JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.7 P.508-516

Performance of a precooled 4 K Stirling type high frequency pulse tube cryocooler with Gd₂O₂S*

Author(s): Zhuo-pei Li¹, Yan-long Jiang¹, Zhi-hua Gan², Li-min Qiu², Jie Chen³
Affiliation(s): 1. Man-machine Environment Engineering, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; more
Corresponding email(s): peggy_goodluck@nuaa.edu.cn
Key Words: Stirling type pulse tube cryocooler (SPTC), 4 K, Regenerator material, Regenerator loss, High frequency, Precool, Cold inertance tube

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Zhuo-pei Li, Yan-long Jiang, Zhi-hua Gan, Li-min Qiu, Jie Chen. Performance of a precooled 4 K Stirling type high frequency pulse tube cryocooler with Gd₂O₂S[J]. Journal of Zhejiang University Science A, 2014, 15(7): 508-516.

@article{title="Performance of a precooled 4 K Stirling type high frequency pulse tube cryocooler with Gd₂O₂S",
author="Zhuo-pei Li, Yan-long Jiang, Zhi-hua Gan, Li-min Qiu, Jie Chen",
journal="Journal of Zhejiang University Science A",
volume="15",
number="7",
pages="508-516",
year="2014",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1400052"
}

%0 Journal Article
%T Performance of a precooled 4 K Stirling type high frequency pulse tube cryocooler with Gd₂O₂S
%A Zhuo-pei Li
%A Yan-long Jiang
%A Zhi-hua Gan
%A Li-min Qiu
%A Jie Chen
%J Journal of Zhejiang University SCIENCE A
%V 15
%N 7
%P 508-516
%@ 1673-565X
%D 2014
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1400052

TY - JOUR
T1 - Performance of a precooled 4 K Stirling type high frequency pulse tube cryocooler with Gd₂O₂S
A1 - Zhuo-pei Li
A1 - Yan-long Jiang
A1 - Zhi-hua Gan
A1 - Li-min Qiu
A1 - Jie Chen
J0 - Journal of Zhejiang University Science A
VL - 15
IS - 7
SP - 508
EP - 516
%@ 1673-565X
Y1 - 2014
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1400052

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: The efficiency of 4 K Stirling type pulse tube cryocoolers (SPTCs) is rather low due to significant regenerator losses associated with the unique properties of helium around 4 K and the high operating frequencies. In this paper, regenerator performance at liquid helium temperature regions under high frequencies is investigated based on a single-stage SPTC precooled by a two-stage Gifford-McMahon type pulse tube cryocooler (GMPTC). The 4 K SPTC used a 10 K cold inertance tube as phase shifters for better phase relationship between pressure and mass flow. The effect of the operating parameters, including frequency and average pressure on the performance of the 4 K SPTC, was investigated and the first and second precooling powers provided by the GMPTC were obtained. To reduce the regenerator heat transfer losses, a multi-layer regenerator matrix, including Gd₂O₂S (GOS) and HoCu₂, was used instead of a single-layer HoCu₂ around 4 K. A theoretical and experimental comparison between the two types of regenerator materials was made and the precooling requirements for a regenerator operating at high frequencies to reach liquid helium temperatures were given, which provided guidance for the design of a three-stage SPTC.

采用Gd2O2S回热填料的带预冷4K斯特林型高频脉管制冷机性能研究

研究目的：研究新型磁性回热填料Gd2O2S对液氦温区高频脉管制冷机多级回热器损失特性的影响。
创新要点：确定了不同回热填料以及运行参数（频率、平均压力）下液氦温区多级脉管制冷机的制冷温度和各级预冷量，进一步明确了4K高频回热损失机理。
研究方法：采用理论研究与实验验证相结合的方法，基于一台两级G-M型低频脉管制冷机预冷的单极斯特林型高频脉管制冷机，研究多级回热器在高频以及4K温区下的损失特性。选取新型回热填料Gd2O2S替代部分回热填料HoCu2，比较回热器采用两种填料时在不同运行频率及平均压力下的冷端制冷温度（图10）、各级预冷量和预冷温度（图11-12）。
重要结论：采用孔隙率较小的新型磁性回热填料Gd2O2S可显著改善第一级回热器内压力波与质量流的相位关系，从而减小该级回热损失。减小平均压力可以降低制冷机无负荷制冷温度并减小第二级预冷量，但制冷工质氦的体积比热容会急剧增大，从而使低温级回热器的换热对频率非常敏感。此外，频率对高温级回热器的回热特性影响不明显。该方法可以为三级斯特林型4K多级脉管制冷机提供设计依据。

关键词：斯特林型脉管制冷机；回热填料；4K；高频；预冷；低温惯性管

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采用Gd2O2S回热填料的带预冷4K斯特林型高频脉管制冷机性能研究

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