Simulation Study of cook-off test on composite explosives of FOX-7/HMX

in order study the thermal explosion property of FOX-7/HMX-based composite explosives, the simulation model of cook-off test was built on the thermal balance principles of thermal explosion theory. The chemical reaction process of HMX and FOX-7 was illustrated by the McGuire-Tarver three-steps model and nucleation and growth model respectively. Furthermore, the simulation model was added into the FLUENT software and compiled in the user defined function (UDF) form. The cook-off test was simulated by using FLUENT software. Meanwhile, the experimental study of FOX-7/HMX samples were conducted. The results show that the deflagration finally occurs in the explosive samples. Under heating condition of 3°C/min, the ignition temperature of numerical and experimental results are 203.3°C and 196.2°C at the center place of explosive sample, and the ignition time of numerical and experimental results are 3360s and 3444s. Additionally, at the place of half radius of explosive samples, the ignition temperature are 202.1°C and 191.6°C as well as ignition time are 3360s and 3264s for simulation and test results. The simulation results are almost in accordance with the test results, and the relative error can meet the practical requirement.