Investigation on numerical optimization method for high capacity two-stage 4 K pulse tube cryocooler

Two-stage 4 K pulse tube cryocooler is one of the most promising coolers for low temperature applications. However, an efficient and reliable method is still absent for pulse tube optimization in liquid helium temperatures due to complex heat and mass flow oscillation. In this study, a two-stage pulse tube cryocooler model was built with a commercially-available software, SAGE (R). The DC flow effect on the performance was investigated and the filling ratio of second stage regenerator were numerically optimized With the model, a no-load temperature of 2.7 K and a cooling capacity of 0.5 W at 4.2 K were achieved, which is well-matched with the experimental results.