Effects of DC flow on pulse tube cryocooler working at liquid hydrogen and liquid nitrogen temperatures
Effects of DC flow on pulse tube cryocooler working at liquid hydrogen and liquid nitrogen temperatures
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液氢、液氮温度下直流电流对脉冲管制冷机的影响
DOI：
10.1016/j.applthermaleng.2018.03.107
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
Limin Qiu
中科院分区：
文献类型：
--
作者：
Chen Huang;Qiang Cao;Xiaoqin Zhi;Xi Xia;Limin Qiu
直流气流（DC flow）过去被认为是脉管制冷机（PTC）的一种损耗，但近年来研究发现，直流气流对低温PTC的制冷性能有很大的改善作用。但是，它为什么能提高冷却性能的原因仍然不够清楚。为了独立揭示直流流的工作机理，对一台不带双进气阀的两级斯特林型PTC进行了仿真分析和实验验证。结果表明，在20 K附近工作的第二级PTC中，通过从回热器侧向脉冲管侧引入正向直流气流，脉冲管内交流焓流显著增加，回热器内交流焓流显著降低，从而改善了PTC的冷却性能。这是因为在正DC流的帮助下，改善了20 K PTC的脉冲管和回热器中的温度梯度，即DC流在其中引起较小的热损失。然而，在80 K附近工作的PTC的直流流动对改善其冷却性能没有帮助。模拟结果与实验结果一致，优化后的直流流量使第二级斯特林PTC的空载制冷温度下降了6-7 K，22 K时的制冷量增加了约1 W。
The direct current gas flow (DC flow), normally treated as a loss in the pulse tube cryocoolers (PTCs) in the past, has been found may be beneficial to the cooling performance of the PTC working at low temperatures recently. However, the reason why it can improve the cooling performance is still not clear enough. In order to reveal the working mechanism of the DC flow independently, simulation analysis and experiment verification are carried out on a two-stage Stirling type PTC without the double-inlet valve. Results indicate that in the second stage PTC working around 20 K, by introducing the DC flow with a positive direction from regenerator side to pulse tube side, the cooling performance will be improved due to the remarkable increase of the AC enthalpy flow in the pulse tube and the decrease of AC enthalpy flow in the regenerator. This is because with the help of positive DC flow, the temperature gradients in the pulse tube and the regenerator of the 20 K PTC are improved, i.e. the DC flow causes smaller heat losses in them. Nevertheless, the DC flow has no help on improving the cooling performance of the PTC working around 80 K. Simulation and experiment show consistency that with an optimized DC flow, the no-load refrigeration temperature of the second stage Stirling PTC drops 6–7 K, and the cooling capacity at 22 K increases about 1 W.
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Gedeon 流对双入口脉冲管制冷机效率的影响
影响因子：
6.4
作者：
Tang Ke;Feng Ye;Jin Tao;Jin Shenghan;Yang Rui
通讯作者：
Yang Rui
DOI：
10.1063/1.1472117
发表时间：
2002-05
期刊：
Advances in cryogenic engineering
影响因子：
--
作者：
R. Radebaugh;A. O'Gallagher;J. Gary
通讯作者：
R. Radebaugh;A. O'Gallagher;J. Gary
影响因子：
2.1
作者：
C. Wang;G. Thummes;C. Heiden
通讯作者：
C. Wang;G. Thummes;C. Heiden
影响因子：
2.1
作者：
Guo-bang Chen;L. Qiu;Jinyang Zheng;P. Yan;Z. Gan;X. Bai;Zhixiu Huang
通讯作者：
Guo-bang Chen;L. Qiu;Jinyang Zheng;P. Yan;Z. Gan;X. Bai;Zhixiu Huang
影响因子：
2.1
作者：
L. Qiu;Z. Xiaoqin;L. Han;Q. Cao;Z. Gan
通讯作者：
L. Qiu;Z. Xiaoqin;L. Han;Q. Cao;Z. Gan