球床式高温气冷堆球流及球床辐射的理论与实验研究进展

球床堆芯的球流及等效导热系数是直接影响球床式高温气冷堆设计、运行和安全的重要依据，具有重要的意义。清华大学核能与新能源技术研究院近年对球流和球床等效导热系数进行了实验测量、理论研究和数值模拟，全面深入地揭示了球流规律、球流纺及径向内扩散规律、球床几何优化、物性参数影响、球流流态表征及刻画、球床等效导热系数建模等。本文对此进行了回顾总结，并指出了下一步的研究方向。

Theoretical and Experimental Research Progress on Pebble Flow and Effective Thermal Conductivity in Pebble-type HTGR

Pebble flow and effective thermal conductivity are essential for design, operating, and safety analysis of pebble-type HTGR. The Institute of Nuclear and New Energy Technology at Tsinghua University has recently conducted experimental, theoretical and simulation studies on the pebble flow and effective thermal conductivity. The mechanisms of pebble flow, pebble spindle and radial diffusion, geometrical optimization of pebble bed, effects of physical parameters, pebble flow regime characterization, and modeling methods of thermal radiation in pebble beds have been well explored.After a comprehensive review, the next research program was pointed out in the paper.