Unsteady flow structure in an axial compressor at windmill condition

Takashi Goto, Dai Kato, Yutaka Ohta, Eisuke Outa

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

15 Citations (Scopus)


This study investigates experimentally and numerically unsteady flow fields in an axial compressor operating at highflow rate in order to understand the flow structure in the stator row operating at windmill condition. The experimental and numerical data are compared by time- And phase-lock-averaged techniques. Additionally, unsteady vortex structure is investigated by numerical technique. At windmill condition, the incidence angle to the stator row becomes extremely negative. Therefore, large separation occurs near pressure surface in the stator passage. The experimental and numerical results indicate that a large vortex is generated in the separation area. According to the numerical results, part of the vortex migrates downstream, and the vortex produces blockage of the main stream of the stator passage. Therefore, net flow area in the stator passage becomes small so that the flow between the vortex and suction side of stator vane is accelerated. As a result, the total pressure deterioration is generated in the stator passage because the high speed flow and the vortex cause high shear.

Original languageEnglish
Title of host publicationTurbomachinery
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791845639
Publication statusPublished - 2014 Jan 1
EventASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 - Dusseldorf, Germany
Duration: 2014 Jun 162014 Jun 20

Publication series

NameProceedings of the ASME Turbo Expo


ConferenceASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014

ASJC Scopus subject areas

  • Engineering(all)


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