Al基粉末燃料改性方法及点火燃烧特性

摘要

Aluminium,which has high calorific value and high density,is an ideal fuel for powder propellant rocket engine and powder ramjet.In this paper,ignition and combustion characteristics of aluminum under different size and pressure were analyzed,u-sing CO2 laser as ignition source and spectrometer as diagnosis method.The effects of two modification methods as magnalium alloy and assembling 1 micro aluminium particles with HTPB on combustion characteristic were studied.The results show that decreasing particle size and increasing pressure can improve combustion behavior of aluminum particles. Although the ignition delay of magnali-um alloy and reunion aluminium particles are longer than 1 micro aluminum particle,they have faster switching rate for homogeneous reaction and larger intensity of combustion after ignition.Their apparent density increase 46% and 47%, respectively.%铝粉热值高且密度大，是粉末火箭发动机及冲压发动机的理想燃料。使用CO2激光点火结合燃烧光谱诊断方法，分析了不同粒度铝粉在不同压强下的点火燃烧特性，并研究了镁铝合金和使用HTPB将1μm铝粉团聚为大颗粒2种改性方法对铝粉燃烧特性的影响。结果表明，铝粉粒度减小和压强提高都能够提高点火燃烧性能；虽然铝镁合金和团聚铝粉在常压下的点火延迟大于1μm铝粉，但其成功点火后向均相反应的转换速度与燃烧强度都远大于1μm铝粉，且其自然松装密度也分别比1μm铝粉增大46%和47%。