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Theoretical Analyses and Design of a 4 K Gas-Coupled multi-bypass Stirling-Type Pulse Tube Cryocooler

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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Dynamic Experimental Study of a multi-bypass PulseTube Refrigerator with Two-bypass Tubes

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Journal of Thermal Science 1998年第1期7卷 61-66页

作者： YonglinJu ChaoWang 等 CryogenicLaboratory ChineseAcademyofSciencesP.O.Box2711Beijing100080China CryogenicLaboratory Chi

A dynamic experimental apparatus to measure the instantaneous velocity and pressure in the multi-bypass pulse tube refrigerator (MPTR) was designed and constructed. Some theortant experimental results of the instantaneous measurements of the velocity and the pressure in the MPTR with two-bypass tubes during actual operation are presented. The effects of the middle-bypass version on the dynamic pressure and mass flow rate at the cold end of the pulse tube are evaluated from experimental ***-flow phenomena are observed in this MPTR. The reasons of the multi-bypass version improved the performance of pulse tube refrigerator are given.

关键词： pulse tube refrigerator multi-bypass dynamic experiment

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