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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/19066

Title: Annular diffusers with large downstream blockage effects for gas turbine combustion applications
Authors: Walker, Alastair Duncan
Carrotte, Jon F.
Denman, Paul A.
Issue Date: 2011
Publisher: ©2011 by the authors. Published by the American Institute of Aeronautics and Astronautics
Citation: WALKER, A.D., CARROTTE, J.F. and DENMAN, P.A., 2011. Annular diffusers with large downstream blockage effects for gas turbine combustion applications. Journal of Propulsion and Power, 27(6), pp. 1218-1230.
Abstract: In engineering applications, diffuser performance is significantly affected by its boundary conditions. In a gas turbine combustion system, the space envelope is limited, the inlet conditions are generated by upstream turbomachinery, and the downstream geometry is complex and in close proximity. Published work discusses the impact of compressor-generated inlet conditions, but little work has been undertaken on designing diffusers to accommodate a complex downstream geometry. This paper considers the design of an annular diffuser in the presence of a large downstream blockage. This is most applicable in the combustion system of a low-emission landbased aero-derivative gas turbine, where immediately downstream of the diffuser approximately 85% of the flow moves outboard and 15% moves inboard to supply the various flame-tube and turbine-cooling features. Several diffuser concepts are numerically developed and demonstrate 1) the interaction between the diffuser and downstream geometry and 2) how this varies with changes in diffuser geometry. A preferred concept is experimentally evaluated on a low-speed facility that simulates the combustion system and provides compressorgenerated inlet conditions. A conventionally designed aero-derivative diffuser system is also evaluated and, with reference to this datum, the system total pressure losses are reduced by between 20 and 35%.
Description: This paper was published in the Journal of Propulsion and Power and the definitive published version is available at http://dx.doi.org/10.2514/1.B34167
Version: Published
DOI: 10.2514/1.B34167
URI: https://dspace.lboro.ac.uk/2134/19066
Publisher Link: http://dx.doi.org/10.2514/1.B34167
ISSN: 0748-4658
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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AIAA JPP Vol 27-6 Nov 2011 - Walker et al - Annular Diffusers with Large Downstream BLockage Effects for Gas Turbine Combustion Applications.AIAA-56386-820.pdfPublished version14.15 MBAdobe PDFView/Open

 

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