固体推进剂中铝粉氧化过程及其燃烧效率影响因素

Oxidation Process of Aluminum Powder in Solid Propellant and Influence Factors on Its Combustion Efficiency

在对铝粉氧化过程和单颗粒燃烧过程分析的基础上,总结了导致铝粉团聚的主要因素,讨论了不同因素对铝粉燃烧效率的影响规律。这些因素包括铝粉粒度及含量、氧化剂种类、氧化剂粒度及级配和环境压力。随着铝粉粒度和含量的提高,铝粉燃烧效率降低;而随着氧化剂热值的提高,气相区的温度随之提高,铝粉的燃烧效率相对较高。对细AP而言,随着粒度的增大,铝粉团聚尺寸下降,燃烧效率明显提高;但对于粗AP而言,其粒度对铝粉燃烧效率影响较小。随着压力的提高,铝粉燃烧效率提高,但对于不同推进剂体系,压力的作用程度不同,对于含粗粒度AP的推进剂或铝粉含量较高的推进剂,压力对铝粉燃烧效率的影响较明显。

Based on analyzing aluminum powder oxidation process and single particle combustion process,the main factors resulting in aluminum powder agglomeration are summarized,and the influence rules of different factors on aluminum powder combustion efficiency are discussed.These factors include particle size and content of aluminum powder,oxidizer type,oxidizer particle size and distribution,as well as ambient pressure.The combustion efficiency of aluminum powder decreases with the increase of its particle size and content.The temperature in gas phase zone increases and aluminum powder has the relatively higher combustion efficiency with the increase of oxidizer heat value.For fine AP,the agglomeration particle size of aluminum powder decreases and combustion efficiency obviously increases with the increase of the particle size.But for coarse AP,its particle size has a few effect on the combustion efficiency,the combustion efficiency of aluminum powder increases with the increase of the pressure.However,the influence degree of the pressure is different for different propellant systems.The influence of the pressure on the combustion efficiency of the aluminum powder is more obvious for propellants containing coarse AP or aluminum powder of higher amount.