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Performance Evaluation of Non-Uniformly Fouled Axial Compressor Stages by Means of Computational Fluid Dynamic Analyses

[+] Author Affiliations
Nicola Aldi, Mirko Morini, Michele Pinelli, Pier Ruggero Spina, Alessio Suman, Mauro Venturini

Università degli Studi di Ferrara, Ferrara, Italy

Paper No. GT2013-95580, pp. V05BT24A016; 11 pages
doi:10.1115/GT2013-95580
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 5B: Oil and Gas Applications; Steam Turbines
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5520-1
  • Copyright © 2013 by ASME

abstract

In this paper, three-dimensional numerical simulations are carried out to evaluate the effect of fouling on an axial compressor stage. A numerical model of the NASA Stage 37, validated in previous papers of the same authors against experimental data available from literature, is used as a case study.

The occurrence of fouling is simulated by imposing different spanwise distributions of surface roughness, in order to analyze its effect on compressor performance. To this aim, both the stage performance maps of the fouled compressor and the spanwise distribution of work and losses are analyzed and discussed. Moreover, the definition of an averaged roughness parameter is suggested, to characterize the different roughness distributions.

The results show that the drop of overall performance can actually be predicted by means of the numerical model. Moreover, detailed information about fluid-dynamic phenomena can be analyzed on the basis of the actual distribution of surface roughness on rotor blades.

Copyright © 2013 by ASME

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