抄録
A new numerical simulation of a pneumatic driven GM refrigerator is developed. To accurately predict the refrigeration capacity of a pneumatic driven GM refrigerator operating at close to 4K, full one-dimensional governing equations for expander are solved using the finite difference method considering variable physical properties of helium and regenerator materials. Furthermore, the numerical model also includes the compressor unit to estimate its influence of pressure oscillation as well as its performance. In this paper, the calculation results of a two-stage pneumatic driven 4K-GM refrigerator, with magnetic materials in the 2nd-stage, are presented briefly. The predicted refrigeration capacity at 4K and temperature fields are in good accordance with both our experimental results and with the experimental data from the literature.
