Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser

Nobumichi Fujisawa, Shotaro Hara, Yutaka Ohta, Takashi Goto

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

5 Citations (Scopus)

Abstract

Experiments and numerical analyses were used to investigate the unsteady behavior of a vortex generated on the leading-edge of a diffuser (i.e., leading-edge vortex (LEV)) and the diffuser stall inception in a centrifugal compressor equipped with vaned diffusers. The LEV is distinct from the separation vortex of the diffuser's leading edge and passage vortex of the diffuser; it is generated by the accumulation of vortices caused by the velocity gradient of the impeller discharge flow. The LEV increases with decreasing velocity in the diffuser passage and forms a huge flow blockage within the diffuser passage. Therefore, the LEV may help cause the diffuser stall inception in the centrifugal compressor. A diffuser vane, that was tapered only on the hub side was designed and used in the experiment. The results of the computational fluid dynamics analysis and experiments showed that the tapered diffuser vane can suppress LEV evolution during off-design operations. Therefore, the tapered diffuser vane may control the diffuser stall inception in a centrifugal compressor by suppressing LEV evolution.

Original languageEnglish
Title of host publicationSymposia
Subtitle of host publicationFluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Flow Manipulation and Active Control: Theory, Experiments and Implementation; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791846223
DOIs
Publication statusPublished - 2014 Jan 1
EventASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2014, Collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels - Chicago, United States
Duration: 2014 Aug 32014 Aug 7

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
Volume1B
ISSN (Print)0888-8116

Conference

ConferenceASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2014, Collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels
CountryUnited States
CityChicago
Period14/8/314/8/7

ASJC Scopus subject areas

  • Mechanical Engineering

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    Fujisawa, N., Hara, S., Ohta, Y., & Goto, T. (2014). Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. In Symposia: Fluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Flow Manipulation and Active Control: Theory, Experiments and Implementation; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FEDSM2014-21242