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Blade-to-Blade Variability of the Pressure Associated With an Axial Compressor FREE

[+] Author Affiliations
Peter Sherman, Rachel Dudley, Mitchell Suarez

Iowa State University, Ames, IA

Paper No. 95-GT-442, pp. V001T01A107; 9 pages
doi:10.1115/95-GT-442
From:
  • ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Houston, Texas, USA, June 5–8, 1995
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7878-1
  • Copyright © 1995 by ASME

abstract

This work investigates the use of statistical and time/frequency analysis of the downstream pressure signature to characterize blade-to-blade variability of both average and residual pressure associated with a single row 36 blade axial compressor. Analysis of the average pressure signatures suggests that the blade mean pressure signatures are not identical at a 90% significance level. Analysis of the residual signatures, obtained by removing the average signatures, reveals that the wake region contains approximately four times as much power as the core flow region. Time-frequency analysis shows that the strong harmonic content which persists in the residual process is temporally concentrated in the wake flow region, but that the blade-to-blade variability of this narrowband structure is sufficient to be almost eliminated upon averaging of individual blade spectra.

Copyright © 1995 by ASME
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