Analysis of secondary flow behavior in low solidity cascade diffuser of a centrifugal blower

Masahiro Ishida, Tengen Murakami, Daisaku Sakaguchi, Hironobu Ueki, Hiroshi Hayami, Yasutoshi Senoo

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

10 Citations (Scopus)

Abstract

Aiming at reducing noise without deterioration of diffuser performance in a low solidity cascade diffuser (LSD) of a centrifugal blower, the authors have proposed to locate a shallow and short groove or a slot between the diffuser wall and the LSD blade tip limiting to near the blade leading edge. The effect of the LSD blade tip-groove on the blower characteristics and the noise characteristics were investigated experimentally as well as numerically. The mechanism being able to maintain the high LSD blade loading even at small flow rates was pursued in view points of the vortex formation and the induced secondary flow. In addition, the effect of the tip-groove length on the vortex formation in the shroud tip-groove and the secondary flow behavior in the LSD were analyzed numerically and an optimum tip-groove configuration was proposed. It is concluded that formations of the stable and intense vortex in the shroud tip-groove and the recirculating secondary flow along the shroud wall toward the impeller exit are the key factors for achieving a high LSD performance and reducing noise simultaneously at small flow rates.

Original languageEnglish
Title of host publicationASME Turbo Expo 2010
Subtitle of host publicationPower for Land, Sea, and Air, GT 2010
Pages1973-1982
Number of pages10
EditionPARTS A, B, AND C
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow, United Kingdom
Duration: Jun 14 2010Jun 18 2010

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A, B, AND C
Volume7

Other

OtherASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
Country/TerritoryUnited Kingdom
CityGlasgow
Period6/14/106/18/10

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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