Abstract
So far, the amount of the so-called shuttle loss in Gifford-McMahon (GM) refrigerators has been estimated by measuring warm-up rates of the cold stage. By this method, the measurement is carried out by reciprocating the displacer without operating the compressor. However, as shown in the previous reports by the present authors, the amount of the shuttle loss is affected not only by the reciprocating motion of the displacer but also by pressure oscillation of the gas layer between the cylinder and the displacer. In this paper, we measured the total amount of shuttle loss under actual operating conditions. Experimental results obtained in this experiment are compared with the linearized thermoacoustic theory developed by the authors, and issues of the measurement are printed out.
