Abstract：Spherical fuel elements are lifted pneumatically into an array of tubes outside the core in a pebble-bed reactor with the flow in the tubes perpendicular to the flow in the core. Sometimes two fuel elements are very close in the pipeline so they are transported in tandem, which increases the fuel element transportation efficiency. When lifted, the fuel elements may collide with each other with the characteristics of these collisions providing an important basis for evaluating the reliability of the transport system. This study analyzed the flow characteristics in the pipeline using computational fluid dynamics to determine the forces on the fuel elements. A dynamic model of the fuel elements was then developed to describe the impact characteristics. The results demonstrate that the collision force will not damage the fuel elements and that the fuel elements will be lifted together after several collisions. The lifting process is steady and the lifting is efficient. Experimental tests validate the accuracy of the theoretical analysis. This research provides a basis for designing pneumatic transport systems for fuel elements in pebble-bed reactors.
刘洪冰, 黄岸, 常保华, 王力, 都东. 球床堆燃料元件串列提升碰撞过程动力学特征[J]. 清华大学学报（自然科学版）, 2016, 56(9): 1003-1008,1015.
LIU Hongbing, HUANG An, CHANG Baohua, WANG Li, DU Dong. Dynamics characteristics of collisions between fuel elements transported in tandem in a pebble-bed reactor system. Journal of Tsinghua University(Science and Technology), 2016, 56(9): 1003-1008,1015.
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2016, Vol. 56 
