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Modeling combustion of micron-sized iron dust particles during flame propagation in a vertical duct

机译：模拟垂直管道中火焰传播过程中微米级铁尘颗粒的燃烧

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In this study, an attempt has been made to investigate the fundamental aspects of premixed flame propagation in micro-iron dust particles. An analytical model of a one-dimensional dust flame is developed, with the particle combustion time modeled as a function of particle diameter. The flame structure is assumed to consist of two sections: preheat and combustion zone. By solving the energy equation in each zone and matching the temperature and heat flux at the interfacial boundaries, explicit algebraic equations for the laminar flame velocity and maximum flame temperature are obtained. The analysis allows for the investigation of the effects of particle size, and dust concentration on the combustion characteristics of iron dust clouds. This study explains that for micron-sized and larger iron particles the combustion time is proportional to d~2. Besides, flame velocity can be correlated with the particle size according to a d~(-m) relationship, with m=1. The calculated values of the combustion time and flame velocity show a reasonable compatibility with the experimental data.
机译：在这项研究中，已经尝试研究预混合火焰在微铁粉尘颗粒中传播的基本方面。建立了一维粉尘火焰的分析模型，并将颗粒燃烧时间建模为粒径的函数。假定火焰结构由两部分组成：预热区和燃烧区。通过求解每个区域中的能量方程，并匹配界面边界处的温度和热通量，可以获得层流火焰速度和最高火焰温度的显式代数方程。该分析允许研究粒径，粉尘浓度对铁尘云燃烧特性的影响。这项研究解释说，对于微米级和更大的铁颗粒，燃烧时间与d〜2成正比。此外，火焰速度可以根据d〜（-m）关系与粒径相关，其中m = 1。燃烧时间和火焰速度的计算值与实验数据显示出合理的兼容性。

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