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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

Lefebvre,  A. H., 1995, “The Role of Fuel Preparation in Low-Emission Combustion,” ASME J. Eng. Gas Turbines Power, 117, pp. 617–654.
Carrotte, J., and Barker, A. G., 1994, “Annular Dump Diffuser Systems, Part II: The Combined Effect of Shortened Pre-Diffusers and Dump Gap Variation,” Internal Report TT95R03, Dept. AAE, Loughborough University.
Fishenden,  C. R., and Stevens,  S. J., 1977, “Performance of Annular Combustor-Dump Diffuser,” J. Aircr., 14, pp. 60–67.
Adkins,  R. C., Matharu,  D. S., and Yost,  J. O., 1981, “The Hybrid Diffuser,” ASME J. Eng. Gas Turbines Power, 103, pp. 229–236.
Walker, A. D., 2002, “Experimental and Computational Study of Hybrid Diffusers for Gas Turbine Combustors,” Ph.D. thesis, Loughborough University.
Adkins, R. C., and Yost, J. O., 1983, “A Compact Diffuser System for Annular Combustors,” ASME Paper 83-GT-43.
Denman, P. A., 2002, “Aerodynamic Evaluation of Double Annular Combustion Systems,” ASME Paper GT-2002-30465.
Wray, A. P., and Carrotte, J. F., 1993, “The Development of a Large Annular Facility for Testing Gas Turbine Combustor Diffuser Systems,” Paper No. AIAA-93-2546.
Sovran, G., and Klomp, E. D., 1967, “Experimentally Determined Optimum Geometries for Rectilinear Diffusers With Rectangular, Conical or Annular Cross-Section,” Fluid Mech. Of Internal Flow, Elsevier, New York, pp. 270–319.
Klein,  A., 1995, “Characteristics of Combustor Diffusers,” Prog. Aerosp. Sci., 31, pp. 171–271.
Launder,  B. E., and Spalding,  D. B., 1974, “The Numerical Computation of Turbulent Flows,” Comput. Methods Appl. Mech. Eng., 3, pp. 269–289.
Ferziger, J. H., and Peric, M., 2001, Computational Methods for Fluid Dynamics, Springer-Verlag, Berlin.
Adenubi,  S. O., 1976, “Performance and Flow Regime of Annular Diffusers With Axial Turbomachine Discharge Inlet Conditions,” ASME J. Fluids Eng., 98, pp. 236–243.
Barker,  A. G., and Carrotte,  J. F., 2001, “Influence of Compressor Exit Conditions on Combustor Annular Diffusers—Part II: Flow Redistribution,” J. Propul. Power, 17(3), pp. 687–694.
Birch,  N. T., 2000, “2020 Vision: The Prospects for Large Civil Aircraft Propulsion,” Aeronaut. J., 104(1038), pp. 347–352.

Figures

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Double annular combustor test facility
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The hybrid diffuser (Adkins et al. 4)
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A typical radially staged combustor
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Variation of NOx characteristics with engine pressure ratio (Birch 15)
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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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