圆柱容器内生成单粒径颗粒堆积的两阶段重力落球算法

刘峰瑞; 黄建平; 黎忠; 王纳秀

doi:10.11889/j.0253-3219.2017.hjs.40.020601

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圆柱容器内生成单粒径颗粒堆积的两阶段重力落球算法

核能科学与工程 | 更新时间：2021-05-19

- 圆柱容器内生成单粒径颗粒堆积的两阶段重力落球算法
- A mono-sized sphere packing algorithm in cylindrical container with two-phase gravity-based method
- 核技术 2017年40卷第2期文章编号：020601
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "刘峰瑞, 男, 1987年出生, 2011年毕业于兰州大学, 现为博士研究生, 研究领域为反应堆热工水力", "LIU Fengrui, male, born in1987, graduated from Lanzhou University in 2011, doctoral student, focusing on reactor thermal hydraulics" ]
  王纳秀, E-mail:wangnaxiu@sinap.ac.cn WANG Naxiu, E-mail:wangnaxiu@sinap.ac.cn
- 基金信息：
- DOI：10.11889/j.0253-3219.2017.hjs.40.020601
  中图分类号： TL339
- 收稿日期：2016-09-26，
  
  修回日期：2016-11-29，
  
  纸质出版日期：2017-02-10
- 稿件说明：
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刘峰瑞, 黄建平, 黎忠, 等. 圆柱容器内生成单粒径颗粒堆积的两阶段重力落球算法[J]. 核技术, 2017,40(2):020601

Fengrui LIU, Jianping HUANG, Zhong LI, et al. A mono-sized sphere packing algorithm in cylindrical container with two-phase gravity-based method[J]. Nuclear techniques, 2017, 40(2): 020601
刘峰瑞, 黄建平, 黎忠, 等. 圆柱容器内生成单粒径颗粒堆积的两阶段重力落球算法[J]. 核技术, 2017,40(2):020601 DOI： 10.11889/j.0253-3219.2017.hjs.40.020601.

Fengrui LIU, Jianping HUANG, Zhong LI, et al. A mono-sized sphere packing algorithm in cylindrical container with two-phase gravity-based method[J]. Nuclear techniques, 2017, 40(2): 020601 DOI： 10.11889/j.0253-3219.2017.hjs.40.020601.

摘要

球床型氟盐冷却高温堆（Pebble-bed Fluoride-salt-cooled High-temperature Reactor，PB-FHR）是下一代核反应堆堆型之一，它融合了高温气冷堆的石墨基质包覆颗粒燃料球技术和熔盐堆的高温熔盐冷却剂技术。堆芯热工水力模拟计算（如在线换料模拟）常需要首先得到不同孔隙率的随机燃料球堆积。为此提出了一种可以高效地在圆柱形容器内部随机生成单一粒径且不同密实度的颗粒堆积的算法。算法分为两个阶段：首先类似传统颗粒自由下落方法来生成柔性颗粒的初始堆积（取颗粒杨氏模量远小于实际值）；其次令初始堆积恢复刚性，通过限定时间步的大小和引入能量耗散机制使得堆积缓慢而自由地膨胀，从而逐渐消除初始堆积中的颗粒间重合。模拟结果表明，膨胀算法在计算效率上有较大优势，并且可以覆盖从松散到密实的堆积范围。通过控制自由下落阶段的杨氏模量、摩擦系数、缓慢膨胀阶段的摩擦系数这三个变量来控制堆积的孔隙率和计算效率。

Abstract

Background

The Pebble-bed Fluoride-salt-cooled High-temperature Reactor (PB-FHR) is one type of next generation IV nuclear power plants. It combines two existing technologies to create a new reactor option:graphite-matrix

coated-particle fuels developed for helium-cooled high-temperature reactors and liquid-fluoride-salt coolant used in molten salt reactors. To proceed thermal-hydraulic analysis of the core of PB-FHR such as online refuelling

randomly packed bed with different porosity is usually required firstly.

Purpose

In this study

an efficient algorithm to produce randomly packed pebble bed with mono-sized spheres and variable packing factor in cylindrical containers is proposed.

Methods

The packing of the pebble bed is initially constructed by free falling of soft particles (Young's module much less than the real value) under the gravity environment using the discrete element method (DEM). During the free-falling process

different Young's modules and friction factors are used to control the overlaps of the packing. Then the packing expands with specific large Young's module and friction factor to eliminate the unrealistic large overlaps. In the expanding process

the time step is limited and the strategy of dissipating elastic energy is introduced to constrain the speed of expansion.

Results

Low friction factor in two processes tends to produce the dense packing or vice versa. The computational burden depends on the Young's module in the free-falling process significantly.

Conclusion

Through adjusting the friction factor and the Young's module in the free-falling process and the friction factor in the expansion process

the packing algorithm can generate the pebble bed with wide range of porosity and higher computational efficiency.

关键词

Keywords

references

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