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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/5883

Title: Compressor/diffuser/combustor aerodynamic interactions in lean module combustors
Authors: Walker, Alastair Duncan
Carrotte, Jonathan F.
McGuirk, James J.
Issue Date: 2007
Publisher: © ASME
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
Abstract: 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.
Description: 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/ .
Version: Closed access
DOI: 10.1115/GT2007-27872
URI: https://dspace.lboro.ac.uk/2134/5883
ISBN: 0791847950
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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