Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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An experimental study on the cooling performance and the phase shift between piston and displacer in the Stirling cryocooler

  • Park, S. J. (Thermal & Fluid Environmental Department, Korea Institute of Machinery & Material) ;
  • Y. J. Hong (Thermal & Fluid Environmental Department, Korea Institute of Machinery & Material) ;
  • Kim, H. B. (Thermal & Fluid Environmental Department, Korea Institute of Machinery & Material) ;
  • D. Y. Koh (Thermal & Fluid Environmental Department, Korea Institute of Machinery & Material) ;
  • B. K. Yu (Wooyoung) ;
  • Lee, K. B. (Department of Mechanical Engineering, Pusan University)
  • Published : 2003.05.01
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Abstract

In the design of the split type free displacer Stilting cryocooler the motion of the displacer is very important to decide the cooling capacity, which depends upon the working gas pressure, the swept volume in the compression space and the expansion space, operating frequency, the phase shift between piston and displacer, etc. In this study, Stirling cryocooler actuated by the electric farce of the dual linear motor is designed and manufactured. Cool down characteristics of the cold end with laser displacement sensor in the expander of the Stilting cryocooler is evaluated. The charging pressure was 15kg$_{f}$/$\textrm{cm}^2$ and operating frequency was 50Hz. Input power and the lowest temperature were about 32W and 67K, respectively. And, displacement of the piston is measured by LVDTs (Linear Variable Differential Transformers), displacement of thedisplacer is measured by laser optic method, and phase shift between piston and displacer is discussed. As the peak-to-peak pressure of the compressor was increased, peak-to-peak displacement of the displacer was increased. The peak-to-peak displacement of the displacer increases in the range of 0 - 64.5Hz(resonant frequency of the displacer), but decreases steeply when the operating frequency is bigger than the resonant frequency. Finally when the phase shift between displacements of the Piston and displacer is 45。, operating frequency is optimum and is decided by resonant frequency of the expander, mass and cross section area of the displacer and constant by friction and flow resistance.e.

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References

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