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含能材料  2010 

微细圆管中B/KNO3燃烧特性分析

DOI: 10.3969/j.issn.1006-9941.2010.03.021

Keywords: 军事化学,微细圆管,B/KNO3,燃烧特性,热损失,管道阻力

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Abstract:

为了解微细圆管中点火药的燃烧特性,采用高速摄影技术对微细圆管中B/KNO3的燃烧进行实验研究,结果表明:管壁热损失和管道阻力是影响微细圆管中B/KNO3燃烧稳定性的主要因素。圆管内径越小,管壁热损失和管道阻力越大,燃烧越不稳定。B/KNO3在内径1.0~2.0mm石英管中稳定燃烧、燃速变化微弱。燃烧室压强为0.1~4.0MPa时,B/KNO3燃速随压强增加,但并不符合燃速指数规律。当石英管内径减至0.5mm时,燃烧不稳定,燃速随时间延长而变大;圆管内径进一步减小,产生击穿现象导致火焰熄灭。研究还表明在一定壁厚范围内,燃速反比于壁厚。

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