Performance analysis on free-piston Stirling cryocooler based on an idealized mathematical model

Cryogenic Engineering Conference 2017

材料科学;物理学

Guo, Y.X.^1,2 ; Chao, Y.J.^1,2 ; Gan, Z.H.^1,2,3 ; Li, S.Z.^1,2 ; Wang, B.^1,2

Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou

310027, China^1

Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou

310027, China^2

National Quality Inspection Center of Refrigeration Equipment (Henan), Minquan

476800, China^3

关键词: Cooling Capacity;    Damping forces;    Driving mechanism;    Flow resistance;    Free piston;    Performance analysis;    Stirling cryocoolers;    Thermodynamic characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012174/pdf
DOI  :  10.1088/1757-899X/278/1/012174

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Free-piston Stirling cryocoolers have extensive applications for its simplicity in structure and decrease in mass. However, the elimination of the motor and the crankshaft has made its thermodynamic characteristic different from that of Stirling cryocoolers with displacer driving mechanism. Therefore, an idealized mathematical model has been established, and with this model, an attempt has been made to analyse the thermodynamic characteristic and the performance of free-piston Stirling cryocooler. To certify this mathematical model, a comparison has been made between the model and a numerical model. This study reveals that due to the displacer damping force necessary for the production of cooling capacity, the free-piston Stirling cryocooler is inherently less efficient than Stirling cryocooler with displacer driving mechanism. Viscous flow resistance and incomplete heat transfer in the regenerator are the two major causes of the discrepancy between the results of the idealized mathematical model and the numerical model.