Interaction of combustible particles with flames occurs in fire scenarios. In this study, numerical investigation of interaction of coal dust or micron-sized particles with lean premixed methane-air flames is presented. A two-dimensional axisymmetric domain is employed to simulate conical premixed flames from lab-scale Bunsen burner. A chemical kinetic mechanism having 25 species and 121 elementary reactions, temperature dependent thermo-physical properties, multi-component diffusion with Soret effect and radiation model accounting for gas and soot radiation are used. Discrete Phase Model (DPM) is used to simulate the transport of coal particles. Coal particles in varies size ranges and concentrations are injected into the premixed reactant mixture at equivalence ratio between 0.75 and 0.85. Multiple species from devolatilization of coal particles are considered to enter the gas-phase. Laminar flame speeds are predicted using numerical shadowgraphs and validated against the experimental data from literature. Injection of coal particles affects the laminar burning velocity and flame structure. The numerical model is able to predict the variation trends in the laminar flame speed data quite reasonably. A detailed analysis of injection of coal particles on the resultant flame dynamics are presented using the fields of temperature, flow, species, net reaction rate, heat release rate and DPM.

在火灾情况下会发生可燃颗粒与火焰的相互作用。在这项研究中，提出了煤尘或微米级颗粒与稀薄的甲烷-空气混合火焰相互作用的数值研究。二维轴对称域用于模拟实验室规模的本生灯燃烧器的锥形预混火焰。使用具有25种和121个基本反应的化学动力学机理，温度依赖性的热物理特性，具有索雷特效应的多组分扩散以及考虑气体和烟尘辐射的辐射模型。离散相模型（DPM）用于模拟煤颗粒的传输。将各种尺寸范围和浓度的煤颗粒以0.75至0.85的当量比注入预混合的反应混合物中。煤颗粒脱挥发分的多种物质被认为进入了气相。层流火焰速度使用数字阴影图预测，并根据文献中的实验数据进行了验证。注入煤颗粒会影响层流燃烧速度和火焰结构。数值模型能够相当合理地预测层流火焰速度数据的变化趋势。使用温度，流量，种类，净反应速率，放热速率和DPM字段，详细分析了煤粉喷射对所得火焰动力学的影响。数值模型能够相当合理地预测层流火焰速度数据的变化趋势。使用温度，流量，种类，净反应速率，放热速率和DPM字段，详细分析了煤粉喷射对所得火焰动力学的影响。数值模型能够相当合理地预测层流火焰速度数据的变化趋势。使用温度，流量，种类，净反应速率，放热速率和DPM字段，详细分析了煤粉喷射对所得火焰动力学的影响。