CFD Simulation of Inertance-Tube Pulse Tube Refrigerator with Variable Cross Section of Regenerator and Pulse Tube

Abstract

The computational fluid dynamics simulation of inertance tube pulse tube refrigerator with linear cross section and variable cross section of regenerator and pulse tube are presented in this paper. Volume of regenerator and pulse tube were kept same as linear cross section of regenerator and pulse tube for all cases. Five models with different cone angles and variable length of the convergent or divergent type regenerator and pulse tube were designed for each case. To optimize the cone angle where the performance of the inheritance tube pulse tube refrigerator is maximized, two models were introduced to simulate two kinds of pulse tube refrigerator with tapered regenerator and tapered pulse tube. The linear inertance tube pulse tube refrigerator was simulated to validate with Cha et.al. model.The variable cross section regenerator inertance tube pulse tube refrigerator model and variable cross section pulse tube inertance tube pulse tube refrigerator model were simulated to find out the existence optimum cone angle for tapered regenerator and tapered pulse tube separately. The simulation results showed that convergent type of regenerator improves system performance by improving cooling power and COP of the inertance tube pulse tube refrigerator. Similarly, it is shown that divergent type pulse tube is used to improve the performance of the system.