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TECHNICAL PAPERS: Gas Turbines: Electric Power

The Effect of Turbine Blade Cooling on the Cycle Efficiency of Gas Turbine Power Cycles

[+] Author and Article Information
R. C. Wilcock, J. B. Young, J. H. Horlock

Hopkinson Laboratory, Engineering Department, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK

J. Eng. Gas Turbines Power 127(1), 109-120 (Feb 09, 2005) (12 pages) doi:10.1115/1.1805549 History: Received July 10, 2003; Revised September 23, 2003; Online February 09, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic diagram of simple-cycle cooled industrial gas turbine
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Schematic diagram of a cooled turbine stage. Complete mixing is assumed at planes 1, 2, 3, and 4.
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Schematic diagram illustrating the cooling irreversibilities
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Uncooled GT with ηpoly,Cpoly,Tpoly. Contours of constant cycle efficiency ηcyc with contour interval 0.01. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. Dotted lines are loci of Tcot,opt(Tcot for maximum ηcyc at constant rp).
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Cooled GT with “current cooling technology” from Table 1 and ηpoly,Cpoly,Tpolypoly,T refers to an uncooled mainstream expansion). Contours of constant cycle efficiency ηcyc with contour interval 0.01. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. Dotted lines are loci of Tcot,opt(Tcot for maximum ηcyc at constant rp).
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Cycle efficiency cooling penalty Δηcyc for current cooling technology and ηpoly=0.90. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. At each condition (Tcot,rp), the contours represent the difference in cycle efficiency between Figs. 4(c) and 5(c).
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Fractional cooling flowrates ψ for current cooling technology and ηpoly=0.90. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. In (a) ψ is based on the exit flow from the first stator and in (b) on the exit flow from the final stage.
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Cooled GT with “advanced cooling technology” from Table 1. Contours of constant cycle efficiency ηcyc with contour interval 0.01. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. Dotted lines are loci of Tcot,opt(Tcot for maximum ηcyc at constant rp).
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Cooled GT with “super-advanced cooling technology” from Table 1. Contours of constant cycle efficiency ηcyc with contour interval 0.01. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. Dotted lines are loci of Tcot,opt(Tcot for maximum ηcyc at constant rp).
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GT with the “ultimate turbomachinery efficiency” of ηpoly=0.925. Contours of constant cycle efficiency ηcyc with contour interval 0.01. Combustor outlet temperature Tcot=1400–2200 K on abscissa, compressor pressure ratio rp=24–60 on ordinate. Dotted lines are loci of Tcot,opt(Tcot for maximum ηcyc at constant rp).
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Contours of constant ηcyc (contour interval=0.01) with ηpoly,Cpoly,Tpoly. Each plot has Tcot=1400–2200 K on abscissa, rp=24–60 on ordinate. Dotted lines are loci of Tcot for maximum ηcyc at constant rp. Left to right, increasing cooling technology. Bottom to top, increasing turbomachinary ηpoly.

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