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Description
A two-stage Stirling cryocooler for cooling at temperatures of 100 K and 50 K is designed and its performance is experimentally validated. In the development process of the Stirling cryocooler, we firstly designed and evaluated the performance of a single-stage Stirling cryocooler operating at 100 K to calibrate the numerical model. The results revealed that the cooling performance of the single-stage Stirling cryocooler was lower than the design target, primarily due to the smaller dynamic pressure. The heat transfer in the cylinder spaces and the leakage within the linear compressor contribute to the reduced dynamic pressure. Building upon the improved numerical analysis, the two-stage Stirling cryocooler is designed and fabricated. Stainless steel mesh #400 is used for the regenerator matrix, and the stepped displacer is made of phenolic tubes having different diameters. Flexure bearing, providing the restorative force to the displacer, is designed and manufactured through finite element method (FEM) analysis, with the spring constant of the flexure bearings matching the design values within a 10% error. The slit-type heat exchangers are utilized as the aftercooler and the cold-end heat exchangers. The detailed development steps and the performance analysis are discussed in the present paper. This study provides comprehensive insights into the enhancement of numerical models for designing Stirling cryocooler and the development process of Stirling cryocooler.
| Submitters Country | South Korea |
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