Thermo-structural Analysis on First Walls Cooling Channel of DEMO Blanket Cooled by Supercritical Water

摘要

Design of the cooling channel of DEMO blanket is challenging and requires an effective heat transfer from first walls, to maintain the material integrity up to the maximum heat flux. This paper presents the thermo-mechanical performance of first walls with two different cooling schemes and different shapes and dimensions of cross section of cooling channel. In this study, a coupled code ANSYS CFX/SIMULATION is used to calculate the temperature and thermal stress distribution in structural material. ANSYS CFX serves as the computational fluid dynamics (CFD) tool and SIMULATION as the computational structural mechanics (CSM) tool. Supercritical water is selected as the coolant of blanket. The temperature and thermal stress distributions are analyzed. Based on two criteria, I.e. Maximum temperature and maximum stress, the thermo-mechanical performance is analyzed of first walls with two different cooling schemes and different shapes of cross section of cooling channel. The calculation shows that first walls of blankets are able to maintain its material integrity under both two different cooling schemes. And the influence that different shapes of cross section have on temperature and thermal stress distribution in first walls are found out.