Incipient rotating stall characteristics measured by semiconductor L2F and pressure transducer in vaneless diffusers of centrifugal blowers

Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

In order to clarify the transient behavior from the non-stall condition to the developed rotating stall in vaneless diffuser of a centrifugal blower, blade-to-blade variations of velocity and wall pressure were measured immediately upstream and downstream of the impeller exit as well as in the vaneless diffuser by means of the semiconductor laser 2-focus velocimeter and the pressure sensor respectively. The specified auto-correlation coefficient of large scale disturbances with the wavelength larger than twice of the blade spacing show that the intermittent stall occurs prior to the developed rotating stall. By analyzing the flow-fluctuationellipse and the correlation coefficient with respect to the radial and tangential components of velocity fluctuation, it is found that the intermittent stall as well as the developed rotating stall are triggered by the interaction between the reverse flow in the diffuser entry region and the jet-wake like flow discharged from the impeller.

Original languageEnglish
Title of host publicationAircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791878545, 9780791878545
DOIs
Publication statusPublished - 2000
Externally publishedYes
EventASME Turbo Expo 2000: Power for Land, Sea, and Air, GT 2000 - Munich, Germany
Duration: May 8 2000May 11 2000

Publication series

NameProceedings of the ASME Turbo Expo
Volume1

Other

OtherASME Turbo Expo 2000: Power for Land, Sea, and Air, GT 2000
Country/TerritoryGermany
CityMunich
Period5/8/005/11/00

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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