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首页> 外文期刊>Applied Mathematical Modelling >A 3D modeling of static and forward smoldering combustion in a packed bed of materials
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A 3D modeling of static and forward smoldering combustion in a packed bed of materials

机译：在填充床中进行静态和正向阴燃的3D建模

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摘要

A three-dimensional (3D) model based on the first principles of mass, momentum and energy was developed that numerically simulates the processes of static and forward smoldering in a porous packed bed of plant materials. The packed bed contains cellulose material or tobacco (cigarette) wrapped in a porous paper and surrounded by an ambient air. Other major characteristics of the model are including the effects of buoyancy forces in the flow field, separate treatment of solid and gas in a thermally non-equilibrium environment, and use of multi-precursor kinetic models for the pyro-lysis of staring material and oxidation of char. The changes in porosity due to pyrolysis and char oxidation and the effect of porosity on the bed permeability and gas diffusivity are included. The mass, momentum, energy, and species transport equations are solved in a discretized computational domain using a commercially available computational fluid dynamics (CFD) code. The simulation results show that the model reasonably reproduces the major features of a burning cigarette during smoldering and puffing and are in a good agreement with the existing experimental results for cigarettes. Results include the velocity profiles, gas and solid temperatures, coal shape, burn rates, profile and transport of gas and vapor species throughout the packed bed, dilution through the wrapper paper and ventilation in the filter section, and the mass fraction of some pyrolysis and oxidation products in the mainstream and sidestream flows.
机译：建立了基于质量，动量和能量第一原理的三维（3D）模型，该模型数值模拟了多孔多孔植物床中的静态和正向阴燃过程。填充床包含用多孔纸包裹并被环境空气包围的纤维素材料或烟草（香烟）。该模型的其他主要特征包括流场中的浮力的影响，在热非平衡环境中对固体和气体的单独处理以及使用多前体动力学模型对凝视物质进行热解和氧化的字符。包括由于热解和焦炭氧化引起的孔隙度变化以及孔隙度对床渗透率和气体扩散率的影响。使用可商购的计算流体动力学（CFD）代码在离散的计算域中求解质量，动量，能量和物质传输方程。仿真结果表明，该模型合理地再现了阴燃和膨化过程中燃烧着的香烟的主要特征，与现有的香烟实验结果吻合良好。结果包括速度分布，气体和固体温度，煤的形状，燃烧速率，气体和蒸气物种在整个填充床中的分布和传输，通过包装纸稀释和过滤器部分的通风以及某些热解和热解的质量分数。主流和支流中的氧化产物。

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