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Compressor/diffuser/combustor aerodynamic interactions in lean module combustors

conference contribution
posted on 28.01.2010, 13:53 authored by Alastair Duncan Walker, Jonathan F. Carrotte, James J. McGuirk
The paper reports an experimental investigation into the possibility of increased interactions between combustor external aerodynamics and upstream components e.g. pre-diffuser, compressor OGV and even the compressor rotor, caused by the trend in lean module fuel injectors to larger mass flows entering the combustor cowl. To explore these component interaction effects, measurements were made on a fully annular rig comprising a single stage compressor, an advanced integrated OGV/pre-diffuser, followed by a dump diffuser and a generic combustor flametube with metered cowl and inner/outer annulus flows. The flow split entering the cowl was increased from 30% to 70%. The results demonstrate that, with fixed geometry, as the injector flow increases, the performance of the pre-diffuser and feed annuli suffer. Pre-diffuser losses increase and at high injector flow rates the diffuser moves close to separation. The substantial circumferential variation in cowl flow can feed upstream and cause rotor forcing. Notable differences in performance were observed inline and between injectors at OGV exit, suggesting that geometry changes such as an increased dump gap or non axisymmetric pre-diffuser designs may be beneficial.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

WALKER, A.D., CARROTTE, J.F. and MCGUIRK, J.J., 2007. Compressor/diffuser/combustor aerodynamic interactions in lean module combustors. IN: Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air, Montreal, 14th-17th May 2007, vol. 6, pp. 1857-1864

Publisher

© ASME

Version

NA (Not Applicable or Unknown)

Publication date

2007

Notes

This item is closed access. It is a conference paper [© ASME ]. For more information on how to obtain this article please visit the ASME Digital Library, http://www.asmedl.org/ .

ISBN

0791847950

Language

en

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