Influence of thermodynamic effect on sub-synchronous rotating cavitation and surge mode oscillation

Yoshiki Yoshida, Hideaki Nanri, Kengo Kikuta, Yusuke Kazami, Yuka Iga, Toshiaki Ikohagi

Research output: Contribution to journalArticlepeer-review

Abstract

To investigate the influence of the thermodynamic effect on the sub-synchronous rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74 K, 78 K and 83 K) with focusing on the fluctuation of the cavity length. Sub-synchronous rotating cavitation appeared at lower cavitation numbers in liquid nitrogen at 74 K, which was the same as that in cold water. In contrast, in liquid nitrogen at 83 K, the occurrence of sub-synchronous rotating cavitation was suppressed on the increase of thermodynamic effect due to the rising temperature. Furthermore, the unevenness of cavity length under the synchronous rotating cavitation was also decreased by the thermodynamic effect. However, surge mode oscillation occurred simultaneously under the condition of weakened synchronous rotating cavitation. Cavity lengths on the blades oscillated with the same phase maintained the uneven cavity pattern. It was estimated that the thermodynamic effect weakened the peripheral cavitation instability, i.e., synchronous rotating cavitation, but axial cavitation instability, i.e., surge mode oscillation, was induced easily because of the synchronization of the cavity fluctuation with an acoustic resonance in the present inlet-pipe system.

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume76
Issue number762
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • Acoustic resonance
  • Rotating cavitation
  • Surge mode oscillation
  • Thermodynamic effect

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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