In this paper we use experimental measurements to characterize the extent that improved the external aerodynamic performance (reduced total pressure loss, increased flow quality) of a gas-turbine combustion system may be achieved by adopting an integrated OGV/prediffuser technique. Two OGV/prediffuser combinations were tested. The first is a datum design corresponding to a conventional design approach, where the OGV and prediffuser are essentially designed in isolation. The second is an “integrated” design where the OGV blade shape has been modified, following recommendations of earlier CFD work (Final Report No. TT03R01, 2003), to produce a secondary flow/wake structure that allows the prediffuser to operate at a higher area ratio without boundary layer separation. This is demonstrated to increase static pressure recovery and reduce dump losses. Experimental measurements are presented on a fully annular rig. Several traverse planes are used to gather five-hole probe data that allow the flow structure through the OGV, at the inlet and exit of the prediffuser, and in the inner/outer annulus supply ducts to be examined. Both overall performance measures (loss coefficients) and measures of flow uniformity and quality are used to demonstrate that the integrated design is superior.
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January 2007
Technical Papers
Enhanced External Aerodynamic Performance of a Generic Combustor Using An Integrated OGV/Prediffuser Design Technique
A. Duncan Walker,
A. Duncan Walker
Dept. of Aero. and Auto. Engineering,
e-mail: a.d.walker@lboro.ac.uk
Loughborough University Loughborough
, LE11 3TU, United Kingdom
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Jon F. Carrotte,
Jon F. Carrotte
Dept. of Aero. and Auto. Engineering,
Loughborough University Loughborough
, LE11 3TU, United Kingdom
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James J. McGuirk
James J. McGuirk
Dept. of Aero. and Auto. Engineering,
Loughborough University Loughborough
, LE11 3TU, United Kingdom
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A. Duncan Walker
Dept. of Aero. and Auto. Engineering,
Loughborough University Loughborough
, LE11 3TU, United Kingdome-mail: a.d.walker@lboro.ac.uk
Jon F. Carrotte
Dept. of Aero. and Auto. Engineering,
Loughborough University Loughborough
, LE11 3TU, United Kingdom
James J. McGuirk
Dept. of Aero. and Auto. Engineering,
Loughborough University Loughborough
, LE11 3TU, United KingdomJ. Eng. Gas Turbines Power. Jan 2007, 129(1): 80-87 (8 pages)
Published Online: February 1, 2006
Article history
Received:
October 1, 2005
Revised:
February 1, 2006
Citation
Duncan Walker, A., Carrotte, J. F., and McGuirk, J. J. (February 1, 2006). "Enhanced External Aerodynamic Performance of a Generic Combustor Using An Integrated OGV/Prediffuser Design Technique." ASME. J. Eng. Gas Turbines Power. January 2007; 129(1): 80–87. https://doi.org/10.1115/1.2364008
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