HCCB-TBM包层Li4SiO4球床堆积结构的数值模拟

doi:10.16568/j.0254-6086.201702008

核聚变与等离子体物理 ›› 2017, Vol. 37 ›› Issue (2): 173-180.DOI: 10.16568/j.0254-6086.201702008

HCCB-TBM包层Li4SiO4球床堆积结构的数值模拟

巩保平，冯勇进，刘洋，廖洪彬，王晓宇，冯开明

(核工业西南物理研究院，成都 610041)

收稿日期:2016-03-02 修回日期:2016-11-08 出版日期:2017-06-15 发布日期:2017-06-14
作者简介:巩保平(1990–)，男，甘肃天水人，硕士，主要从事固态包层中球床热机械性能的研究。
基金资助:
国家磁约束核聚变能发展研究专项(2013GB108001，2014GB111001)

Numerical modeling packing structures of Li4SiO4 pebble bed for HCCB-TBM

GONG Bao-ping, FENG Yong-jin, LIU Yang, LIAO Hong-bing, WANG Xiao-yu, FENG Kai-ming

(Southwestern Institute of Physics, Chengdu 610041)

Received:2016-03-02 Revised:2016-11-08 Online:2017-06-15 Published:2017-06-14

摘要/Abstract

摘要：

通过离散元法初步模拟了微球在重力作用下的堆积行为，并分析了氚增殖区Li₄SiO₄球床的局部堆积结构。研究结果表明，摩擦系数和恢复系数对球床最终堆积结构有很大的影响。当摩擦系数较小时，摩擦系数对球床堆积结构的影响起主要作用；当摩擦系数较大时，恢复系数对球床堆积结构的影响起主要作用。球形颗粒从靠近壁面处的规则分布逐渐过渡到内部区域的均匀随机分布。球床局部堆积因子表现出了明显的壁面效应，其分布随着微球到壁面距离的增加而呈现出振幅逐渐减小的振荡趋势。所得到的球床堆积结构信息可用于研究球床传热特性和提氚气体流动特性的随机堆积球床模型的建立。

关键词: 氚增殖包层, 堆积因子, 堆积结构, 离散元方法

Abstract:

The packing structures of pebble bed under the influence of gravity were studied initially by discrete element method simulation. The results indicate that both the friction coefficient and the restitution coefficient have a great influence on the final packing structure of pebble bed. When the friction coefficient is small, the effects of friction coefficient on the packing structure of pebble bed play a major role. When the friction coefficient is larger, the impacts of restitution coefficient on the packing structure of pebble bed play an important role. There is a transition of pebbles distribution from the regular distribution close to the container walls to the uniformly random distribution in the interior region of the pebble bed. The local packing factor of pebble bed shows an oscillation profile. The amplitude of the oscillation reduces gradually with the increase of distance to the container wall. The distribution of local packing factor presents a wall effect obviously. The packing structures of pebble beds obtained in this work can be used to build a random packing model of pebble bed for the studies of thermal properties of pebble bed and the flow characteristics of purge gas.

Key words: Tritium breeder blanket, Packing factor, Packing structure, Discrete element method

中图分类号:

TL62+7

巩保平，冯勇进，刘洋，廖洪彬，王晓宇，冯开明. HCCB-TBM包层Li4SiO4球床堆积结构的数值模拟[J]. 核聚变与等离子体物理, 2017, 37(2): 173-180.

GONG Bao-ping, FENG Yong-jin, LIU Yang, LIAO Hong-bing, WANG Xiao-yu, FENG Kai-ming. Numerical modeling packing structures of Li4SiO4 pebble bed for HCCB-TBM[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2017, 37(2): 173-180.

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HCCB-TBM包层Li4SiO4球床堆积结构的数值模拟

Numerical modeling packing structures of Li4SiO4 pebble bed for HCCB-TBM

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