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Analysis of 8 Centrifugal Compressor Impellers Using Two Different CFD Methods: Part I — Code Validation

[+] Author Affiliations
JongSik Oh

KIMM(Korea Institute of Machinery & Materials), Taejon, South Korea

SooHyuk Ro

KIAT(Korea Institute of Aerospace Technology), Taejon, South Korea

Paper No. 2001-GT-0326, pp. V001T03A028; 8 pages
doi:10.1115/2001-GT-0326
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

Two different CFD methods, a time marching method and a pressure correction(or based) method, are developed and applied to centrifugal compressor impellers to investigate their validity of applications. 8 impellers are selected for analysis, among which 7 impellers are open to the public, ranging from low to high level of pressure ratio. In all cases, the time marching method gives a satisfactory solution, but the pressure correction method does not. Up to about 18% less level of total-to-total pressure ratio is predicted by the pressure correction method as the level of the impeller pressure ratio increases up to about 10. The drop of total pressure ratio is caused by the underestimation of static pressure rise which seems to be attributed to inappropriate linearization and discretization of the pressure/density coupling terms in the pressure correction equation.

Copyright © 2001 by ASME

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