含不同粒度铝粉的铝/冰燃料的燃烧特性

用微米铝粉逐级取代部分纳米铝粉制备铝/冰燃料，采用表面接触法和高速摄影技术研究了不同粒度铝粉改善铝/冰燃料燃烧特性的效果. 结果表明，随微米铝粉取代量增加，铝/冰燃料燃烧反应速率和剧烈程度均先提高后降低，微米铝粉取代量为30%(w)时，铝/冰燃料最高升温速率达6062.24℃/s，是纯纳米铝/冰燃料的3.8倍. 用微米铝粉取代部分纳米铝粉均不同程度提高铝/冰燃料的燃面传播速率，微米铝粉取代量约为20%(w)时燃烧性能最佳，燃面传播速率较纯纳米铝/冰燃料提高57.8%. 在分析实验结果的基础上，建立了铝/冰燃料的燃烧火焰模型.

Combustion Characteristics of Aluminum/Ice Fuel with Different Particle Sizes of Aluminum Powder

The combustion characteristics of aluminum/ice fuel which was prepared by using micron-aluminum powder gradually replacing part of nano-aluminum powder were studied by surface contact method and high-speed photography technique. The results showed that the combustion reaction rate and violence of the reaction of aluminum/ice fuel first increased and then decreased with increasing of replaced amount of micro-aluminum. When the replaced amount of micron-aluminum powder reached about 30%, the maximum heating rate was up to 6062.24℃/s, being 3.8 times faster than the pure nano-aluminum/ice fuel. The burning surface propagation rate of aluminum/ice fuel was improved to different degrees when the micron-aluminum powder replaced the part of nano-aluminum powder. When the replaced amount of micron-aluminum powder reached approximate 20%, the combustion performance of aluminum/ice fuel was the best. Furthermore, the burning surface propagation rate was increased by 57.8% over that of pure nano-aluminum/ice fuel. On the basis of the above analysis, the combustion flame model of aluminum/ice fuel was established.