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首页> 外文期刊>Combustion Science and Technology >REFLECTED SHOCK IGNITION AND COMBUSTION OF ALUMINUM AND NANOCOMPOSITE THERMITE POWDERS
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REFLECTED SHOCK IGNITION AND COMBUSTION OF ALUMINUM AND NANOCOMPOSITE THERMITE POWDERS

机译：铝和纳米复合铝热粉末的反射电击和燃烧

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摘要

A comparison of the ignition and combustion characteristics of Al-Fe_2O_3 and Al-MoO_3 nanocomposite powders and two sizes of aluminum powder in inert and oxidizing environments was performed in the region behind a reflected shock in a shock tube. Radiation intensity was monitored by photometry, and temporal information on the particle temperatures was obtained using highspeed pyrometry. In addition, emission spectra were collected to identify intermediate species produced during combustion. In inert environments, both thermite materials showed evidence of ignition within 1-2 ms at 1400 and 1800 K. Particle temperatures during reaction ranging from 2700-3350 K were observed, with Al-MoO_3 having generally higher temperatures than Al-Fe_2O_3. Addition of oxygen in the ambient environment reduced ignition times and increased combustion temperatures to 3350-3800 K as well, suggesting that heterogeneous reactions can enhance the combustion performance of the thermite materials. In air at 3 atm, the nanocomposite thermites and nanoscale aluminum all showed extremely rapid ignition: on the microsecond time scale and under 2000 K. The bulk of the material, however, ignited and burned on much longer time scales of the order of 1 millisecond. Bulk nano- composites were found to ignite as quick or more quickly than bulk, agglomerated nanoscale aluminum and significantly faster than a 5-10 micron aluminum powder.
机译：在激波管中反射激波后面的区域中，比较了惰性和氧化环境中Al-Fe_2O_3和Al-MoO_3纳米复合粉与两种尺寸的铝粉的着火和燃烧特性。通过光度法监测辐射强度，并使用高速高温法获得有关颗粒温度的时间信息。另外，收集发射光谱以鉴定燃烧期间产生的中间物质。在惰性环境中，两种铝热材料均显示出在1400和1800 K下1-2毫秒内着火的迹象。观察到反应期间的颗粒温度为2700-3350 K，其中Al-MoO_3的温度通常高于Al-Fe_2O_3的温度。在周围环境中添加氧气可减少点火时间，并将燃烧温度提高至3350-3800 K，这表明异质反应可增强铝热材料的燃烧性能。在3 atm的空气中，纳米复合铝酸盐和纳米级铝都显示出极快的着火性：在微秒级和2000 K以下。然而，大部分材料在1毫秒量级的较长时间上被点燃和燃烧。 。发现散装的纳米复合材料的点燃速度比散装的，团聚的纳米级铝更快或更快，并且比5-10微米的铝粉快得多。

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