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本文主要研究球床堆燃料元件球放热分布规律及其主要影响因素。在雷诺数9600到55000范围内,研究了单球、不完整的菱形球床及完整的菱形球床中球元件的放热分布。认为:单球局部放热的强弱主要受边界层发展过程的支配。球床中,边界层的发展受到死点的限制,元件球的放热主要受气流交混扰动的影响;随着雷诺数的增加,元件球平均放热系数升高,放热不均匀系数下降。不同的球阵布置对元件球放热分布有明显的影响。
In this paper, we mainly study the exothermic distribution of ball bed fuel element balls and its main influencing factors. In the range of 9 600 to 55 000 Reynolds number, the heat distributions of single ball, incomplete diamond ball bed and ball elements in a complete diamond ball bed were studied. It is considered that the strength of the local exotherm of a single ball is dominated by the development process of the boundary layer. In the ball bed, the development of the boundary layer is limited by the dead point, and the exothermic heat of the component ball is mainly affected by the mixed disturbance of the air flow. With the increase of the Reynolds number, the average exothermic coefficient of the component ball increases and the exothermic nonuniformity coefficient decreases . Different ball-array arrangements have a significant impact on the exothermic distribution of component balls.