Abstract
A cold compressor is a key equipment in a superfluid helium refrigeration system. It helps to make the 2 K helium refrigerator more compact, increase the cycle efficiency, and reduce the risk of air leakage. However, cold compressors have been applied only in relatively large 2 K helium refrigerators with mass flow rates of more than 25 g/s. To verify the feasibility of using a low mass flow rate cold compressor in the testing system of the China Initiative Accelerator Driven System (CiADS), the thermodynamic model of the 2 K cryogenic cycle was built. Then, a cold compressor with a low mas flow rate was designed, and its performance was numerically studied based on the one-dimensional self-written code and a three-dimensional computational fluid dynamics model, respectively. The total pressure ratio and isentropic efficiency of the cold compressor were 2.44 and 64.4 % at the design point of 3.5 g/s@36000 rpm, respectively. The small mass flow rate cold compressor was remarkably beneficial for the 2 K cryogenic systemas the exergy efficiency increased from 0.16 to 0.23 and the specific power consumption decreased from 604 W/W to 327 W/W. The research has preliminarily verified the practicality of using a small flow rate cold compressor in superfluid helium systems.
Published Version
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