Abou-Sena, Ali

Arbeiter, Frederik

Kulenovic, Rudi

Neuberger, Heiko

Peet, Mathew

Schwab, Florian

von der Weth, Axel

English

Weth, Axel von der

KITopen

KIT – The Research University in the Helmholtz Association9%-Cr steels thermal conductivityThermal conductivity  directly influences thermal stressesIt varies from 20-33 W/m/K @500°C in the family of 9%Cr steelsTwo measurements for Eurofer differ by 5% @ 500°CThe neural network tool "Thermal10" (calibrated with 9%Cr steeldatabase) predicts +/-2% for Eurofer within alloy tolerancesValidation and verificationThe analytical thermohydraulic model ("SimFW v2" VBA) isvalidated vs. HETRA experimental data and compared to CFDGood conformity of ∆ vs. HETRA experiment (+/-4%)Overestimation of heat transferof 0-5% by analytical "SimFW" vs. HETRAof 8-12% by k- CFD model @y+=20  (CFX) vs. HETRABackground and ObjectiveThe First Wall has to withstand the thermal and erosive loads (radiation, neutrons and particles) originating from the plasma, and at the same time contribute to the balance of plant by delivering  high temperature heat  and consume only limited pumping power.At the example of a helium cooled First Wall with smooth channels loaded with average heat loads, the impact of tolerances from manufacturing and materials is studied.Institute for Neutron Physics and Reactor TechnologyContact: Dr.-Ing. Frederik Arbeiter <f.arbe@kit.edu>Sensitivity of First Wall thermal-mechanical performance on cooling channel geometry and thermal conductivityF. Arbeiter1, A. Abou-Sena1, R. Kulenovic2, H. Neuberger1, M. Peet3, F. Schwab1, A. von der Weth1FW slab (5 channels) measures and variated parametersIn Short: (1) A model for FW thermohydraulics was validated (2) Thermal conductivities in RAFM steels vary by +/-20% and impact on stresses.(3) Channel dimension variations impact strongly on massflow, but less on HTC distribution.1 Karlsruhe Institute of Technology, Eggenstein‐Leopoldshafen, Germany2 University of Stuttgart, Institute of Nuclear Technology and Energy Systems, Stuttgart, Germany3 University of Cambridge, Department of Materials Science and Metallurgy, Cambridge, United KingdomSimulation methodologyA first wall segment with 5 channels is simulated. The dimensionsand relative position of the central channel are variated (param. ei)1.) The mass flow rate through each channel is calculated with a hydraulic network model2.) Based on the individial mass flow rate, local heat transfercoefficients and pressures are computed3.) The temperature field is simulated with ANSYS (static thermal)4.) The stress field is simulated with ANSYS (static mechanical)Selected resultsVariation of channel width&height (e1=e2)Variation of thermal conductivityValidation/verifiication of thermal-hydraulic tool "SimFW v2"variatedchannelComparison of9% Cr steelstherm. cond. ,New ownmeasurementsfor Eurofer and P92Channel sizevariation impactsstrongy on mass flowrate distribution, but much less on heattransfer coefficient.In trhe expactedrange, 10% lessthermal conductivityresults in 12% highersecondary stresses(at 300kW/m² - linear scaling with heat fluxexpected)

Sensitivity of First Wall thermal-mechanical performance on cooling channel geometry and thermal conductivity

https://publikationen.bibliothek.kit.edu/1000081757/17729549

Sensitivity of First Wall thermal-mechanical performance on cooling channel geometry and thermal conductivity

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