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Numerical Investigation of the Effect of Different Back Sweep Angle and Exducer Width on the Impeller Outlet Flow Pattern of a Centrifugal Compressor With Vaneless Diffuser

[+] Author Affiliations
A. Hildebrandt, M. Genrup

Lund Institute of Technology, Lund, Sweden

Paper No. GT2006-90622, pp. 1077-1086; 10 pages
doi:10.1115/GT2006-90622
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 6: Turbomachinery, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4241-X | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

This paper presents a numerical investigation of the effect of different back sweep angles and exducer widths on the steady-state impeller outlet flow pattern of a centrifugal compressor with a vaneless diffuser. The investigations have been performed with commercial CFD and in-house programmed 1-D codes. CFD calculations aim to investigate how flow pattern from the impeller is quantitatively influenced by compressor geometry parameters; thereby, the location of wake and its magnitude (flow angle and relative velocity magnitude) are analyzed. Results show that the increased back sweep impeller provides a more uniform flow pattern in terms of velocity and flow deviation angle distribution, and offers better potential for the diffusion process inside a vaneless (or vaned) diffuser. Secondary flux fraction and flow deviation angle from CFD simulation are implemented into the 1-D two-zone program to improve 1-D prediction results.

Copyright © 2006 by ASME

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