The Study Of Modeling And Structure Design Of Single GM Cryocooler With Big Cooling Capacity

This paper analyses the performance of regenerator basing on the system design of single cryocooler with big cooling capacity, using thermodynamics theory, according to performance parameter the author puts up the design calculating, confirms the structure dimension of regenerator,material and filling proportion, builds the physics model of single GM cryocooler with big cooling capacity basing on the mass system thermodynamics theory, using the computing heat transfer dispersing analysis and boundary dealing fashion, according to the structure of regenerator computes by programming and using language of C, the result reflects the distributing rules of temperature at different point inside the regenerator.Through matching different compressor into GM refrigerator, selecting different regenerator material and filling proportion. tries out 20 test in total, draws the conclusions as follows: firstly the lowest temperature reaches 25.7K,getting 7.4W@30K, getting 21W@40K with C50W compressor, while the lowest temperature reaches 20K,getting 20W@30K,getting 37.1W@40K with C80W compressor; Secondly test validates the performance with 1200 pieces phosphor-copper meshes,300g shot and 960 pieces phosphor-copper meshes,500g shot, drawing the conclusion, getting the best regenerator material and filling proportion, 1200 pieces phosphor-copper meshes and 300g shot, the filling proportion is 3:1,getting the highest cooling capacity 20W@30K,getting the highest cooling capacity 37.1W@40K.Finally the author puts up qualitative analysis on the regenerator, summarizes the means and approaches which can make the refrigerator losing lowest, accumulating the experience for the practical refrigerator's design.