CFX-5.6을 이용한 원자로공동에서의 자연순환 이상유동해석

초록

This work presents a numerical analysis of two-phase natural circulation flow in reactor cavity under external vessel cooling using CFX-5.6. Unsteady, three-dimensional Reynolds-averaged Navier-Stokes equations for multiphase flows with zero equation turbulence model are solved to predict the shear key effect on the circulation rate of cooling water and the distribution of void fraction according to the different mass flow of inlet air. Results show that shear key has a little effect on the circulation rate of cooling water and induces a local increase of void fraction below the shear key, but not remarkably.