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Ignition and heterogeneous combustion of aluminum boride and boron-aluminum blend

机译：硼化铝和硼铝混合物的点火和非均质燃烧

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摘要

Adding other metals is an efficient method of breaking through the energy release efficiency limitation of boron-based fuels. A laser ignition testing system was used for investigating the ignition and heterogeneous combustion characteristics of aluminum boride and boron-aluminum blend. The emission spectra and combustion flames of the samples during combustion were recorded by a fiber optic spectrometer and a high-speed camera, respectively. The component, morphology, and distribution features of the condensed combustion products (CCPs) were then analyzed using an X-ray diffractometer, a scanning electron microscope, and an X-ray energy dispersive spectrometer. The emission spectral intensity curves show that the boron-aluminum blend has better ignition feature than aluminum boride (the ignition delay time was 45% shorter). However, the combustion intensity and self-sustaining combustion time of boron-aluminum blend are both inferior to those of aluminum boride. In full wave emission spectra of the samples, the characteristic peaks of combustion intermediate products like BO2, AlO, and AlO2 were found. The combustion flames of the two samples were both yellow green and tapered. The variation trend of the flame size corresponded to that of the emission spectral intensity curves. During the first half of the combustion, large amounts of sparks were ejected from the combustion flame of boron-aluminum blend, which caused the acute fluctuation of combustion intensity. B, Al, B2O3, Al2O3, AlN, and Al5O6N were detected in the CCPs of both samples. In addition, the CCPs of aluminum boride contained unburned AlB2 , and those of boron-aluminum blend contained Al4B2O9. Webbed AIN fibers were observed only in the CCPs of boron-aluminum blend, while AlN and Al5O6N whiskers were found in those of both samples. The observed bulks were partially oxidized AlB2 in the CCPs of aluminum boride, or partially oxidized B in those of boron-aluminum blend. As both diffusion and melt-dispersion reactions of aluminum were proceeded during the combustion of boron-aluminum blend, oxidation products of aluminum with different morphology were found in the CCPs of boron-aluminum blend as follows: smooth aluminum spheres with low oxidation degree, rough aluminum oxide spheres with high oxidation degree, empty aluminum oxide shells with hollows or cracks, and fine aluminum oxide particles adhered on the surface of boron bulks. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：添加其他金属是突破硼基燃料能量释放效率限制的有效方法。激光点火测试系统用于研究硼化铝和硼铝混合物的点火和非均质燃烧特性。燃烧期间样品的发射光谱和燃烧火焰分别通过光纤光谱仪和高速相机记录。然后使用X射线衍射仪，扫描电子显微镜和X射线能量色散光谱仪分析冷凝燃烧产物（CCP）的成分，形态和分布特征。发射光谱强度曲线表明，硼铝混合物具有比硼化铝更好的着火特性（着火延迟时间缩短了45％）。但是，硼铝混合物的燃烧强度和自持燃烧时间均低于硼化铝。在样品的全波发射光谱中，发现了燃烧中间产物如BO2，AlO和AlO2的特征峰。两个样品的燃烧火焰均为黄绿色且呈锥形。火焰尺寸的变化趋势与发射光谱强度曲线的变化趋势相对应。在燃烧的前半部分，从硼铝混合物的燃烧火焰中喷出大量火花，这引起燃烧强度的剧烈波动。在两个样品的CCP中都检测到了B，Al，B2O3，Al2O3，AlN和Al5O6N。另外，硼化铝的CCP包含未燃烧的AlB2，硼铝混合物的CCP包含Al4B2O9。仅在硼铝混合物的CCP中观察到网状AIN纤维，而在两个样品中均发现了AlN和Al5O6N晶须。观察到的块在硼化铝的CCP中部分氧化为AlB2，在硼铝混合物的CCP中部分氧化为B。随着铝-硼混合物燃烧过程中铝的扩散和熔融-分散反应的进行，在硼-铝混合物的CCP中发现了不同形态的铝的氧化产物，其表现为：低氧化度的光滑铝球，粗糙的铝球。氧化度高的氧化铝球，空的氧化铝壳，中空或裂纹以及在氧化铝块表面上粘附的氧化铝细颗粒。 （C）2018 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第1期|1081-1091|共11页
  • 作者

    Liang Daolun; Xiao Rui; Liu Jianzhong; Wang Yang;

  • 作者单位

    Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China;

    Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Ind Technol Res Inst, Hangzhou 310018, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum boride; Boron; Aluminum; Ignition; Heterogeneous combustion; Energetic materials;

    机译：硼化铝;硼;铝;点火;非均质燃烧;含能材料;

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