원자로 외벽냉각시 원자로공동에서의 자연순환 이상유동에 대한 수치적 연구

초록

This work presents a numerical analysis of two-phase natural circulation flow in the reactor cavity under external vessel cooling. Steady, incompressible and three-dimensional Reynolds Navier-Stokes equations for multiphase flows with zero equation turbulence model are solved to predict the shearkey 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 shearkey has a positive effect on the circulation rate of cooling water and induce a local increase of void fraction below the shear key, but not remarkably.