Computational simulation of thermal hydraulic processes in the model LMFBR fuel assembly

International Conference for Young Scientists, Specialists, and Postgraduates on Nuclear Reactor Physics 2016

Bayaskhalanov, M.V.^1 ; Merinov, I.G.^1 ; Korsun, A.S.^1 ; Vlasov, M.N.^1

National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, Moscow, Russia^1

关键词: Anisotropic porous media;    Coefficients determination;    Computational simulation;    Coolant temperature;    Liquid metal coolants;    Numerical solution;    Partial blockage;    Thermal hydraulic process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/781/1/012049/pdf
DOI  :  10.1088/1742-6596/781/1/012049

来源: IOP

【 摘 要 】

The aim of this study was to verify a developed software module on the experimental fuel assembly with partial blockage of the flow section. The developed software module for simulation of thermal hydraulic processes in liquid metal coolant is based on theory of anisotropic porous media with specially developed integral turbulence model for coefficients determination. The finite element method is used for numerical solution. Experimental data for hexahedral assembly with electrically heated smooth cylindrical rods cooled by liquid sodium are considered. The results of calculation obtained with developed software module for a case of corner blockade are presented. The calculated distribution of coolant velocities showed the presence of the vortex flow behind the blockade. Features vortex region are in a good quantitative and qualitative agreement with experimental data. This demonstrates the efficiency of the hydrodynamic unit for developed software module. But obtained radial coolant temperature profiles differ significantly from the experimental in the vortex flow region. The possible reasons for this discrepancy were analyzed.