Numerical evaluation of the unsteady flow in a centrifugal compressor with Vaned diffuser via Urans approach

Ali Zamiri, Byung Ju Lee, Jin Taek Chung

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

3 Citations (Scopus)

Abstract

The three dimensional, compressible, unsteady Navier-Stokes equations are solved to investigate the flow field of a centrifugal compressor with high compression ratio. Computational domain is consisted of an inlet bell and impeller with splitter blades followed by a two dimensional wedge vaned diffuser. The numerical method is validated by comparing the computational results with the experiments in terms of pressure ratio and compressor efficiency. The present study focuses on the unsteady pressure fluctuations and entropy production within the impeller and diffuser passages at the compressor design point. It is shown that the interaction between the impeller and diffuser blades leads to unsteadiness at the interface region and a pulsating behavior within the diffuser passages. Pressure waves with different convective velocities, generated by the impellerdiffuser interaction and pseudo-periodic unsteady separation bubbles, are captured in time/space domain along the diffuser blade surfaces. The pressure fluctuation spectra captured at the impeller-diffuser interface is evaluated to analyze the noise characteristics of the centrifugal compressor as a main source of blade passing frequency noise.

Original languageEnglish
Title of host publicationTurbomachinery
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume2D-2016
ISBN (Electronic)9780791849729
DOIs
Publication statusPublished - 2016
EventASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016 - Seoul, Korea, Republic of
Duration: 2016 Jun 132016 Jun 17

Other

OtherASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016
CountryKorea, Republic of
CitySeoul
Period16/6/1316/6/17

ASJC Scopus subject areas

  • Engineering(all)

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    Zamiri, A., Lee, B. J., & Chung, J. T. (2016). Numerical evaluation of the unsteady flow in a centrifugal compressor with Vaned diffuser via Urans approach. In Turbomachinery (Vol. 2D-2016). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2016-57538