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本文针对环形空间内自然对流的研究现状，采用扩大计算区域办法确定边界条件，对一端开口的环形空间进行了将导热、对流、辐射耦合在一起的数值模拟，并加入了氩气的物性，使得计算结果与快中子增殖反应堆的实际情况相一致。计算结果显示，流动呈现两细胞的半循环流动，该结论与前人的研究结果一致。此外，由于采用计算区域整体模拟的办法，同时得出了固体内的温度场。
In this paper, the current situation of natural convection in toroidal space is studied, and the boundary conditions are determined by enlarging the calculation area. Numerical simulations of coupling heat, convection and radiation are carried out on the toroidal space with one end opened, and the physical properties of argon are added. The results are consistent with the actual situation of fast breeder reactors. The calculated results show that the flow shows the half-cycle flow of the two cells, which is consistent with the previous results. In addition, the temperature field inside the solid is obtained at the same time as a result of the overall simulation of the calculation area.