Study of Flow and Heat Transfer for the Supercritical Hydrogen in Spallation-Type Cylindrical Neutron Moderator

Energies

卷:14

Yiping Lu¹  Lingbo Zhu²  Songlin Wang²  Tianjiao Liang²  Chaoju Yu²  Youlian Lu²  Jianfei Tong³  Heping Tan³  Shikui Dong³ 

[1] Department of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150001, China;

[2] Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

[3] School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

关键词: spallation neutron source;    cylindrical neutron moderator;    optimization;    numerical method;    supercritical hydrogen;   

DOI  :  10.3390/en14185856

来源: DOAJ

【 摘 要 】

Pipe height in cylindrical neutron moderator is an important factor to flow pattern, temperature distribution and even the neutron characters. In this paper, the steady-state thermal analysis of cold neutron moderator is carrying out with different heights, conjugated heat transfer method and one-way coupled with a neutron transfer software. The different pipe heights, which is the jet-to-surface distances (H/D = 0.5~6), were compared using a 2D moderator model. The results show that vortex size and velocity gradient from container wall to vortex center vary with H/D, the center of recirculation zone nearly remain constant, and heat transfer effect is weakened on the target bottom surface. With H/D increasing, the velocity at bottom target surface is progressively decreased, and cooling effect is poor, leading to the rise in temperature. The optimal range cooling performance is (H/D) = 0.5~1 at Re = 1.7 × 10⁵, and the enhancement of beam power further strengthens the thermal deposition difference between container and liquid hydrogen. The results can be applied to moderator component design and optimization in the future spallation neutron source.

【 授权许可】

Unknown