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含能材料  2009 

不同升温速率下炸药烤燃模拟计算分析

Keywords: 物理化学,固黑铝炸药(GHL),烤燃,点火,数值模拟

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Abstract:

为了研究不同升温速率条件下炸药热反应规律,建立了炸药烤燃模型,利用计算流体力学软件,对固黑铝炸药(GHL)在不同升温速率下的烤燃过程进行了数值模拟计算。采用Arrhenius定律描述炸药自热反应,根据在1K·min-1升温速率下固黑铝炸药烤燃实验测量的温度-时间曲线,确定了固黑铝炸药的活化能和指前因子分别为180.2kJ·mol-1和2.1674s-1;分别对3.3K·h-1,1K·min-1,3K·min-1和10K·min-1四种不同升温速率下固黑铝炸药烤燃过程进行了数值模拟计算分析。结果表明,升温速率对炸药点火时间和点火位置有很大影响。升温速率增大,炸药点火时间缩短,点火位置从炸药内部移向炸药边缘。升温速率对炸药点火温度影响很小,但慢速烤燃下炸药点火时的环境温度比快速烤燃低。

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