Numerical simulation of three-stage gas coupled pulse tube refrigerator

Abstract

For its compact structure, small mass, no moving parts at low temperature, strong reliability and stability, Stirling pulse tube refrigerator is regarded as a major development direction of small refrigerator at low temperatures. In order to obtain lower no-load cooling temperature and higher cooling efficiency, multi-stage structure is often used in pulse tube refrigerator. In this paper, a model of three-stage gas-coupled pulse tube refrigerator with multi-bypass and double-inlet is designed by SAGE software. The effects of double-inlet and multi-bypass on the gas distribution of multi-stage pulse tube refrigerator are analyzed. The results show that the multi-bypass and double-inlet do not independently affect the minimum temperature of the refrigerator at no-load, and there is a coupling relationship between their opening. The numerical simulation results are of great value for the construction of a three-stage gas coupled pulse tube refrigerator prototype.