摘要
为了更好地模拟柱形颗粒与石英砂的流动,利用球元重建方法对柱形颗粒进行球元重建.采用大涡模拟中的SGS(sub-grid scale)亚格子模型,对柱形颗粒造成的湍流进行解析.模拟中耦合并行算法,缩短了模型计算时间.基于上述方法,模拟了表观气速为1.5 m/s的柱形颗粒与石英砂的混合流动过程.通过流动瞬时图像和压力脉动分析表明,模拟结果与实验结果相似,表明耦合并行算法能较好地模拟流化床中柱形颗粒与石英砂的流动.当柱形颗粒尺寸较大时,加剧了湍流效应对混合流动的影响.模拟的z方向气体平均速度呈现中间高两边低的对称分布状态,这与床内的气泡和柱形颗粒分布有关,符合实际流化规律.
To simulate the mixing flowof cylindrical particles and quartz sand,the spherical element was used to reconstruct cylindrical particles. A sub-grid scale（ SGS） model was used to analyze the turbulent flow. The coupled parallel algorithm in simulation reduced the computation time. Based on the above method,the mixing flowprocess of cylindrical particles and the quartz sand at 1. 5 m/s was simulated. The simulation results were in good agreement with the experimental results on instantaneous flowand pressure fluctuation. The result shows that the proposed method can simulate the mixing flowof cylindrical particles and the quartz sand in fluidized bed. When the size of cylindrical particles is larger,the influence of the turbulence on mixing flowis aggravated. The average velocity of gas in the z direction is simulated,presenting symmetrical distribution of high in the middle and lowon both sides. This is related to the distribution of bubbles and cylindrical particles in fluidized bed,thus it is in line with the actual fluidization law.
作者
郭飞宏
王泽宇
仲兆平
王肖祎
Guo Feihong Wang Zeyu Zhong Zhaoping Wang Xiaoyi(School of Energy and Environment, Southeast University, Nanjing 210096, China Architectural Design and Research Institute Co. , Ltd. , Southeast University, Nanjing 210096, China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第2期283-290,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(U13161115
51276040)
东南大学优秀博士学位论文培育基金资助项目(YBJJ1644)
关键词
柱形颗粒
石英砂
模拟
球元重建
大涡模拟
并行算法
cylindrical particles
quarts sand
simulation
spherical element reconstruction
large eddy simulation
parallel algorithm
