Visualization of rotating vortex in a centrifugal blower impeller

D. Tsugita, C. K.P. Kowshik, Y. Ohta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Rotating instability, RI, is a well-known unsteady phenomenon occurring in the off-design operation of various types of turbomachinery systems. However, the generation mechanism as well as its unsteady characteristics, especially in the case of centrifugal machines, has not yet been investigated in detail. In the present paper, therefore, research attention is focused on an unsteady vortex rotating along the impeller periphery, which is considered to be the cause of the RI, and its characteristics are investigated by experiments and two kinds of CFD analyses. A significant amplitude increase within a frequency band below the blade passing frequency is found to be caused by irregular change of the vortex rotating speed.

Original languageEnglish
Pages (from-to)207-214
Number of pages8
JournalJournal of Visualization
Issue number3
Publication statusPublished - 2012 Aug 1


  • Centrifugal blower
  • Correlation analysis
  • Rotating instability
  • Rotating vortex

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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