Numerical analysis of miniature coaxial Stirling type pulse tube cryocooler with a modified reservoir

A Numerical model of a compact coaxial Stirling pulse tube cryocooler with a cooling capacity not less than 2W at 80K is done. The performance characteristics with varying geometrical parameters are simulated. The Inertance Pulse Tube Cryocooler (IPTC) with a modified reservoir is suggested, where the reverse fluctuation of pressure in the compressor case is used instead of the steady pressure in the reservoir to shift the phase of the flow velocity at the hot end of the pulse tube. Therefore, the large reservoir volume of the cryocooler could be reduced, to make the cryocooler compact. The performance of the cryocooler was investigated and compared with the IPTC. The simulation results show that the cryocooler with modified reservoir can work as efficient as inertance type pulse tube cryocooler.