Influence of the Gas Volume in the Void Tube Connecting Compressor and Inertance Tube on the Oscillating Flow in an Inertance Tube Phase Shifting System

Influencesof thegas volumein the void tube (connecting tube), connecting compressor and inertance tube, on the oscillating flowcharacteristics are experimentally investigated. Four void tubes, whose volumes are different from each other, are chosen to connect the compressor and the inertance tube respectively. Piston displacement of the compressor and dynamic pressure at the outlet of the compressor are measured by a laserdisplacement sensor and a quartz pressure sensor respectively. This investigation focuses on the piston displacement and mass flows at three special positions of the experimental system.The change of the amplitudes and phase angles of the piston displacement and the three mass flows caused by varying the void tubes with different dynamic pressures and frequencies are studied. This investigation is helpful to study the influence ofthe gas volumein the connecting parts of an inertance tube pulse tube cryocooler, such as transfer tube, cold finger and pulse tube, on oscillating characteristics of the cooler.