不同气氛下硼燃烧发射光谱分析及火焰形态研究

Study on Emission Spectroscopy and Flame of Boron Combustion in Different Atmosphere

为了揭示无定形硼粉在各种气氛下的燃烧特性,利用激光点火系统研究了硼粉的燃烧过程,采用先进的光纤光谱仪和高速摄影仪分析了火焰形态以及燃烧过程中的发射光谱。结果表明,硼在纯氮气氛中能自持燃烧,火焰呈现不明显的淡黄色;而在纯氧气氛中的燃烧则非常剧烈,火焰为硼燃烧特有的绿色。硼在纯氧气氛下燃烧发射出明显的BO2光谱及少量的BO光谱,波长547.1nm的谱峰强度最大。在纯氮气氛下未观察到明显的BN发射光谱。与氧气气氛相比,在水蒸气/氧气混合气氛下,没出现明显的BO2发射光谱。在氧氮气氛下,随着氧浓度的降低,波长471,492.9,518.1,547.1,579.1nm的BO2峰始终较为明显,而452和620.2 nm波段的BO2峰则逐渐消失。

In order to reveal the combustion characteristics of amorphous boron powder in different atmosphere,experimental studies were carried out using a laser ignition system. Visible wavelength emission spectraand burning flame were recorded using a spectrometer coupled with a high speed camera. The results show amor-phous boron can maintain self burning in pure N2 with light yellow flame,while the combustion in pure O2 ismuch stronger with a green flame. Spectroscopic data taken in pure O2 show obvious BO2 emission and little BOemission,while those taken in pure N2 show no BN emission. The highest intensity peak of the emission spectrum of the gas-phase reactant BO2 is at wavelength of 547.1 nm. No BO2 emission is detected in O2/H2O environment compared to O2. As the mole fraction of O2 decreases,the BO2 peaks at the wavelengths of 471,492.9,518.1,547.1,579.1 nm are always strong,whereas those of 452 and 620.2 nm gradually fade away in O2/N2 environment.