主催: The Japan Society of Mechanical Engineers
会議名: 第30回 原子力工学国際会議（ICONE30）
開催日: 2023/05/21 - 2023/05/26
This study examines the drag force on the spherical fuel element in the vertical pipe of the fuel handling and storage system for HTRs. The flowing media in this study are high-pressure helium and atmospheric air. The force on the spherical fuel element in the pipe is examined by the simulation computation of the flow field using SST (Shear-Stress Transport) k-ω and LES (Large Eddy Simulation) models. For various inlet flow velocities, the relationship between the drag force on the spherical element in the cylindrical pipe and the inlet flow velocity is computed. Compared with the SST k-ω turbulence model, the LES model simulation data are closer to the experimental results. Results show that the blockage ratio of the sphere to the pipe has a great influence on the drag force of the spherical element. When the blockage ratio exceeds 0.887, the drag force and drag coefficient significantly rise as the blockage ratio rises. The study of the force characteristics of spherical fuel elements in vertical pipes of fuel handling and storage systems provides technical support for improving the efficiency of spherical element transportation. Future investigation on the flow characteristics of narrow spaces around the sphere inside the pipes would support further engineering improvements for the pneumatic transportation of solids.
