论文部分内容阅读
以水和真实堆芯熔融物为工质,对BALI试验研究的IVR长期冷却条件下内热源驱动湍流自然对流传热现象进行了二维大涡模拟。通过对下边界局部热流密度的面积加权积分,得到了三维下边界换热量。结果表明,数值计算得到的水工质上下边界Nu数与BALI试验和ACOPO的传热关联式计算值符合较好。真实熔融物工质的计算结果表明,Pr数降低会显著减小熔融池向上边界的传热,从而减轻金属层侧壁的热聚焦效应,增加了IVR的热工安全裕量。
Two-dimensional large-eddy simulation of internal convection-driven turbulent heat convection was carried out under the long-term cooling condition of IVR under the condition of water and real core melt. By weighted integration of the area under the local boundary, the heat transfer of the lower boundary is obtained. The results show that Nu numerical calculation of the upper and lower boundary of the number of fluid with the BALI test and ACOPO heat transfer correlation calculated values in good agreement. The calculated results of the real melt indicate that the decrease of Pr will significantly reduce the heat transfer from the molten pool to the upper boundary, so as to reduce the thermal focusing effect on the sidewall of the metal layer and increase the thermal safety margin of IVR.