Thursday August 29, 2019 from 13:30 to 15:10
Computational fluid dynamics simulations and experimental investigations on a 1-2 K Joule-Thompson cryocooler precooled by a three-stage Stirling-type pulse tube cryocooler
Tao ZHANG1,2, Rui ZHA1,2, Jun TAN1,3, Jiaqi LI1,2, Yongjiang ZHAO1,2, Bangjian ZHAO1,2, Haizheng DANG1,3.
1Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, People's Republic of China; 2University of Chinese Academy of Sciences, Beijing, People's Republic of China; 3Shanghai Boreas Cryogenics Co., Ltd, Shanghai, People's Republic of China
The temperature of 1-2 K is crucial to the low-Tc superconducting and deep space exploration. The Joule-Thomson (JT) cryocooler coupled with a three-stage Stirling-type pulse tube cryocooler (SPTC) is an effective way of achieving the required low temperature and high efficiency.
In this paper, a computational fluid dynamics (CFD) model is established for the JT cryocooler, in which the flow and heat transfer processes are simulated and analyzed. The distributions of precooling capacities are optimized by analyzing exergy losses caused by heat transfer.
The effects of the three stage precooling temperatures, the precooling capacities and the high pressure before the JT valve on the cooling performance are also studied in depth.
The no-load temperatures of 2.2 K and 1.42 K are achieved in the model with He-4 and He-3 as working fluids, respectively. The corresponding experimental verifications are underway.