Advances on a cryogen-free Vuilleumier type pulse tube cryocooler |
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| Affiliation: | 1. Key Laboratory of Cryogenics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Lihan Cryogenics Co., Ltd, Shenzhen 518055, China;4. University of Twente, P.O.B. 217,7500 AE, Enschede, The Netherlands;1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China;2. Shanghai Institute of Technical Physics, Chinese Academy of Science, 500 Yutian Road, Shanghai 200083, China;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, PR China;2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou 310027, PR China;3. Kunming Institute of Physics, Kunming, 650223, PR China;1. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Energy Research Institute @ NTU, Nanyang Technological University, 637141, Singapore;2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore |
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| Abstract: | This paper presents experimental results and numerical evaluation of a Vuilleumier (VM) type pulse tube cryocooler. The cryocooler consists of three main subsystems: a thermal compressor, a low temperature pulse tube cryocooler, and a Stirling type precooler. The thermal compressor, similar to that in a Vuilleumier cryocooler, is used to drive the low temperature stage pulse tube cryocooler. The Stirling type precooler is used to establish a temperature difference for the thermal compressor to generate pressure wave. A lowest no-load temperature of 15.1 K is obtained with a pressure ratio of 1.18, a working frequency of 3 Hz and an average pressure of 2.45 MPa. Numerical simulations have been performed to help the understanding of the system performance. With given experimental conditions, the simulation predicts a lowest temperature in reasonable agreement with the experimental result. Analyses show that there is a large discrepancy in the pre-cooling power between experiments and calculation, which requires further investigation. |
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| Keywords: | Vuilleumier type pulse tube cryocooler Thermal compressor Numerical simulations |
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