Speaker
Description
With the development of the pulse tube refrigerator, the efficiency increasing meets a technology neck with traditional phase shifter such as double inlet or inertance tube. A displacer as phase shifter is one method to overcome this problem. The displacer with a rod is the ideal phase shifter till now, the phase adjustment is free, and the stroke can be controlled by the rod diameter. Unlike Stirling refrigerator in which the diameter of the displacer is limited by the diameter of the cold finger, the diameter of the displacer in the displacer pulse tube refrigerator is free for design. The diameter effect of the displacer is investigated by numerical simulation, which shows that the diameter of the displacer with optimum displacer rod diameter has no big influence to the efficiency and cooling power while the stroke decreasing with the increasing of the displacer diameter. The regenerator length effect to the displacer is also investigated, too