Numerical analysis of local flow and heat transfer of FCC domain in pebble bed reactor

Qiang YAO; Xueyan GUO; Fan YANG; Zhiyuan WANG

doi:10.11949/0438-1157.20190622

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Numerical analysis of local flow and heat transfer of FCC domain in pebble bed reactor

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Numerical analysis of local flow and heat transfer of FCC domain in pebble bed reactor
- CIESC Journal Vol. 70, Issue S2, Pages: 161-168(2019)
- 作者机构：
  
  上海理工大学能源与动力工程学院，上海 200093
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190622
  CLC： TK 11⁺2
- Received：04 June 2019，
  
  Revised：2019-07-10，
  
  Published：05 September 2019
- 稿件说明：
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姚强, 郭雪岩, 杨帆, 王志远. 球床反应堆面心立方单元局部流动与传热的数值分析[J]. 化工学报, 2019, 70(S2): 161-168

YAO Qiang, GUO Xueyan, YANG Fan, WANG Zhiyuan. Numerical analysis of local flow and heat transfer of FCC domain in pebble bed reactor[J]. CIESC Journal, 2019, 70(S2): 161-168
姚强, 郭雪岩, 杨帆, 王志远. 球床反应堆面心立方单元局部流动与传热的数值分析[J]. 化工学报, 2019, 70(S2): 161-168 DOI： 10.11949/0438-1157.20190622.

YAO Qiang, GUO Xueyan, YANG Fan, WANG Zhiyuan. Numerical analysis of local flow and heat transfer of FCC domain in pebble bed reactor[J]. CIESC Journal, 2019, 70(S2): 161-168 DOI： 10.11949/0438-1157.20190622.

摘要

球床反应堆燃料球表面局部热点的存在影响到反应堆的安全，其形成与燃料球尺度的冷却剂局部流动密切相关。为保证计算结果的准确性和物理真实性，采用大涡模拟(LES)方法和全结构网格对面心立方(FCC)单元面接触排列方式的局部流动和传热进行了数值分析。研究分析了非定常流动的特点及其对对流换热的影响。燃料球表面的时均温度分布表明燃料球表面存在稳定的热点或热斑，也发现瞬时温度波动较大，存在明显高于时均值的瞬时热点。

Abstract

The existence of hot spots on the surface of pebbles in pebble reactors affects the safety of the reactor and its formation is closely related to the local flow of coolant at the pebble scale. In order to ensure the accuracy and physical reality of the solution

the large eddy simulation (LES) method and the fully structured grid are applied to conduct the numerical analysis of the local flow and heat transfer of the face-centered cubic (FCC) unit in the area contact arrangement mode. The characteristics of unsteady flow and its effect on convective heat transfer are analyzed. The time-averaged temperature distribution indicates that there are stable hot spots on the surface of pebbles

and it is also found that the instantaneous temperature fluctuation on the surface of pebble is large

and there are also instantaneous hot spots where the temperature is significantly higher than the time-averaged temperature.

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references

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