Influence of the inclined leading edge diffuser vanes on the aerodynamic performance of a transonic centrifugal compressor

Ali Zamiri, Byung Ju Lee, Jin Taek Chung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Three-dimensional, compressible, Reynolds-averaged Navier-Stokes equations were solved to investigate the influence of the inclined leading edge diffuser vanes on the flow field and performance of a transonic centrifugal compressor with a high compression ratio. Diffuser vanes with leading edge inclined at different angles (10 different cases) were numerically modeled to investigate the effects that the inclined leading edge of the diffuser vane had on the diffuser pressure recovery and total pressure loss characteristics of the compressor. Diffuser vanes with an inclined leading edge reduce the interaction between the impeller discharge flow and the leading edge of the diffuser, which results in a reduced separation inside the diffuser passages. A maximum diffuser pressure recovery coefficient of 0.7185, was observed at a 30-degree inclination angle from hub-to-shroud. Moreover, in the case of inclination angles greater than 60 degrees for both hub-to-shroud and shroud-to-hub, there is a significant reduction in the pressure recovery, efficiency and pressure ratio.

Original languageEnglish
Pages (from-to)5557-5568
Number of pages12
JournalJournal of Mechanical Science and Technology
Volume31
Issue number11
DOIs
Publication statusPublished - 2017 Nov 1

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Centrifugal compressors
Aerodynamics
Recovery
Compression ratio (machinery)
Navier Stokes equations
Compressors
Flow fields

Keywords

  • Aerodynamic performance
  • Centrifugal compressor
  • Computational fluid dynamics
  • Inclined leading edge
  • Vaned diffuser

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Influence of the inclined leading edge diffuser vanes on the aerodynamic performance of a transonic centrifugal compressor. / Zamiri, Ali; Lee, Byung Ju; Chung, Jin Taek.

In: Journal of Mechanical Science and Technology, Vol. 31, No. 11, 01.11.2017, p. 5557-5568.

Research output: Contribution to journalArticle

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N2 - Three-dimensional, compressible, Reynolds-averaged Navier-Stokes equations were solved to investigate the influence of the inclined leading edge diffuser vanes on the flow field and performance of a transonic centrifugal compressor with a high compression ratio. Diffuser vanes with leading edge inclined at different angles (10 different cases) were numerically modeled to investigate the effects that the inclined leading edge of the diffuser vane had on the diffuser pressure recovery and total pressure loss characteristics of the compressor. Diffuser vanes with an inclined leading edge reduce the interaction between the impeller discharge flow and the leading edge of the diffuser, which results in a reduced separation inside the diffuser passages. A maximum diffuser pressure recovery coefficient of 0.7185, was observed at a 30-degree inclination angle from hub-to-shroud. Moreover, in the case of inclination angles greater than 60 degrees for both hub-to-shroud and shroud-to-hub, there is a significant reduction in the pressure recovery, efficiency and pressure ratio.

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