Numerical study of a cryogen-free vuilleumier type pulse tube cryocooler operating below 10 K

Cryogenic Engineering Conference 2017

材料科学;物理学

Wang, Y.N.^1,2 ; Wang, X.T.^1,2 ; Dai, W.^1,2 ; Luo, E.C.^1,2

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Component dimensions;    Cooling efficiency;    Displacement amplitudes;    Numerical investigations;    Optimum efficiency;    Pulse tube cryocoolers;    Thermal compressors;    Working temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012047/pdf
DOI  :  10.1088/1757-899X/278/1/012047

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper presents a numerical investigation on a Vuilleumier (VM) type pulse tube cooler. Different from previous systems that use liquid nitrogen, Stirling type pre-coolers are used to provide the cooling power for the thermal compressor, which leads to a convenient cryogen-free system and offers the flexibility of changing working temperature range of the thermal compressor to obtain an optimum efficiency. Firstly, main component dimensions were optimized with lowest no-load temperature as the target. Then the dependence of system performance on average pressure, frequency, displacer displacement amplitude and thermal compressor pre-cooling temperature were studied. Finally, the effect of pre-cooling temperature on overall cooling efficiency at 5 K was studied. A highest relative Carnot efficiency of 0.82 % was predicted with an average pressure of 2.5 MPa, a frequency of 3 Hz, a displacer displacement amplitude of 6.5 mm, ambient end temperature 300 K and pre-cooling temperature 65 K, respectively.