Simulation and parameter distribution study of high-capacity GM cryocoolers working in liquid helium temperature
To improve the cooling efficiency of GM cryocoolers working in liquid helium tem-perature and accelerate the product iteration speed,a comprehensive simulation of a two-stage GM cryocooler manufactured by CSIC Pride(Nanjing)Cryogenic Technology Co.,Ltd.was carried out by Sage.The cryocooler was driven by two KDC6000V compressors in parallel.Simulation results show that the first and second stage cooling capacities are 71.6 W@50 K and 2.6 W@4.2 K re-spectively,which are basically consistent with the experimental results.The total exergy loss,tem-perature and exergy flow distribution in the expansion chamber are analyzed by the simulation model.The analysis shows that the exergy flow entering the second heat exchanger accounts for 69.5％of the exergy flow in the first expansion chamber,and the temperature gradient along the lead of the second regenerator is too high,which points out the direction for further improvement.
liquid helium temperatureGM cryocoolerSageexergy loss
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