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Combustion Characteristics Of Boron Nanoparticles

机译：硼纳米粒子的燃烧特性

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An experimental investigation of the combustion characteristics of boron nanoparticles in the post flame region of a flat flame burner has been conducted. Boron is attractive as a fuel or a fuel supplement in propellants and explosives due to its high heats of combustion on both a gravimetric and volumetric basis. A relatively large database exists for combustion characteristics of large (greater than 1 μm) boron particles, but very little exists for nano-sized boron. Ignition and combustion characteristics have been studied in the post flame region of a fuel lean CH_4/Air/O_2 flame, with burner temperatures ranging from about 1600 K to 1900 K, and oxygen mole fractions ranging between 0.1 and 0.3. As in earlier investigations on boron combustion, a two-stage combustion phenomenon was observed. Ensemble-averaged burning times of boron nanoparticles were obtained, while the ignition time measurements for boron nanoparticles were extended into a lower temperature range previously unavailable in the literature. The measured burning times were between 1.5 ms and 3.0 ms depending on both the temperature and oxygen mole fraction. The ignition times were relatively insensitive to oxygen concentration in the range studied, and were affected only by temperature. The measured ignition times were inversely related to the temperature, ranging from 1.5 ms at 1810 K to 6.0 ms at 1580 K. The burning time results were compared to both diffusion and kinetic limited theories of particle combustion. It was found that the size dependence on particle burning times did not follow either theory.
机译：已经对平板火焰燃烧器的后火焰区域中的硼纳米粒子的燃烧特性进行了实验研究。硼由于在重量和体积两方面都具有很高的燃烧热量，因此在推进剂和炸药中作为燃料或燃料补充剂具有吸引力。对于较大（大于1μm）硼粒子的燃烧特性，存在一个相对较大的数据库，但对于纳米级硼，数据库很少。已经在贫燃料的CH_4 / Air / O_2火焰的后火焰区域中研究了点火和燃烧特性，燃烧器温度在1600 K至1900 K范围内，氧摩尔分数在0.1到0.3之间。如在早期的硼燃烧研究中一样，观察到了两阶段燃烧现象。获得了硼纳米粒子的集合平均燃烧时间，而硼纳米粒子的着火时间测量扩展到了以前文献中所没有的较低温度范围。取决于温度和氧气摩尔分数，测得的燃烧时间在1.5毫秒至3.0毫秒之间。在所研究的范围内，点火时间对氧气浓度相对不敏感，并且仅受温度影响。测得的点火时间与温度成反比，范围从1810 K的1.5 ms到1580 K的6.0 ms。燃烧时间的结果与粒子燃烧的扩散理论和动力学有限理论进行了比较。已发现尺寸对颗粒燃烧时间的依赖性不遵循任何一个理论。

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