Data from: Numerical and experimental study of pyrophoric activated metal Mg surface combustion characteristics

The combustion of multi-hole pyrophoric activated metal belongs to solid combustion and the combustion mechanism is quite complex, which is a difficult problem to be solved. Once the pyrophoric activated metal contacting with oxygen, the oxygen diffuses to the interior of the activated metal within plenty of holes and reacts with it, which enlarges the contact area with oxygen. Consequently, the whole combustion is serious and the temperature rises rapidly. To study the combustion mechanism of chaff, surface heat balance equation is established in this work by taking Mg as the activated metal. To solve this equation, the chaff adiabatic wall temperature distribution is computed by computational fluid dynamics (CFD) in the presence of high speed airflow. Then, chaff surface temperature distribution is obtained by solving the heat balance equations. Finally, numerical and experimental results via infrared (IR) thermal imager are compared to demonstrate the effectiveness of the established equation.多孔自燃活性金属的燃烧属于固体燃烧范畴，其燃烧机理极为复杂，是亟待攻克的科学难题。当该自燃活性金属与氧气接触后，氧气会通过其内部大量孔隙扩散至金属内部并发生反应，进而扩大了与氧气的接触面积，由此引发剧烈的整体燃烧，温度快速攀升。为研究箔条的燃烧机理，本文以镁（Mg）作为活性金属，建立了表面热平衡方程。为求解该方程，本文在高速气流环境下，通过计算流体动力学（computational fluid dynamics, CFD）方法计算得到箔条的绝热壁面温度分布；随后通过求解热平衡方程，得到箔条的表面温度分布。最终通过红外（infrared, IR）热像仪获取实验结果，并与数值计算结果进行对比，以验证所建立方程的有效性。