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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Experimental and Computational Study of Hybrid Diffusers for Gas Turbine Combustors

[+] Author and Article Information
A. Duncan Walker, Paul A. Denman, James J. McGuirk

Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leics LE11 3TU, UK

J. Eng. Gas Turbines Power 126(4), 717-725 (Nov 24, 2004) (9 pages) doi:10.1115/1.1772403 History: Received October 01, 2002; Revised March 01, 2003; Online November 24, 2004
Copyright © 2004 by ASME
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References

Figures

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Hybrid pre-diffuser geometry
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Pre-diffuser loading chart
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Measured axial velocity contours at OGV exit
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Axial velocity profile at inlet
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Computational model of vortex-bled diffuser
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Alternative bleed geometries
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Variation of hybrid diffuser pitch-averaged axial velocity profile with bleed
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Axial velocity contours at datum diffuser exit
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Axial velocity contours at hybrid diffuser exit
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Pitch-averaged axial velocity profiles at entry in the inner and outer feed annuli
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Streamline plot, 3% bleed
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Streamline plot, 2.5% bleed
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Momentum analysis nomenclature
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Streamlines, 2.5% bleed
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Contours of −1/ρ ∂p/∂s, 2.5% bleed
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Contours of −((∂/∂)sus2+(∂/∂n)usvn), 2.5% bleed
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Variation of NOx characteristics with engine pressure ratio (Birch 15)
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A typical radially staged combustor
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The hybrid diffuser (Adkins et al. 4)
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Double annular combustor test facility

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