Research On The Coupling Characteristics Of Pneumatically Driven Split-Stirling Crvocoolers

In recent decades,the extensive applications of miniature crycoolers enable significant advancement in aerospace technology,superconducting,medical diagnostics and therapeutics to name a few.Stirling cryocooler is of the most widely used miniature cryocoller and been intensively studied.There are two types-electric and pneumatic-of Stirling cryocoolers based on its configuration.The former type can achieve a great phasor through the electronic control system,but has complicated configuration;the pneumatic Stirling cyocooler is simpler and more compact in structure,but it is difficult to achieve a satisfying phasor relation between mass flow and pressure wave.Based on the difficulty of research for pneumatically driven split-Stirling Cryocoolers,in this study,we mainly did the following work:(1)We proposed a complete dynamic coupling model covering the compressor and the expander,and revealed the dependence of the cryocooler’s performance on various important parameters to provide guidance for the design and analyses of pneumatically driven split-Stirling cryocoolers.(2)An analytical model of the pneumatically driven split-Stirling cryocooler was also set up.The analytical results matches well with the numerical simulation.(3)The experimental apparatus for pneumatically driven split-Stirling cryocooler was set up.Controlled experiments and characterization of cooling performance and pressure ratio at the hot end verified the calculations.The experimental results are consistent with the simulations,illustrating the accruracy of the Sage model and rationality of the coupling model.These results highlight the advantages and the importance of the proposed coupling model for the pneumatically driven split-Stirling cryocoolers,suggesting the analysis and design guidance for the furture applications.