Characteristics of Thermal–Hydraulic and Heat Transfer in Liquid Windowless Target of Accelerator Driven Subcritical

[+] Author and Article Information
Feng Wang

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems,
Ministry of Education,
Chongqing University,
Chongqing 400044, China
e-mail: wangfeng@cqu.edu.cn

Qiang Wen

College of Power Engineering,
Chongqing University,
Chongqing 400044, China
e-mail: 20151002041@cqu.edu.cn

Xue Qin

Nuclear Power Design and
Research Sub-Institute,
Chengdu 610041, Sichuan, China
e-mail: 969886547@qq.com

1Corresponding author.

Manuscript received August 28, 2017; final manuscript received January 14, 2018; published online May 16, 2018. Assoc. Editor: Leon Cizelj.

ASME J of Nuclear Rad Sci 4(3), 031021 (May 16, 2018) (5 pages) Paper No: NERS-17-1098; doi: 10.1115/1.4039034 History: Received August 28, 2017; Revised January 14, 2018

In recent years, the morphological characteristics and stabilization methods of free interface in liquid windowless target become hot research topics in accelerator driven subcritical system (ADS). Based on the structure design of a certain windowless spallation target, computational fluid dynamics (CFD) software of CFX was used to simulate and analyze its free interface character. The method of kε turbulence, cavitation, and volume of fluid (VOF) model was used to study the flow characteristic of liquid Lead-Bismuth eutectic (LBE) alloy with cavitation phase change and to analyze the free interface morphology characteristics of coolant in the target area. It is concluded that the target region forms two stable free interfaces when fluid outlet pressure is in the range of 10–40 kPa and fluid entrance velocity is in the range of 0.5–1.2 m/s. The flow field near the free interface structure is complex. The vortex region appears, and the disorders in the vortex flow pattern lead to fluctuation of the free interface. After the study of stable free interface morphology establishing process, heat transfer characteristic of windowless target was further analyzed.

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Fig. 1

Structure and grids of windowless target

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Fig. 2

Free interface morphology under different inlet velocities (light: LBE liquid; deep: LBE vapor)

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Fig. 3

Free interface morphology and velocity field (light: LBE liquid; deep: LBE vapor)

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Fig. 4

Coolant outlet pressure effects on free interface form (light: LBE liquid; deep: LBE vapor)

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Fig. 5

Phase distribution within the windowless target at different time (light: LBE liquid; deep: LBE vapor)

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Fig. 6

The flow-field distribution in the windowless target after reaching stable state

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Fig. 7

Flow-field distribution comparison with experiment

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Fig. 8

Energy deposition within the windowless target region (left) and window target region (right)

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Fig. 9

Temperature distribution in the windowless target at the different time after heat deposition



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