Numerical Calculation of the Peaking Factor of a Water-Cooled W/Cu Monoblock for a Divertor

HAN Le (韩乐); CHANG Haiping (常海萍); ZHANG Jingyang (张镜洋); XU Tiejun (许铁军)

doi:10.1088/1009-0630/17/9/14

Plasma Science and Technology > 2015 > 17(9): 802-808. > DOI: 10.1088/1009-0630/17/9/14

HAN Le (韩乐), CHANG Haiping (常海萍), ZHANG Jingyang (张镜洋), XU Tiejun (许铁军). Numerical Calculation of the Peaking Factor of a Water-Cooled W/Cu Monoblock for a Divertor[J]. Plasma Science and Technology, 2015, 17(9): 802-808. DOI: 10.1088/1009-0630/17/9/14

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Numerical Calculation of the Peaking Factor of a Water-Cooled W/Cu Monoblock for a Divertor

1College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by National Magnetic Confinement Fusion Science Program of China (No. 2010GB104005) and Funding of Jiangsu Innovation Program for Graduate Education, China (CXLX12 0170), the Fundamental Research Funds for the Central Universities of China

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Received Date: October 17, 2014

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Abstract

Abstract

In order to accurately predict the incident critical heat flux (ICHF, the heat flux at the heated surface when CHF occurs) of a water-cooled W/Cu monoblock for a divertor, the exact knowledge of its peaking factors (fp) under one-sided heating conditions with different design parameters is a key issue. In this paper, the heat conduction in the solid domain of a water-cooled W/Cu monoblock is calculated numerically by assuming the local heat transfer coefficients (HTC) of the cooling wall to be functions of the local wall temperature, so as to obtain fp. The reliability of the calculation method is validated by an experimental example result, with the maximum error of 2.1% only. The effects of geometric and flow parameters on the fp of a water-cooled W/Cu monoblock are investigated. Within the scope of this study, it is shown that the fp increases with increasing dimensionless W/Cu monoblock width and armour thickness (the shortest distance between the heated surface and Cu layer), and the maximum increases are 43.8% and 22.4% respectively. The dimensionless W/Cu monoblock height and Cu thickness have little effect on fp. The increase of Reynolds number and Jakob number causes the increase of fp, and the maximum increases are 6.8% and 9.6% respectively. Based on the calculated results, an empirical correlation on peaking factor is obtained via regression. These results provide a valuable reference for the thermal-hydraulic design of water-cooled divertors.
- divertor,
- water-cooled W/Cu monoblock,
- peaking factor,
- numerical calcula?tion,
- empirical correlation

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References (16)

References

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