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Numerical and Experimental Analysis of a Stirling Type Single-stage Pulse Tube Cryocooler with Thermal Non-equilibrium Model

Author: YuYiBo
Tutor: QiuLiMin
School: Zhejiang University
Course: Refrigeration and Cryogenic Engineering
Keywords: CFD Pulse tube refrigerator Inertance tube Non - thermal equilibrium
CLC: TB651
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


Single-stage Stirling-type pulse tube refrigerator with a compact, high efficiency, high reliability, and a wide range of application prospects in the military, superconducting, medical, and other fields. Computational Fluid Dynamics (CFD) method has better applicability to describe the multi-dimensional flow and heat transfer characteristics, in the study of vascular refrigeration mechanism for initial applications. However, the relevant CFD software is used to simulate the regenerator and porous media model for the heat exchanger is a thermal equilibrium model is not reliable. The same time, due to the pulse tube refrigerator exist within the strongly non-linear effects, the actual dynamic changes of the parameters and gas parcels thermodynamic cycle, only theoretical qualitative analysis, the lack of quantitative research. Inertia tube the main phase modulation institutions Stirling-type pulse tube refrigerator with three commonly calculated inertia tube laminar flow assumptions are based on one-dimensional, pressure ratio deduced from, can not accurately describe turbulence and The boundary layer effect to the calculation results brought a large deviation. In view of this, we carry out the following tasks: 1 This article focuses on the assumption of thermal equilibrium in the porous medium model is improved using porous media model assumptions based on the non-thermal equilibrium CFD simulation of single-stage Stirling-type pulse tube refrigerator . Analysis of the heat transfer coefficient, pressure drop and effective thermal conductivity of a series of empirical parameters and physical parameters, and closer to the actual pulse tube refrigerator model. Using the improved model of iterative calculations, chiller internal pressure, velocity and temperature field. The pressure, speed, temperature, and other parameters of the dynamic process of change, and refrigerator gas parcels in various parts thermodynamic cycle, to further deepen the understanding of the working mechanism of the pulse tube refrigerator. This paper analyzes the status and calculation of gas flow inertia tube inertance tube three traditional methods, revealed that the calculated and experimental values ??there is a big error. Fluent comes with a variety of turbulence models and near-wall approach to find the most applicable to the calculation of the inertia tube model by comparison with experimental data. Build single-stage Stirling-type pulse tube refrigerator experiment, the different frequency, inflation pressure, enter the amount of electric power under refrigeration, and compared the simulation results of the simulation software Sage and cryocoolers whole both reached a good consistency.

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment > Refrigerator
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