煤粉复合旋流火焰燃烧特性研究(2)——数值模拟

Investigation on the Characteristics of Pulverized Coal Combustion with Complex Swirl Jets (2) —— Numerical Simulation

本文数值模拟了煤粉旋流火焰燃烧过程，燃烧数值计算包括理论物理模型建立，数值方法两个大部分，计算模型处理了气相湍流与燃烧、气固两相流动、煤颗粒燃烧过程和辐射传热等物理化学过程，以ｋ－ε模型模拟湍流流动；ＰＤＦ法模拟气相扩散火焰燃烧；颗粒运动计算颗粒运动少颗粒湍流浓度方程模拟颗粒湍流扩散；通量法计算火焰辐射传热，煤粉颗粒复杂燃烧模型计算了颗粒尺寸、形状变化和颗粒孔隙内部燃烧、表面平度对整个颗粒的燃烧过程影响。计算获得了气相速度分布场、气相ｋ和ε分布场、气相温度场、气相组份场和颗粒浓度场及运动过程，揭示了煤粉复合旋流燃烧特性。

The paper numerically computes the pulverized coal combustion with complex swirl jets. The computing process consists of several parts, fluid turbulent flow, turbulent gaseous chemical reactions, gas solid two phase flow, complex coal particle combustion, and flame radiation. Some advanced models and theories, i.e. the turbulent particle concentration model in gas solid flow and the particle characterization combustion behaviors theories including size, shape, pore and surface are applied in the simulations. The distributions of the temperature, gaseous components and concentration of particle and particle track, flame surface are computed. The results agrce with the experiment well and discover the characteristics of the combustion.