化工学报Issue(7)：2724-2732,9.DOI:10.3969/j.issn.0438-1157.2014.07.033
基于DEM模拟的气固鼓泡床内流场间歇性及颗粒相干结构的分析
Analysis of flow field intermittency and coherent structure of particles based on DEM simulation of gas-solids bubbling bed
摘要
Abstract
The gas-solids flow in a bubbling bed was simulated by the combination approach of computational fluid dynamics (CFD) and discrete element method (DEM), and the simulation results were used to investigate the microscopic characteristics of bubbles and particles. The particle fluctuating energy spectrum was calculated to find out the flow field intermittency in the bubbling bed. Different features of flow field intermittency were found at different locations of bubbling bed by comparing the flatness factor of fluctuation velocity of particles. With increasing bed height, flow field intermittency was weakened. Along the radial direction, the flow field intermittency in the transition region was stronger than that in the wall and center region. Continuous wavelet transform was used to investigate the coherent structure of particles and its evolution process, as well as the relation between coherent structure of particles and flow behavior of bubbles and particles on different scales.关键词
流化床/多相流/计算流体力学/离散元方法/小波分析Key words
fluidized-bed/multiphase flow/computational fluid dynamics/discrete element method/wavelet analysis分类
能源科技引用本文复制引用
吴迎亚,蓝兴英,高金森..基于DEM模拟的气固鼓泡床内流场间歇性及颗粒相干结构的分析[J].化工学报,2014,(7):2724-2732,9.基金项目
国家自然科学基金项目（91334104）；国家重点基础研究发展计划项目（）；教育部新世纪优秀人才支持计划项目2020619（NCET-13-1027）。@@@@supported by the National Natural Science Foundation of China (91334104), the National Basic Research Program of China (2020619) and the New Century Excellent Talents Program in University (NCET-13-1027) （91334104）
