摘要
为理论分析凝聚炸药慢速烤燃过程,及为烤燃研究奠定理论基础,根据炸药的热传导理论方程,利用叠加原理和分离变量法,将炸药非反应性热传导项与自热反应热传导项拆分,推导得到凝聚炸药一维慢速烤燃模型的温度分布解析解。计算并分析自热反应温度最高值所在位置随加热时间的变化规律以及自热反应温度最高值及温度梯度随厚度的变化规律。根据慢烤试验结果,对温度沿轴向的分布情况进行验证;利用数值计算方法对药柱烤燃的点火点位置、点火温度及时间进行验证。研究结果表明:理论确定的点火点位置与试验测量的点火点位置相符,理论确定的计算结果与数值计算结果吻合;对于一维RDX炸药,自热反应最高温度所在位置的变化从始至点火不足2%,即炸药自热反应的最高温度所在位置在烤燃过程中几乎不变;且当炸药厚度达到0.3 m后,随着炸药厚度的增加,点火点位置至边界的距离趋于恒定值0.015 m,炸药内部温度梯度相似。
To theoretically analyze the slow-cook process of condensed explosives and lay a theoretical foundation for the study of cook-off,based on the theoretical equation for heat conduction of explosives,the non-reactive heat conduction and self-heating reaction heat conduction of explosives are separated by using the superposition principle and the method of separating variables.Therefore,an analytical solution of temperature distribution for one-dimensional slow-cook model of condensed explosives is derived.The variation of the location of the maximum temperature of the self-heating reaction with heating time is calculated and studied,along with the variation of maximum temperature of self-heating reaction and temperature gradient with thickness.According to the results of the slow-cook test,the temperature distribution along the axial direction is verified.The ignition position,ignition temperature and ignition time are verified by numerical calculation.The results show that the ignition position determined by theory is consistent with the measured result by experiment.The calculation results determined by theory are consistent with the numerical calculation results.As far as one-dimensional RDX explosives is concerned,the location change of the maximum temperature is less than 2%from beginning to ignition,which can be ignored.Therefore,the location of the maximum temperature of self-heating reaction of explosives is almost unchanged during the slow-cook process.When the thickness of explosive reaches 0.3 m,with the increase of the explosive thickness,the distance from the ignition position to the boundary tends to be a constant value of 0.015 m.The temperature gradients inside these explosives are similar.
作者
张坤
智小琦
肖游
王帅
ZHANG Kun;ZHI Xiaoqi;XIAO You;WANG Shuai(School of Mechanical and Electrical Engineering,North University of China,Taiyuan 030051,Shanxi,China;Department of Intelligent Manufacturing,Automation Research Institute Co.,Ltd.of China South Industries Group Corporation,Mianyang 621000,Sichuan,China;Science and Technology on Aerospace Chemical Power Laboratory,Hubei Institute of Aerospace Chemical Technology,Xiangyang 441003,Hubei,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第4期1139-1147,共9页
Acta Armamentarii
基金
山西省基础研究计划项目(20210302124340)。
关键词
弹药
慢速烤燃
点火点位置
热传导
解析解
ammunition
slow-cook
ignition location
heat conduction
analytic solution
