CFD modeling and experimental verifications of a four-stage Stirling-type pulse tube cryocooler

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Zha, Rui^1^2 ; Zhang, Tao^1^2 ; Li, Jiaqi^1^2 ; Tan, Jun^1^3 ; Zhao, Yongjiang^1^2 ; Zhao, Bangjian^1^2 ; Dang, Haizheng^1^3

State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai

200083, China^1

University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing

100049, China^2

Shanghai Boreas Cryogenics Co. Ltd, 1388 Shuidian Road, Shanghai

200434, China^3

关键词: Deep-space exploration;    Experimental verification;    Liquid helium temperature;    Operating mechanism;    Phase relationships;    Stirling type pulse tube cryocooler;    Thermal non-equilibrium;    Two Dimensional (2 D);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012037/pdf
DOI  :  10.1088/1757-899X/502/1/012037

来源: IOP

【 摘 要 】

This paper conducts CFD modeling and experimental verifications of a four-stage Stirling-Type pulse tube cryocooler (SPTC) aimed to reach liquid helium temperature for low Tc superconducting devices and deep space exploration. A two-dimensional (2-D) axis-symmetric CFD model with the thermal non-equilibrium mode is developed to simulate the internal operating mechanism. A cryogenic phase-shifting approach is employed to improve the phase conditions. Several cases are set to study the phase relationship between mass flow rate and dynamic pressure at the inlet and outlet of the regenerator. The effects of the operating frequency on flow and heat transfer processes in the pulse tube are also investigated. Based on the above numerical studies, a four-stage thermally-coupled SPTC is then developed and tested. It reaches a no-load temperature of 4.5 K and achieves cooling capacities of 10.5 W/80 K, 8.6 W/60 K, 1.5 W/30 K and 10 mW/5 K experimentally.