He-cooled divertor development for DEMO

Norajitra, P.; Giniyatulin, R.; Ihli, T.; Janeschitz, G.; Krauß, W.; Kruessmann, R.; Кузнецов, В. Е.; Mazul, I.; Widak, V.; Ovchinnikov, I.; Ruprecht, R.; Zeep, B.

doi:10.1016/j.fusengdes.2007.05.027

Cited by 81 publications

(31 citation statements)

References 3 publications

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“…The development of a He-cooled divertor for a demonstration reactor (DEMO) is dependent on the reliable joining of refractory metals such as tungsten and reduced activation ferritic-martensitic steels such as EUROFER97 [1]. One of the joining technologies currently being developed is high temperature brazing [2,3].…”

Section: Introductionmentioning

confidence: 99%

The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

Hamilton¹,

Robbie²,

Wood³

et al. 2011

Fusion Engineering and Design

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This paper summarises the challenges in accurately predicting stress states in dissimilar brazed joints and presents initial results from a finite element analysis of a tungsten to EUROFER97 brazed joint. The residual stresses due to joint manufacture are presented and differences in stress distribution due to thermal and mechanical loading highlighted. The results from this analysis correlate well to experimental results from previous research however further validation is required. The challenges in developing fatigue assessment procedures for dissimilar brazed joints are also discussed. These fatigue assessment procedures are introduced and a validation strategy for such procedures is proposed

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Section: Introductionmentioning

confidence: 99%

The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

Hamilton¹,

Robbie²,

Wood³

et al. 2011

Fusion Engineering and Design

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“…This geometry was found as a result of previous studies [6], where base geometrical parameters (geometry of the tile and the thimble, the gap size, the number and arrangement of nozzles on the cartridge) were determined to accommodate for a heat flux of at least 10 (5/33) MW/m 2 . The heat transfer and flow characteristics of the reference design were also experimentally tested and numerically validated in an air flow loop under a wide range of…”

Section: Divertor Cooling Finger -Reference Design and Numerical Modelmentioning

confidence: 99%

“…The reference finger design denoted as J1-C [6] was used as a basis for parametric analyses of nozzle diameters variation. The plasma-facing side of the divertor (target plate)…”

Section: Divertor Cooling Finger -Reference Design and Numerical Modelmentioning

confidence: 99%

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Effect of nozzle sizes on jet impingement heat transfer in He-cooled divertor

Končar

Norajitra

Oblak

2010

Applied Thermal Engineering

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. Effect of nozzle sizes on jet impingement heat transfer in He-cooled divertor. Applied Thermal Engineering, Elsevier, 2009, 30 (6- This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT( ABSTRACTThe use of impinging jets for divertor cooling in the conceptual fusion power plant is attracting much attention due to its very high heat removal capability and moderate pumping power requirement. The latest and the most advanced divertor concept is based on modular design cooled by helium impinging jets. To reduce the thermal stresses, the plasma-facing side of the divertor is build up of numerous small cooling fingers cooled by an array of helium jets. In this study the influence of nozzle sizes on the heat transfer and flow characteristics of such cooling finger is investigated numerically. The main objective is to find an optimal size and distribution of nozzle diameters in the jet array in which the heat transfer would be the highest possible at an acceptable pressure drop through the cooling finger. Prior to nozzle diameters modification, the simulation results for the reference finger geometry were validated against high heat flux experiments. A good agreement was obtained. The nozzle diameters were then modified at two different mass flow rates (13.5 g/s and 6.8 g/s per cooling finger). The most critical design parameter of interest was the maximum thimble temperature, which is limited by the melting temperature of the filler material in the brazed finger joint. It has been found that an optimal jet arrangement should have equal nozzle diameters to reach the highest thimble temperature decrease, while keeping the pressure drop within reasonable limits.

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“…Tungsten has been proposed as potential armour material in high heat flux components such as the divertor in a future thermonuclear fusion demonstration reactor (DEMO) [1][2][3][4]. The divertor will undergo standard heat loads from 10MW/m 2 up to 20MW/m 2 during plasma instabilities [5].…”

Section: Introductionmentioning

confidence: 99%

Residual stress generation in tungsten-copper brazed joint using brazing alloy

Easton

Wood

Rahimi

et al. 2015

2015 IEEE 26th Symposium on Fusion Engineering (SOFE)

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This version is available at https://strathprints.strath.ac.uk/58219/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract-Understanding the residual stress state in brazed joints is crucial for operational design and life time performance of the part in service. High magnitude residual stresses are expected in the joined materials following cooling from brazing temperatures (≈950C) due to large mismatches in material properties such as coefficient of thermal expansion and Young's modulus (E). This paper aims to further understanding of the residual stresses caused when brazing tungsten to copper using a eutectic gold-copper brazing alloy. This configuration is potentially useful for future divertor designs. Finite Element Analysis (FEA) has been used to predict the brazing induced stresses and residual stress measurements were carried out on the brazed joint by X-ray diffraction (XRD) to validate the prediction model. Large residual stresses are predicted and measured in the tungsten; however there is disagreement in the nature of the stress. Predicted stresses are highly tensile in nature close to the brazing interface, whereas the measured stresses are highly compressive. The disagreement is believed to be caused by the model not accurately simulating the complex brazing process. Residual stress measurements on the copper were not possible due to texturing during brazing, grain growth and significant inelastic strains. Misalignment of parent materials was also observed to significantly affect residual stresses.

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He-cooled divertor development for DEMO

Cited by 81 publications

References 3 publications

The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

The challenges in predicting the fatigue life of dissimilar brazed joints and initial finite element results for a tungsten to EUROFER97 steel brazed joint

Effect of nozzle sizes on jet impingement heat transfer in He-cooled divertor

Residual stress generation in tungsten-copper brazed joint using brazing alloy

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