CIESC Journal ›› 2019, Vol. 70 ›› Issue (S2): 161-168.DOI: 10.11949/0438-1157.20190622

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

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

Qiang YAO(),Xueyan GUO(),Fan YANG,Zhiyuan WANG   

  1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2019-06-04 Revised:2019-07-10 Online:2019-09-06 Published:2019-09-06
  • Contact: Xueyan GUO

球床反应堆面心立方单元局部流动与传热的数值分析

姚强(),郭雪岩(),杨帆,王志远   

  1. 上海理工大学能源与动力工程学院,上海 200093
  • 通讯作者: 郭雪岩
  • 作者简介:姚强(1990—),男,硕士研究生,yaoqiang_right@163.com
  • 基金资助:
    国家自然科学基金项目(51176127)

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.

Key words: fixed-bed, convection, face-centered cubic, LES, structured grid, area contact, numerical analysis

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。

关键词: 固定床, 对流, 面心立方, 大涡模拟, 结构网格, 面接触, 数值分析

CLC Number: