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Thermodynamic Effect on a Cavitating Inducer in Liquid Nitrogen

[+] Author Affiliations
Yoshiki Yoshida, Satoshi Hasegawa, Mitsuru Shimagaki

Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan

Kengo Kikuta, Takashi Tokumasu

Tohoku University, Sendai, Miyagi, Japan

Noriaki Nakamura

Japan Science and Technorogy Agency, Miyagi, Japan

Paper No. FEDSM2005-77430, pp. 591-596; 6 pages
  • ASME 2005 Fluids Engineering Division Summer Meeting
  • Volume 2: Fora
  • Houston, Texas, USA, June 19–23, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4199-5 | eISBN: 0-7918-3760-2
  • Copyright © 2005 by ASME


For experimental investigations of the thermodynamic effect on a cavitating inducer, it is nesessary to observe the cavitation. However, visualizations of the cavitation are not so easy in cryogenic flow. For this reason, we estimated the cavity region in liquid nitrogen based on measurements of the pressure fluctuation near the blade tip. In the present study, we focused on the length of the tip cavitation as a cavitation parameter. Comparison of the tip cavity length in liquid nitrogen (80 K) with that in cold water (296 K) allowed us to estimate the strength of the thermodynamic effect. The degree of thermodynamic effect was found to increase with an increase of the cavity length. The estimated temperature depression caused by vaporization increased rapidly when the cavity length extended over the throat. In addition, the estimated temperature inside the bubble nearly reached the temperature of the triple point when the pump performance deteriorated.

Copyright © 2005 by ASME
Topics: Nitrogen



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