Analytical and experimental study on the phase-shifting characteristics of inertance tube of pulse tube cryocoolers working at super high frequencies

Abstract

Increasing the operating frequency and enhancing the energy density per unit volume constitute a pivotal development direction for pulse tube cryocoolers. The phase angle between the pressure wave and mass flow rate is a crucial parameter for maintaining a high efficiency in pulse tube cryocoolers, and is typically adjusted using a combination of an inertance tube and a reservoir. This paper analyzes the working mechanism of the phase shift in the inertance tube, and explains the effects of parameter changes on the phase shifting through simulations and experiments, focusing on the frequency range of 150 Hz to 250 Hz. This analysis verifies the feasibility of utilizing the combination of inertance tube and reservoir in pulse tube cryocoolers operating at super high frequencies.