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含能材料  2014 

火灾环境下含炸药结构传热问题的数值模拟

DOI: 10.3969/j.issn.1006-9941.2014.05.008

Keywords: 传热学,火灾环境,含炸药结构,热响应数值模拟,热点火延滞时间

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Abstract:

为了解火灾环境下含炸药结构的热响应行为,针对其涉及的主要传热学问题,建立了池火灾火焰温升数值模型,碳/酚醛烧蚀层高温热解吸热数值模型,空气夹层复合传热数值模型,以及炸药受热分解放热数值模型。用所建数值模型,计算并获得了含炸药结构在不同温升条件下(恒定值1073K、1273K及本研究所提的火焰实测温升曲线)、不同火焰辐射率(0.1~0.9)和不同空气夹层间壳体表面辐射率(0.1~0.9)下的温度响应和热点火延滞时间。结果表明:火烧30min情况下,火焰温度为1273K时,内部炸药在28.92min已经发生热点火现象。火焰温度为1073K和实测温升曲线时,内部炸药最高温度分别为448K和535K。火焰辐射率从0.9降低到0.1时,内部炸药最高温度由535.4K降低到344.6K,热点火延滞时间由1917s增加到3520s。空气夹层间壳体表面辐射率由0.9降低到0.1时,内部炸药最高温度由535.4K降低到329.0K,热点火延滞时间由1917s增加到3739s。

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