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基于Bruggeman有效介质理论与反向蒙特卡罗法计算了轴对称高温氧化铝粒子流在轴线正侧向辐射强度分布。采用Bruggeman有效介质理论计算多相态共存氧化铝粒子以及含少量炭黑杂质的氧化铝粒子的等效光学常数,以此为基础,通过反向蒙特卡罗法考察氧化铝粒子相变过程以及粒子中少量炭黑杂质对粒子流场轴线上辐射特性的影响。发现粒子相变过程中多相共存状态对高温粒子流场紫外波段辐射信号的影响不可忽略,氧化铝粒子中含有少量炭黑杂质就能够明显降低粒子流高温区间轴线上光谱辐射强度,当波长增加到近红外波段时,离喷口较近处轴线正侧向相对光谱辐射强度随着含炭黑量的增加而增大。
Based on the Bruggeman effective medium theory and the inverse Monte-Carlo method, the axial distribution of axial symmetry high temperature alumina particle flow in the positive axis direction was calculated. The equivalent optical constants of polyphase coexisting alumina particles and alumina particles containing a small amount of carbon black impurities were calculated using the Bruggeman effective medium theory. Based on this, the phase transitions of the alumina particles and the phase transition of the particles Influence of Small Amount of Carbon Black Impurities on Radiation Characteristics on the Axis of Particle Flow Field. It is found that the influence of multiphase coexistence state on the radiation signal in the UV band of the high temperature particles can not be neglected. The alumina particles containing a small amount of carbon black impurities can significantly reduce the spectral radiation intensity along the axis of high temperature particles. When the wavelength increases In the near infrared band, the relative spectral irradiance at the positive side of the axis closer to the orifice increases with the increase of the amount of carbon black.