Chen, Yuming

Cho, Hyung Hee

Ghidersa, Bradut-Eugen

Lee, Namkyu

Lim, Joon-Soo

Reiser, Jens

English

KITopen

KIT – The Research University in the Helmholtz AssociationCFD Analysis of the He-cooled mock-upHelium-cooled Divertor: Design and DEMO Integration StudiesBradut-Eugen Ghidersa1, Jens Reiser1, Yuming Chen1, Joon-Soo Lim2, Namkyu Lee2, Hyung Hee Cho21Karlsruhe Institute of Technology (KIT), Institute for Neutron Physics and Reactor Technology (INR), Karlsruhe, Germany2Heat Transfer Lab. Dep. of Mechanical Engineering, Yonsei University, Republic of KoreaThis work has been partially carried out within the framework of the EUROfusion Consortium and has received funding from the Euratomresearch and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.KIT Helium-Cooled Divertor• High temperature solution: THe > 500°C• Designed for 10MW/m² peak heat flux• Uses tungsten laminates as structural material• Simple geometry: W-blocks (armour) installed on a W-laminate pipe (similar to ITER divertor)• Jet-impingement cooling: Helium flow is distributed through a inner manifold along the W-laminate pipe Summary and Conclusions:• Evaluation of the thermal-hydraulic performances of the new helium-cooled divertor concept• Proposal of a target integration concept using 5 modules in series as well as an experimental plan for the validation and qualification of the concept• Manufacturing of 1 divertor module mock-up and evaluation of the thermal performance via CFD• W-laminate pipe max. temperature around 1070°C• It is possible to decrease further this value through heat transfer enhancement techniques, for instance , ribs on the pipe inner surface• CFD of 2 modules in series with concentrated heat flux• Higher temperature values in the solid parts (pipe) than for the mock-up• Jet tilting (~60°) could account for 20% HTC reduction• Further optimization for a better flow distribution and reduced jet tilting is needed• Experiments planned for 2018 will look into evaluating experimentally the new concept performance and validate the numerical modelsTemperature fieldW-laminate surface temperatureCooling performance enhancement: pipe with ribsPipe max. temperature: 920°CImpingement jet pattern for the reference case (bottom) and a configuration using inner ribs (top)He-cooled Divertor mock-upTemperature fieldW-laminate surface temperatureTarget integration studies• The length of the DEMO outboard vertical target is 645mm; applying the jet cooling scheme for the full length (1 module) would require ~1kg/s per row: • large pressure losses • non-uniform jet-flow rates distribution• Low coolant temperature increase (~7°C)• Most of the target length see loads around 1MW/m²• Only near the strike point the surface heat load is large• Use a cooling scheme with several segments in series:• Lower flow rate needed (~65g/s per row)• Better jet flow rate distribution• Higher coolant temperature increase (~100°C)Armour: W-blockW-laminate pipeCoolant distribution manifold 10MW/m²Jet velocity under the high heat flux areaP1-017

Helium cooled divertor: Design and DEMO integration studies

https://publikationen.bibliothek.kit.edu/1000076472/4822574

Helium cooled divertor: Design and DEMO integration studies

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