Influence of minor geometric features on Stirling pulse tube cryocooler performance

[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.

[发布机构] 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

[效力级别] 物理学 [学科分类] 材料科学（综合）

[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