Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of  Open Natural Circulation System

Sun Yuxiang; Xu Jianjun; Zhou Huihui; Deng Zhiyong; Yuan Zhaofei; Cui Yinghuan; Huang Yanping

doi:10.13832/j.jnpe.2022.02.0065

Volume 43 Issue 2

Apr. 2022

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Article Navigation > Nuclear Power Engineering > 2022 > 43(2): 65-69

Sun Yuxiang, Xu Jianjun, Zhou Huihui, Deng Zhiyong, Yuan Zhaofei, Cui Yinghuan, Huang Yanping. Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of Open Natural Circulation System[J]. Nuclear Power Engineering, 2022, 43(2): 65-69. doi: 10.13832/j.jnpe.2022.02.0065

Citation:

Sun Yuxiang, Xu Jianjun, Zhou Huihui, Deng Zhiyong, Yuan Zhaofei, Cui Yinghuan, Huang Yanping. Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of Open Natural Circulation System[J]. Nuclear Power Engineering, 2022, 43(2): 65-69. doi: 10.13832/j.jnpe.2022.02.0065

Citation:

Sun Yuxiang, Xu Jianjun, Zhou Huihui, Deng Zhiyong, Yuan Zhaofei, Cui Yinghuan, Huang Yanping. Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of Open Natural Circulation System[J]. Nuclear Power Engineering, 2022, 43(2): 65-69. doi: 10.13832/j.jnpe.2022.02.0065

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Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of Open Natural Circulation System

doi: 10.13832/j.jnpe.2022.02.0065

1.
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2021-01-19
Accepted Date: 2022-02-28
Rev Recd Date: 2021-03-04
Publish Date: 2022-04-02

Abstract

Abstract

As the ultimate heat sink discharge loop of the new passive residual heat removal system, the safe and stable operation of the open natural circulation system is very important for removing the residual heat of the reactor core under accident conditions. In this paper, the flow pattern evolution in the outlet heat removal pipe of the open natural circulation system is observed by visual experiment. It was found that with the increase of heating power, the open natural circulation is gradually established. There are five typical flow patterns in the heat removal pipe at the outlet of the system: single-phase flow, intermittent bubble flow, dispersed bubble flow, slug flow and intermittent jet flow. The relationship between the flow pattern in the outlet heat removal pipe and the stable operation of the system is analyzed, and the source of the violent oscillation of the open natural circulation system is found, which provides reference for improving the flow stability of the open natural circulation system.
- Open natural circulation,
- Two-phase flow pattern,
- Flow oscillation

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Study on Flow Pattern Evolution in Outlet Heat Removal Pipe of Open Natural Circulation System

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