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含能材料  2013 

粒径和晶形对硼颗粒点火燃烧特性的影响

DOI: 10.3969/j.issn.1006-9941.2013.06.022

Keywords: 航空宇航推进理论与工程,,点火,燃烧,粒径,晶形

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Abstract:

针对粒径和晶形对硼颗粒燃烧的影响机理,利用激光点火系统研究了硼颗粒的点火燃烧特性。结果表明,在25~65μm范围内,晶体硼点火延迟时间随粒径变化无明显规律,点火延迟时间在13~19ms之间。晶体硼和无定形硼燃烧效率均随粒径增加而增加。当粒径小于65μm,硼表面氧化层是影响硼燃烧效率的决定性因素。55μm的晶体硼不仅点火延迟时间最短,而且燃烧最剧烈,表明55μm可能是晶体硼颗粒点火燃烧性能最佳的尺寸。无定形硼的点火延迟时间要远低于晶体硼,燃烧效率、火焰强度及发射光谱强度也比晶体硼高。相对粒径,点火延迟时间对晶形更加敏感,晶形对硼点火燃烧具有更强的影响作用。

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