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CFD Predictions of Cascade Pressure Losses Due to Compressor Fouling

[+] Author Affiliations
Dimitrios Fouflias, Aiad Gannan, Kenneth Ramsden, Pericles Pilidis

Cranfield University, Cranfield, England

Paul Lambart

R-MC Power Recovery Ltd., Stamford, Lincolnshire, UK

Paper No. GT2009-59158, pp. 99-108; 10 pages
doi:10.1115/GT2009-59158
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4885-2 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

The performance of the compressor component of an industrial gas turbine can suffer seriously from fouling due to the ingestion of particulate matter like sand and dust. In particular, in very hostile environments when mixed with oil vapour, the outcome is a substantial loss in power and efficiency due to compressor fouling. To recover this performance loss and subject to manufacturer’s firing temperature limitations, the engine fuel flow could be increased. This in turn would reduce the creep life of the turbine blades and result in large increases in engine operating costs. These effects can be reduced markedly by keeping the compressor as clean as possible through a combination of intake filtration and compressor washing. Against this background, the ongoing research involves the design and commissioning of a 2-D cascade tunnel to facilitate estimation of pressure losses and associated compressor inefficiencies as a function of degree of fouling (surface roughness). This paper presents preliminary CFD predictions for smooth clean cascade blades and for fouled blades applying on them different levels of fouling. For all these cases, velocity distributions and exit flow angles one chord downstream of the blades towards the cascade flow stramtube at a midspan height have been investigated. Also the pressure losses associated are presented. All these CFD results will be used to complement the future experimental measurements not yet obtained, which will be undertaken at different fouling level and blade washing scheme as well.

Copyright © 2009 by ASME

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