Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor

Jing-Jing Li; Ya-Lan Qian; Jun-Lian Yin; Hua Li; Wei Liu; De-Zhong Wang

doi:10.1007/s41365-018-0411-3

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Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2021-02-07

- Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor
- Nuclear Science and Techniques Vol. 29, Issue 5, Article number: 62(2018)
- Affiliations：
  
  1.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  2.Shanghai Institute of Applied Physics, Shanghai 201800, China
- Author bio：
  
  Corresponding author, jlyin@sjtu.edu.cn
- Funds：
- DOI：10.1007/s41365-018-0411-3
  CLC：
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Jing-Jing Li, Ya-Lan Qian, Jun-Lian Yin, et al. Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor. [J]. Nuclear Science and Techniques 29(5):62(2018)
DOI：

Jing-Jing Li, Ya-Lan Qian, Jun-Lian Yin, et al. Large eddy simulation of unsteady flow in gas–liquid separator applied in thorium molten salt reactor. [J]. Nuclear Science and Techniques 29(5):62(2018) DOI： 10.1007/s41365-018-0411-3.

摘要

Abstract

Axial gas–liquid separators have been adopted in fission gas removal systems for the development of thorium molten salt reactors. In our previous study, we observed an unsteady flow phenomenon in which the flow pattern is directly dependent on the backpressure in a gas–liquid separator; however, the underlying flow mechanism is still unknown. In order to move a step further in clarifying how the flow pattern evolves with a variation in backpressure, a large eddy simulation (LES) was adopted to study the flow field evolution. In the simulation, an artificial boundary was applied at the separator outlet under the assumption that the backpressure increases linearly. The numerical results indicate that the unsteady flow feature is captured by the LES approach, and the flow transition is mainly due to the axial velocity profile redistribution induced by the backpressure variation. With the increase in backpressure, the axial velocity near the downstream orifice transits from negative to positive. This change in the axial velocity sign forces the unstable spiral vortex to become a stable rectilinear vortex.

关键词

Keywords

Swirl flowThorium molten salt reactorComputational fluid dynamicsLarge eddy simulation

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Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University

College of Nuclear Technology and Automation Engineering, Chengdu University of Technology

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Shanghai Institute of Applied Physics, Chinese Academy of Sciences

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