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Investigation on Precooling Effects of 4 K stirling-type Pulse Tube Cryocoolers

Journal of Thermal Science 2019年第4期28卷 714-726页

作者： CAO Qiang LI Zimu LUAN Mingkai SUN Zheng TANG Xiao LI Peng JIANG Zhenhua WEI Li Institute of Refrigeration and Cryogenics School of Mechanical EngineeringTongji UniversityShanghai 201804China Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji UniversityShanghai 201804China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China Department of Electrical Engineering School of Electronics and Information EngineeringTongji UniversityShanghai 201804China

stirling-type pulse tube cryocoolers(SPTCs)working at liquid-helium temperatures are appealing in space applications because of their promising advantages such as high reliability,compactness,*** efforts have been put in to develop SPTCs operating at liquid-helium temperatures especially with helium-4 as the working *** structure is essential to reach such low ***,both the regenerator of the last section and the pulse tube together with the phase shifter are precooled by its upper stage or by external cold source to a low temperature of around 20 ***,the precooling effects on the regenerator and the pulse tube are synthetic in previous studies,and their independent effects have not been studied *** this manuscript,the precooling effects on the regenerator and on the pulse tube together with the phase shifter are tested independently on a unique-designed precooled *** tested precooling temperature is between 13.3 K and 22 K,and the no-load refrigeration temperature gets down to 3.6 *** analyses and numerical calculations have been carried *** is found that the influence on the regenerator is remarkable,which is different from previous *** is also found that the precooling effects on the pulse tube are relatively weak because of the large pressure-induced enthalpy flow of a real gas working at the temperatures near to the critical ***,the phase shifting capacity is analyzed with two cases and with both helium-4 and helium-3 as working fluids,and it keeps quite constant after optimizing the frequency and the precooling temperature for each *** investigation on these independent effects will provide valid reference on the precooling mechanism study of SPTCs working down to liquid-helium temperatures.

关键词： stirling-type pulse tube cryocooler precooling effects liquid-helium temperatures

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Theoretical Analyses and Design of a 4 K Gas-Coupled Multi-Bypass stirling-type Pulse Tube Cryocooler

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Journal of Thermal Science 2022年第6期31卷 2077-2087页

作者： LIU Xuming YANG Biao CHEN Liubiao WANG Junjie ZHOU Yuan Chinese Academy of Sciences Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China

Gas-coupled stirling-type pulse tube cryocooler(SPTC) is currently the most compact and simplest configuration among all types of cryocoolers, but it is challenging to achieve a very low temperature. This paper investigates a gas-coupled SPTC which is capable of directly achieving a temperature of around 4 K. Theoretical analyses were performed based on SAGE to study the effects of employing one or more multi-bypass structures on apparent cooling performance, and internal working parameters. The simulation results indicate that the function of the multi-bypass is similar to that of a multi-stage gas-coupled structure, producing a pre-cooling effect on the lower-temperature section by increasing the acoustic power and the enthalpy flow in the pulse tube of the higher-temperature section. The cooperation of two multi-bypass structures can promote a higher enhancement of the cooling performance, but it is difficult to achieve the same cooling performance of a completely multi-stage gas-coupled SPTC due to weak phase-shifting capability and excessive reduction of the mass flow. Based on the model, the developed prototype has achieved a no-load temperature of 4.4 K, which shows the great potential of using a gas-coupled SPTC to obtain a cooling temperature below 4 K.

关键词： gas-coupled multi-bypass stirling-type pulse tube cryocooler

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Theoretical modeling and experimental verifications of the single-compressor-driven three-stage stirling-type pulse tube cryocooler

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Frontiers in Energy 2019年第3期13卷 450-463页

作者： Haizheng DANG Dingli BAO Zhiqian GAO Tao ZHANG Jun TAN Rui ZHA Jiaqi LI Ning LI Yongjiang ZHAO Bangjian ZHAO State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China University of Chinese Academy of Sciences Beijing 100049China Institute of Fundamental and Frontier Technology Midea Refrigerator Co.Ltd.Hefei 230601China

This paper establishes a theoretical model of the single-compressor-driven (SCD) three-stage stirlingtype pulse tube cryocooler (SPTC) and conducts experimental verifications. The main differences between the SCD type and the multi-compressor-driven (MCD) crycooler are analyzed, such as the distribution of the input acoustic power in each stage and the optimization of the operating parameters, in which both advantages and difficulties of the former are stressed. The effects of the dynamic temperatures are considered to improve the accuracy of the simulation at very low temperatures, and a specific simulation example aiming at 10 K is given in which quantitative analyses are provided. A SCD threestage SPTC is developed based on the theoretical analyses and with a total input acoustic power of 371.58 W, which reaches a no-load temperature of 8.82 K and can simultaneously achieve the cooling capacities of 2.4 W at 70 K, 0.17 W at 25 K, and 0.05 W at 10 K. The performance of the SCD three-stage SPTC is slightly poorer than that of its MCD counterpart developed in the same laboratory, but the advantages of lightweight and compactness make the former more attractive to practical applications.

关键词： single-compressor-driven three-stage stirling-type pulse tube cryocooler theoretical modeling experimental verification

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A　UNIFIED　APPROACH　TO　A　CLASS　OF　stirling-type　PAIRS

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Applied Mathematics:A Journal of Chinese Universities 1997年第2期 101-108页

作者： XU LIZHI (L.C. HSU) AND YU HONGQUAN

ＡＵＮＩＦＩＥＤＡＰＰＲＯＡＣＨＴＯＡＣＬＡＳＳＯＦＳＴＩＲＬＩＮＧ┐ＴＹＰＥＰＡＩＲＳＸＵＬＩＺＨＩ（Ｌ．Ｃ．ＨＳＵ）ＡＮＤＹＵＨＯＮＧＱＵＡＮＡｂｓｔｒａｃｔ．Ｈｅｒｅｐｒｅｓｅｎｔｅｄｉｓａｕｎｉｆｉｅｄａｐ... 详细信息

ＡＵＮＩＦＩＥＤＡＰＰＲＯＡＣＨＴＯＡＣＬＡＳＳＯＦＳＴＩＲＬＩＮＧ┐ＴＹＰＥＰＡＩＲＳＸＵＬＩＺＨＩ（Ｌ．Ｃ．ＨＳＵ）ＡＮＤＹＵＨＯＮＧＱＵＡＮＡｂｓｔｒａｃｔ．Ｈｅｒｅｐｒｅｓｅｎｔｅｄｉｓａｕｎｉｆｉｅｄａｐｐｒｏａｃｈｔｏａｗｉｄｅｃｌａｓ...

关键词： CLASS APPROACH OF PAIRS stirling-type TO UNIFIED

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