Investigation of deflector effect on cavitation in an axisymmetric gate slot by means of AE measurement

Masayuki Shintani, Anh Viet Truong, Yuka Iga, Toshiaki Ikohagi

Research output: Contribution to journalArticlepeer-review

Abstract

To take up the three-dimensional axisymmetric gate slot concerining with the gate slot possessed in hydraulic equipment, such as, a gate valve, the state of cavitation of the gate slot was investigated by Acoustic Emisson (AE) measurement. The relationship between AE energy level and cavitation condition was analyzed by the root-mean-square (RMS) of acoustic wave. Moreover, a new AE parameter "relative accumulated intensity•• (RAI)" was defined in order to estimate the erosion tendency of cavitation. Combining with the result of impulsive pressure measurement, the relationship between the erosive damage and the high amplitude generation of AE wave is confirmed by using RAI. In consideration of deflector effect, the AE measurement showed that the conical shape installed on the upstream side of gate slot makes the cavitation erosion increased, and the offset shape on the downstream side of gate slot makes the cavitation erosion decreased significantly.

Original languageEnglish
Pages (from-to)1210-1218
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume77
Issue number777
DOIs
Publication statusPublished - 2011

Keywords

  • AE
  • Axisymmetric gate slot
  • Cavitation
  • Conical
  • Deflector
  • Erosion
  • Offset
  • Pipe flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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