The role of tip leakage vortex breakdown in flow fields and aerodynamic characteristics of transonic centrifugal compressor impellers

Kazutoyo Yamada, Masato Furukawa, Hisataka Fukushima, Seiichi Ibaraki, Isao Tomita

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

8 Citations (Scopus)

Abstract

This paper describes the experimental and numerical investigationson unsteady three-dimensional flow fields in two types of transonic centrifugal compressor impellers with different aerodynamic characteristics. In the experimental results, the frequency spectra of the pressure fluctuations, which were measured with the high-response pressure transducers mounted on the casing wall just upstream of the impeller, turned out to be quite different between the compressor impellers at stall condition. 0The simulation results also showed different stall pattern for each compressor impeller. In the compressor impeller with a better performance at off-design condition, the stall cell was never formed despite decreasing flow rate and instead all the passages were covered with a reverse flow near the tip, where the vortex breakdown happened in the tip leakage vortex of full blade and led to the unsteadiness in the impeller. The vortex breakdown happened in all the passages prior to the stall and generated a blockage near the tip. This means that even with the advent of rotating stall the flow could not return to a normal undistorted condition in unstalled region, because all the passages are already occupied by the blockage due to the vortex breakdown. As a result, the rotating stall cell could not appear in the impeller. In the other compressor impeller, the rotating stall cell was formed at stall inception without the vortex breakdown in the tip leakage vortex of full blade, and developed with decreased flow rate.

Original languageEnglish
Title of host publicationASME 2011 Turbo Expo
Subtitle of host publicationTurbine Technical Conference and Exposition, GT2011
Pages2111-2123
Number of pages13
EditionPARTS A, B, AND C
DOIs
Publication statusPublished - Dec 1 2011
EventASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 - Vancouver, BC, Canada
Duration: Jun 6 2011Jun 10 2011

Publication series

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

Other

OtherASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011
CountryCanada
CityVancouver, BC
Period6/6/116/10/11

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Yamada, K., Furukawa, M., Fukushima, H., Ibaraki, S., & Tomita, I. (2011). The role of tip leakage vortex breakdown in flow fields and aerodynamic characteristics of transonic centrifugal compressor impellers. In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 (PARTS A, B, AND C ed., pp. 2111-2123). (Proceedings of the ASME Turbo Expo; Vol. 7, No. PARTS A, B, AND C). https://doi.org/10.1115/GT2011-46253