模块装药快速烤燃特性的数值预测

Numerical Prediction of Fast Cook-off Characteristics for Modular Charges

为了研究模块装药的热安全性,基于可燃药盒材料和单基药的化学反应机理,建立了模块装药的二维非稳态烤燃模型。在外界升温速率为1～10 K·min^(-1)下,分析了模块装药的快速烤燃响应特性。结果表明,模块装药最初的着火位置均是在靠近可燃药盒内壁面左右两侧的单基药中,点火区为两个环形响应区。随着升温速率的提高,环形响应区将从单基药内向药盒内壁面方向移动,但外界升温速率的变化对模块装药点火位置的影响较小。在1,6,10 K·min^(-1)升温速率下,单基药发生烤燃响应的点火温度分别为458.2,453.9 K和455.7 K,与文献中实验所测得的点火温度(443～463 K)基本吻合。外界升温速率的变化对模块装药发生烤燃响应的点火温度影响较小,但随着升温速率的提高,模块装药发生烤燃响应的点火时间呈指数型衰减。

To investigate the thermal safety of modular charge,based on the chemical reaction mechanism of combustible car- tridge material and single-base propellant,a two-dimensional unsteady state cook-off model of modular charge was established. The fast cook-off response characteristics of modular charge were analyzed at the external heating rates of 1-10 K·min^-1 . The results show that the initial ignition position of modular charges is all in single-base propellant on the left and right sides near the in- ner wall surface of combustible cartridge material,and the ignition zones are two circular response zones. With increasing the heating rate,the circular response zone will move from the inside of single-base propellant to the inner wall of combustible cartridge material,but the change in external heating rates has little effect on the ignition position of modular charge. At the heating rates of 1,6 K·min^-1 and 10 K·min^-1 ,the temperatures occurring the cook-off response of single-base propellant are 458.2, 453.9 K and 455.7 K,respectively,which are basically consistent with the ignition temperatures(443-463 K)measured by ex- periments. The change in external heating rate has little effect on the ignition temperature occurring the cook-off response of mod- ular charge,but the ignition time occurring the cook-off response of modular charge reveals an exponential decay with increasing the heating rate.