29th Symposium on Fusion Technology (SOFT 2016)

P2.117 Analytical comparison of mock-ups with swirl and smooth tube for KSTAR divertor

6 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 117

Poster F. Plasma Facing Components P2 Poster session

Speaker

Jaehyun Song (Advanced Engineering Division)

Description

The tungsten (W) brazed flat type mock-up with swirl tube which consists of W, OFHC-Cu (oxygen-free high conductive copper) and CuCrZr alloy has been designed for KSTAR divertor in preparation for KSTAR upgrade. The mock-ups are tested for several thousand thermal cycles with absorbed heat flux up to 8 MW/m²2 for 20 sec duration at KoHLT-EB in KAERI. In this paper, for comparison of two types of mock-ups with swirl and smooth, the hydraulic thermo-mechanical analysis is performed by using ANSYS WORKBENCH 16.0 and experimental results are compared with the Finite element analysis (FEA) prediction. FEA is performed to compare the cooling effect of the mock-ups with swirl and smooth tube and investigate the expected fatigue lifetime. To compare the cooling effect, the temperature profile of the mock-ups and the convective heat transfer coefficient of the coolant are analyzed varying the absorbed heat flux from 1 to 8 MW/m²2. To predict the fatigue lifetime of the mock-ups, the equivalent total strains calculated by the mechanical analysis are applied to the experimental fatigue curves for CuCrZr-IG. As a result, it is considered that in case of smooth tube, the local area in the water is in the subcooled boiling regime, and the cooling effect of mock-up with swirl tube is better than that with smooth tube.