微型斯特林制冷机回热器的分形表征

李仁智; 陈晓屏; 孙皓; 李昊岚

微型斯特林制冷机回热器的分形表征

昆明物理研究所，云南昆明 650223

详细信息

作者简介:
李仁智（1995-），男，云南曲靖人，硕士研究生，研究方向：小型低温制冷机。E-mail：lrzwkc@163.com

通讯作者:
孙皓（1979-），男，云南通海人，研高工，博士，主要从事小型低温制冷机研究。E-mail：652700@sina.com

中图分类号: TB651
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出版历程
- 收稿日期: 2021-02-23
- 修回日期: 2021-03-26
- 刊出日期: 2021-04-20

Fractal Characterization of Regenerator of Micro Stirling Coolers

Kunming Institute of Physics, Kunming 650223, China

摘要

摘要: 为研究回热器中填充结构的微观结构特征，基于多孔介质分形理论，使用压汞法对回热器孔隙分布情况及分形维数进行研究。回热器是微型斯特林制冷机的关键部件，使用不锈钢网片或不锈钢毡填充制备的回热器是一种典型的多孔介质。采用压汞法对回热器进行微观结构测试，得出回热器内部孔隙分布范围。结合多孔介质分形分析的基础理论，计算得出回热器分形维数，说明了回热器具有分形特征，得出回热器的分形维数区间。
- 斯特林制冷机 /
- 回热器 /
- 多孔介质 /
- 分形
Abstract: To investigate the microstructural characteristics of the filling structure in a regenerator, based on the fractal theory of porous media, the mercury intrusion method was used to study the pore distribution and fractal dimension of the regenerator. The regenerator is a key component of a miniature Stirling cooler. The regenerator prepared by filling stainless steel mesh or stainless steel felt is a typical porous medium. The microstructure of the regenerator was tested using the mercury intrusion method, and the pore distribution range inside the regenerator was obtained. Combined with the basic theory of fractal analysis of porous media, the fractal dimension of the regenerator is calculated, which shows that the regenerator has fractal characteristics, and the fractal dimension interval of the regenerator can be obtained.
- Stirling cooler /
- regenerator /
- porous media /
- fractal

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图 1 回热器网片

Figure 1. Mesh of regenerator

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图 2 不锈钢网片（左）和不锈钢毡（右）

Figure 2. Stainless steel mesh(left) & stainless steel felt(right)

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图 3 压汞仪

Figure 3. Mercury porosimeter

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图 4 压汞仪测试流程

Figure 4. Mercury porosimeter test process

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图 5 5个样品的孔隙体积-压力曲线

Figure 5. Volume vs. pressure of 5 samples

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图 6 样品体积-孔径分布情况

Figure 6. -dV/dlog(d) vs. pore size

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表 1 实验样品参数

Table 1. Sample parameters

Number	1#	4#	7#	10#	13#
mesh number	500	420	220	420	500
mass/g	3.53	2.64	2.15	2.27	3.53
Filling method	Manual	Manual	Manual	Manual	Mechanical

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表 2 样品孔隙率及分形维数

Table 2. Porosity & Df

Number	1#	4#	7#	10#	13#
Porosity	63.94%	69.41%	75.15%	72.44%	68.72%
Df	2.592	2.639	2.763	2.681	2.351

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