空气中悬浮金属微粒子的燃烧特性

为了揭示悬浮于空气中的金属微粒子的燃烧特性,基于金属的燃烧热、升温及相变过程的热焓,定义用以预测金属燃烧反应相态的两个比例系数Rmp和Rbp,并对一些常用金属的燃烧相态进行了分析预测.另一方面,利用装有光学扩大装置的高速摄像仪对典型金属的铝粒子和铁粒子悬浮在空气中的燃烧现象行进行实验研究,同时用扫描电镜对它们燃烧前后粒子的形态和粒径进行观察分析.实验结果表明：熔点及沸点不同的轻、重金属粒子在空气中的燃烧特性绝然不同,由实验验证得到的铁和铝微粒子的燃烧反应相态与理论预测结果一致.

Combustion Behavior of Metal Particles Suspended in Air

In order to understand the combustion behavior of metal particles suspended in air,two burning ratios(R_(mp) and R_(bp)) were defined to judge the combustion phase of a metal,and the combustion phases of several metals were analyzed based on the values of R_(mp) and R_(bp).On the other hand,the combustion behaviors of the metal particles suspended in air are studied experimentally.Two kinds of metal particles(iron and aluminum particles) of different properties of melting point,boiling point and reactivity were used.The structure and diameter distribution of metal particles were analyzed by using a scanning electron microscope.The combustion zones propagating through the metal particle clouds in an open field are recorded by a high-speed video camera with a microscopic optical system.The results show that the combustion behaviors between the metal particles are distinctly different depending on the melting point and boiling point of the individual metal,and the experimental results agree well with that of the analysis on the combustion phase of a metal.