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Theoretical Study on the Performance of a Wet Turbine for Helium Refrigerators

  • M. Obata
  • N. Saji
  • H. Asakura
  • S. Yoshinaga
  • T. Ishizawa
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE)

Abstract

In a large helium refrigerator, the power input can be reduced by using the expansion process of a wet turbine in place of a J-T valve (Joule Thomson valve). The cooled helium gas with a temperature between 6 K and 9 K and a pressure of 12 Bar is liquefied between 15 % and 80 % in the wet turbine, depending on the operating condition of the liquefying mode and the refrigerating mode. The turbine efficiency or performance is considered to be largely affected by the growth of the liquid phase in the expansion process of the turbine. In this study, a theoretical method is proposed to calculate the wetness effect of the helium on the turbine performance, and it is shown for a radial inflow wet turbine that the turbine output at 4.5 K is 5 % lower at 20 % of wetness and 20 % lower at 80 % wetness.

Keywords

Expansion Process Work Output Turbine Rotor Slip Ratio Turbine Inlet Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Б.M. TpOЯHOBCКИЙ original, “Atomic Energy Turbine” (1997 S. Nagasima translating to Japanese).Google Scholar
  2. 2.
    I.I. Kirillov, R. M. Yablonik “Fundamentals of Theory of Turbines Operating on Wet Steam” Translation, NASA TTF-661(1970) 104.Google Scholar
  3. 3.
    JSME Data Book “Heat Transfer” 4th Edition. (1986) 136,144.Google Scholar
  4. 4.
    F. J. Moody “Maximum Flow Rate of a Single Component, Two-phase Mixture” Trans. ASME, Ser. C, 87-1(1965)Google Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • M. Obata
    • 1
  • N. Saji
    • 2
  • H. Asakura
    • 2
  • S. Yoshinaga
    • 2
  • T. Ishizawa
    • 2
  1. 1.Kanazawa Institute of TechnologyNonoichi, IshikawaJapan
  2. 2.Ishikawajima-Harima Heavy Industries Co.,Ltd.Koto-ku, TokyoJapan

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