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Comparison on Laser Ignition and Combustion Characteristics of Nano- and Micron-Sized Aluminum

机译：纳米和微米型铝的激光点火和燃烧特性的比较

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摘要

This paper presents a comparative study on the laser-induced ignition and combustion characteristics between nanometer-sized aluminum (nano-Al) and micron-sized aluminum (micro-Al) powder stacks. Six different sizes of Al powders (56.0 nm, 74.4 nm, 93.4 nm for nano-Al and 2.9 mu m, 6.1 mu m, 10.8 mu m for micro-Al) were selected to conduct ignition and combustion experiments, at the same operation conditions in the static air flow with atmospheric temperature and pressure and 55% relative humidity. The results demonstrated that ignition delay time of nano-Al is much lower than that of micro-Al. The size of nano-Al has a weak effect on ignition delay time. Whereas, the size of micro-Al has an exponential effect on ignition delay time. The combustion of nano-Al is more intense and the self-maintenance performance is better than micro-Al. Finally, a comparative model on the ignition and combustion difference between nano-Al and micro-Al was built, which comprehensively considers the influences of particle core size, oxide shell thickness and porosity. This study will be helpful to recognize the difference of ignition and combustion characteristics between nano-Al and micro-Al and promote the application in solid rockets.
机译：本文介绍了纳米型铝（纳米Al）和微米型铝（Micro-Al）粉末堆叠之间的激光诱导的点火和燃烧特性的比较研究。选择六种不同尺寸的Al粉末（56.0nm，74.4nm，93.4nm用于纳米-A1和2.9μm，6.1μm，10.8μm用于微Al），以进行点火和燃烧实验，在相同的操作条件下在静态空气流中，具有大气温度和压力和55％相对湿度。结果表明，纳米Al的点火延迟时间远低于微al。纳米Al的尺寸对点火延迟时间有薄弱。虽然，Micro-A1的大小对点火延迟时间具有指数效应。纳米Al的燃烧更加强烈，自我维护性能优于微al。最后，建立了纳米Al和微铝的点火和燃烧差异的比较模型，其全面考虑了粒子芯尺寸，氧化物壳厚度和孔隙率的影响。本研究将有助于识别纳米 - Al和Micro-Al之间的点火和燃烧特性的差异，并在固体火箭中促进应用。

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