• 学报（中文） •

### 基于大涡模拟的三维随机球堆积床内湍流流动特性

1. 1. 大连理工大学 海洋能源利用与节能教育部重点实验室， 辽宁 大连 116024； 2. 中国船舶重工集团公司第760研究所， 辽宁 大连 116013
• 通讯作者: 刘宏升(1978-)，男，辽宁省大连市人，副教授，目前主要从事多孔介质燃烧技术的理论与实验研究. 电话(Tel.): 0411-84708460; E-mail: lhsh@dlut.edu.cn.
• 基金资助:
国家自然科学基金面上项目(51576029,51606176)，中央高校基本科研业务费专项(DUT16QY19)

### Large Eddy Simulation on the Turbulence Flow in Three-Dimensional Randomly Pellet Packed Beds

LIU Hongsheng,JIANG Linsong,WU Dan,XIE Maozhao

1. 1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China; 2. The 760th Research Institute of China Shipbuilding Industry Corporation, Dalian 116013, Liaoning, China

Abstract: A three-dimensional random structure model of pellet packed bed for porous media is built based on the discrete element software of LIGGGHTS. The effectiveness of the random model has been verified by the calculation of the macroscopic flow resistance coefficient and the local porosity. A comparative study on the turbulence characteristics and vortex distribution within the porous structure has been carried out employing large eddy simulation (LES) and the conventional k-ε turbulence model. Simulation results show that the random structure model could predict the local porosity and the macroscopic resistance coefficient of the porous medium effectively. For the complex turbulent flow inside the porous structure, LES could give detailed information of the small vortices with diameter of 0.4-2.0mm within the porous structure and demonstrate the complex vortex structure in large pores of the porous medium. Besides, LES could also record the generation and development of the small vortex, and the process of stretching, splitting and disappearing of the large vortex within the local pores in detail, and the results are more consistent with the reality and the basic theory of turbulence. The LES study on turbulence characteristics in the random pellet packed bed in this paper will lay the foundation for the future simulation of filtration combustion.