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Minimisation of Ducted Flow Non-Uniformity Caused by Downstream Blockages

[+] Author Affiliations
M. E. Rife, F. Barbarossa, L. di Mare

Imperial College London, London, UK

A. B. Parry, J. S. Green

Rolls Royce, Derby, UK

Paper No. GT2016-56199, pp. V02AT40A001; 10 pages
doi:10.1115/GT2016-56199
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 2A: Turbomachinery
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4969-9
  • Copyright © 2016 by Rolls-Royce plc

abstract

Flow in annular ducts is sensitive to the presence of downstream blockages which can cause flow non-uniformities propagating far upstream of the blocking body. These effects can be exacerbated in swirling flows where a cascade of uniform guide vanes is present upstream of the blockage. This work uses two- and three-dimensional boundary singularity methods to model and optimise a guide vane cascade geometry to minimise the upstream velocity distortion. Starting from a uniform cascade, the geometry is modified to provide a uniform upstream velocity distribution and minimised blade-to-blade loading in two dimensions. The new geometry is then extrapolated to a three-dimensional annulus. A three-dimensional tool is used to further modify the geometry in three dimensions to minimise the velocity distortion in the whole annulus upstream of the cascade.

Copyright © 2016 by Rolls-Royce plc
Topics: Flow (Dynamics)

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