Numerical studies on the effects of hot end temperature on a single-stage multi-bypass type pulse tube cryocooler

Cryogenic Engineering Conference 2015

材料科学;物理学

Liu, S.X.^1,2 ; Chen, L.B.^1,2 ; Zhou, Y.^1 ; Wang, J.J.^1

Key Laboratory of Cryogenics, Echnical Institute of Physics and Chemistry, CAS, Beijing

100190, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

关键词: End temperatures;    Mass flow rate;    Numerical results;    Operating environment;    Pulse tube cryocoolers;    Refrigeration performance;    Single stage;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012032/pdf
DOI  :  10.1088/1757-899X/101/1/012032

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The performance of pulse tube cryocooler is affected by the temperature of hot end, which is mainly influenced by the temperature of environment. Effects on a single-stage multi-bypass type pulse tube cryocooler are investigated by means of numerical simulation. For different opening of multi-bypass orifices, the refrigeration performances are studied when hot end temperature changed in a certain range, and some numerical results are provided and analysed. Together with the temperature at cold head and multi-bypass position, the mass flow rate through the multi-bypass orifice is affected significantly by the temperature of hot end, and the optimum opening of multi-bypass orifice decreases with hot end temperature increasing from 240 K to 320 K. Therefore, to select an optimal opening of bypass orifice according to the temperature of operating environment is necessary.