期刊
FUSION ENGINEERING AND DESIGN
卷 121, 期 -, 页码 211-217出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2017.07.014
关键词
Plasma facing components; Monoblock; CFC; High heat flux
资金
- U.S. Department of Energy, Office of Science, Office of Fusion Energy Science [DE-AC05-000R22725]
- Federal Ministry of Education and Research of the Federal Republic of Germany [03FUS0014A]
Long-pulse operation of the Wendelstein 7-X (W7-X) stellarator experiment is scheduled to begin in 2020. During this operational phase the vessel will be equipped with water-cooled plasma facing components to allow for longer pulse durations. Certain simulated plasma scenarios have been shown to produce heat fluxes that could surpass the technological limits of the divertor target elements during steadystate operation. To reduce the heat load on the target elements, the addition of a scraper element (SE) is under investigation. The SE is composed of 24 water-cooled carbon fiber reinforced carbon composite monoblock units. Multiple full-scale prototypes have been tested in the GLAD'S high heat flux test facility. Previous computational studies revealed discrepancies between the simulations and experimental measurements. In this work, single-phase thermal-hydraulics modeling was performed in ANSYS CFX to identify potential causes for such discrepancies. Possible explanations investigated were the effects of a non-uniform thermal contact resistance and a potential misalignment of the monoblock fibers. While the difference between the experimental and computational results was not resolved by a non-uniform thermal contact resistance, the computational results provided insight into the potential performance of a W7-X monoblock unit. Circumferential temperature distributions highlighted the expected boiling regions of such a unit. Furthermore, simulations revealed that modest angles of fiber misalignment in the monoblocks result in asymmetries at the unit edges and provide temperature differences similar to the experimental results. (C) 2017 Elsevier B.V. All rights reserved.
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