Experimental investigation and CFD simulation of reflooding in narrow rectangle channel

Jianye JI; Wei XU; Xiang CHAI; Xiaojing LIU; Wei ZENG

doi:10.11889/j.0253-3219.2017.hjs.40.010601

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Experimental investigation and CFD simulation of reflooding in narrow rectangle channel

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Experimental investigation and CFD simulation of reflooding in narrow rectangle channel
- NUCLEAR TECHNIQUES Vol. 40, Issue 1, Article number: 010601(2017)
- 作者机构：
  
  1.上海交通大学上海 200240
  2.中国核动力研究设计院成都 610041
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2017.hjs.40.010601
  CLC： TL3
- Received：01 November 2016，
  
  Revised：28 November 2016，
  
  Published：2017-01
- 稿件说明：
移动端阅览
Jianye JI, Wei XU, Xiang CHAI, et al. Experimental investigation and CFD simulation of reflooding in narrow rectangle channel[J]. Nuclear techniques, 2017, 40(1): 010601
DOI：

Jianye JI, Wei XU, Xiang CHAI, et al. Experimental investigation and CFD simulation of reflooding in narrow rectangle channel[J]. Nuclear techniques, 2017, 40(1): 010601 DOI： 10.11889/j.0253-3219.2017.hjs.40.010601.

摘要

在反应堆发生大破口事故时，再淹没阶段可以有效地降低燃料元件温度，防止堆芯熔毁。为了预测再淹没过程中板状燃料元件的换热特性，进行了竖直矩形窄缝通道底部再淹没过程的实验研究。针对实验工况，基于商用软件CFX，通过耦合分析加热板和流体的方法研究竖直矩形窄缝通道底部再淹没过程。通过将数值模拟结果与实验结果进行对比，评价了相关模型的适用性，并验证了计算流体动力学（Computational Fluid Dynamics，CFD）方法在预测再淹没过程的有效性。基于验证后计算模型，对壁面初始温度、入口流速对再淹没过程的影响进行了分析，获得了相关初始条件对壁面温度变化的影响规律。

Abstract

Background:

Reflooding phenomenon plays an important role in nuclear reactor accident. During reflooding phase

the water level will rise from the bottom to the top with quenching the hot fuel rods

which is the most important phase to guarantee the integrity of cladding.

Purpose:

The aim is to predict the heat transfer in reflooding phenomenon and to investigate the initial conditions effect on the temperature variance.

Methods:

The experiments and numerical method were carried out to obtain the temperature variance. The THERMAL facility was built and the computational fluid dynamics (CFD) software CFX was used during the study.

Results:

The experiment data shows that the wall initial temperature has a big influence on the quench velocity and rewet temperature. After the comparison with the numerical simulation

the numerical model was validated. Through the numerical simulation

the relationship between inlet velocity and wall temperature was received.

Conclusion:

It can be concluded that the CFD method can be used to predict the heat transfer in reflooding phenomenon. And some of the heat transfer models need to be improved to improve the accuracy.

关键词

Keywords

references

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