摘要
焦炭燃烧是煤燃烧的重要过程,准确模拟焦炭燃烧,深入研究焦炭燃烧的物理规律,对于预测及优化煤燃烧过程有很大意义。间断有限元方法具有良好几何适应性和稳定性,是准确模拟气固两相流动问题的较好方法。然而该方法尚未应用于求解气固两相燃烧,且存在通量重构格式无法应用于动网格计算的问题。本文利用间断有限元方法进行空间离散,结合任意拉格朗日-欧拉方法处理动网格问题,进行了二维流场下焦炭颗粒燃烧过程的直接模拟,并将该方法应用于多个焦炭颗粒运动燃烧的计算,得到了较准确的结果,揭示了单颗粒及运动多颗粒焦炭燃烧过程中流场的变化规律。
Char combustion is an important process of coal combustion. For better prediction and optimization of coal combustion, accurate simulationof char combustion is needed to obtain the physical features in detail.Discontinuous Galerkin（DG） algorithm, which has good stability and geometric adaptivity, is an accurate method for gas-solid flow simulation. However, the DG method has not yet been applied to gas-solid combustion calculation, and the flux reconstruction method for moving mesh has not been developed. In this paper, with the discontinuous Galerkin finite element method applied for spatial discretization and with the Arbitrary Lagrangian-Eulerian method used for the moving mesh, the direct numerical simulation of char particle combustion on two dimensional flow field is conducted. The combustion of multi-moving-particle is also calculated with the above algorithm. The results prove accurate and show the flow field with single particle and moving multi-particle during combustion.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第11期2503-2507,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51390493
No.51476089)
关键词
焦炭燃烧
动网格
间断有限元
直接数值模拟
多颗粒
char combustion
moving mesh
discontinuous Galerkin finite element method
directnumerical simulation
multi-particle
