Numerical Simulation Analysis for the Divertor Plate of DEMO Reactor

The hydraulic simulation and structure coupled analysis were used to explore critical heat flux (CHF) margin of the W (tungsten) armour and the accommodation of the thermal stress between the cooling tube and the W armour. The t (wall thickness of the F82H tube) variation or as a constant were considered to analysis the heat removal capability of the cooling tube. It was found a nonlinear distribution of the peak T (temperature) for the W armour and the top cooling tube with the tube bore rising. And an allowable heat flux with 5 MW/m or under the value would be acceptable based on present engineering consideration ( t=1mm, d=10mm and the coolant velocity=10m/s). The structure coupled analysis (d=10mm) indicated the primary stress of the cooling tube was safety, less than 50MPa, but thermal stress would be closed to 3Sm (F82H,550 ) due to the thermal expansion between W armour and F82H tube. Based on the coupled results, a thinner tube would be better than a thicker one by considering thermal conducting and thermal stress. Finally, for the issues on CHF and thermal stress, the possible optimizations were discussed involved the material choice, the structure of the cooling channel and the water condition .