Influence of coupling form of annular regenerator in coaxial refrigerator

With the development of science and technology, cryogenic technology plays an important role in many fields, especially in aerospace, biology and life science. Advanced technology has increasingly high requirements for low temperature, ordinary low temperature has been unable to meet the demand, in some cases even need to use ultra-low temperature. Technology has improved as low temperatures have evolved, but basically there are three common cooling principles used: G-M cooling, Stirling cooling, and vascular cooling. There are three kinds of arrangement of the pulse tube refrigerator: linear, U-shaped and coaxial; But compared with the other two kinds of arrangement, the cooling performance of coaxial type is affected by radial heat transfer. In practical life, coaxial tube chiller is often used because of the advantages of small footprint. This paper mainly focuses on the current application of coaxial pulse tube refrigerator to study the effect of ring regenerator coupling form on refrigeration performance.