BALI试验的大涡模拟研究

Large Eddy Simulation for the BALI Experiment

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。

Using water and real core melts as work fluid,the turbulent natural convection due to internal heat generation of BALI experiment was studied by 2D large eddy simulation（LES）.Heat flow on 3D lower boundary was got by area-weighted integration of local heat flux on 2D lower boundary.The results show that The Nu number of water on upper and lower boundary from numerical simulation coincide well with that from BALI and ACOPO experiments.For the real core melts,Lower Pr number decrease the heat flow on upper boundary.Therefore,the thermal focus effect at side of metal layer is mitigated,and safety margin of IVR is increase.