Influence of minor geometric features on Stirling pulse tube cryocooler performance

Cryogenic Engineering Conference 2017

材料科学;物理学

Fang, T.^1 ; Spoor, P.S.^2 ; Ghiaasiaan, S.M.^1 ; Perrella, M.^1

Georgia Tech Cryo Lab, G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta

GA

30332, United States^1

Biomedical Division, Chart Inc., Troy

NY

12188, United States^2

关键词: Cold-end temperature;    Computational fluid dynamics simulations;    Cooling performance;    Geometric imperfection;    Multi-component systems;    Orientation sensitivities;    Pulse tube cryocoolers;    Stirling pulse tube cryocooler;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012140/pdf
DOI  :  10.1088/1757-899X/278/1/012140

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Minor geometric features and imperfections are commonly introduced into the basic design of multi-component systems to simplify or reduce the manufacturing expense. In this work, the cooling performance of a Stirling type cryocooler was tested in different driving powers, cold-end temperatures and inclination angles. A series of Computational Fluid Dynamics (CFD) simulations based on a prototypical cold tip was carried out. Detailed CFD model predictions were compared with the experiment and were used to investigate the impact of such apparently minor geometric imperfections on the performance of Stirling type pulse tube cryocoolers. Predictions of cooling performance and gravity orientation sensitivity were compared with experimental results obtained with the cryocooler prototypes. The results indicate that minor geometry features in the cold tip assembly can have considerable negative effects on the gravity orientation sensitivity of a pulse tube cryocooler.