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采用Speziale-Sarkar-Gatski(SSG)雷诺应力模型对液态金属在堆芯子通道内的流动、传热过程进行计算流体动力学(Computational Fluid Dynamics,CFD)模拟,研究雷诺数(Re)、分子普朗特数(Pr)、格拉晓夫数(Gr)、节径比(P/D)等无量纲参数对湍流换热的影响。比较无量纲对流换热系数(Nu)可以看出,CFD预测值与实验值及经验关系式符合得较好。对各种不同无量纲参数下的计算结果进行分析发现:在P/D和Re数相同条件下,三角形子通道的壁面温度分布比方形更均匀,换热情况更好;提高Re数,增大P/D,选用Pr数大的冷却剂,可有效改善温度和换热的周向分布不均情况;在Re数大于10 000的条件下,浮力对液态金属换热的影响可忽略不计。
The Computational Fluid Dynamics (CFD) simulation of the flow and heat transfer of liquid metal in the core subchannels was carried out by Speziale-Sarkar-Gatski (SSG) Reynolds stress model. Reynolds number (Re) The effects of the dimensionless parameters Pr, Gr, and P / D on turbulent heat transfer were investigated. Comparing the dimensionless convective heat transfer coefficient (Nu), it can be seen that the CFD predictions are in good agreement with the experimental values and empirical relationships. The results of calculation under different dimensionless parameters show that under the same conditions of P / D and Re, the wall temperature distribution of the triangular sub-channel is more uniform than that of the square, and the heat transfer is better; the Re number is increased, P / D, the choice of a large number of Pr coolant can effectively improve the temperature and heat distribution uneven circumferential distribution; Re number is greater than 10 000 under the conditions of buoyancy on the heat transfer of liquid metal negligible.