Measurement of Rotating Stall in a Centrifugal Blower by Semiconductor Laser 2-Focus Velocimeter (1st Report, Measurement of Blade-to-Blade Distribution of Velocity Fluctuation)

Daisaku Sakaguchi, Masahiro Ishida, Hironobu Ueki, Taufan Surana

Research output: Contribution to journalArticlepeer-review

Abstract

For detecting the rotating stall observed at a low flow rate in a centrifugal blower with a backward-leaning blade impeller, blade-to-blade variation of velocity fluctuation was measured in the impeller, immediately downstream of the impeller and in the vaneless diffuser. Measurement was conducted by means of the spot-focus-type semiconductor laser 2-focus velocimeter developed by the authors. This L2F velocimeter has a narrow-band spatial-filter effect within ±1.5 degrees of flow angle fluctuation. The fluctuations of velocity and flow angle were analyzed on the basis of the probability density distribution. The change of the blade-to-blade relative velocity distribution due to flow rate was clearly shown, and it was determined that the origin of rotating stall was in the vaneless diffuser because the blade-to-blade velocity fluctuation distribution in the impeller was hardly affected by the large velocity fluctuation due to the rotating stall which occurred in the vaneless diffuser.

Original languageEnglish
Pages (from-to)899-904
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume60
Issue number571
DOIs
Publication statusPublished - 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

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