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Analysis of 8 Centrifugal Compressor Impellers Using Two Different CFD Methods: Part II — Blockage and Slip Characteristics

[+] Author Affiliations
JongSik Oh

Korea Institute of Machinery & Materials, Taejon, South Korea

Paper No. 2001-GT-0327, pp. V001T03A029; 8 pages
doi:10.1115/2001-GT-0327
From:
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME

abstract

As the second part of the author’s study, the aerodynamic exit blockage and the slip factor of 8 centrifugal compressor impellers are investigated, when the flow rate is changed from numerical stall to choke, using three-dimensional Navier-Stokes analysis results. Based on all the exit blockage distributions, an improved model equation with two adjusting coefficients is developed for the use in design processes with the agile engineering purpose. A popular expression of simple slip factors, the Wiesner’s equation, cannot be applied in design processes when more accurate prediction is strongly required at design and off-design points. Slip factor variation is found to be also influenced by the blade loadings at midspan. When the flow rate is changed, a pattern of the slip factor variations is assumed to be a simple form which can be explained using midspan blade loading distributions.

Copyright © 2001 by ASME

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