TECHNICAL PAPERS: Gas Turbines: Advanced Energy Systems

Improved Gas Turbine Efficiency Through Alternative Regenerator Configuration

[+] Author and Article Information
P. A. Dellenback

Department of Mechanical Engineering, University of Wyoming, P.O. Box 3295, Laramie, WY 82071-3295

J. Eng. Gas Turbines Power 124(3), 441-446 (Jun 19, 2002) (6 pages) doi:10.1115/1.1451843 History: Received December 12, 2000; Received September 01, 2001; Online June 19, 2002
Copyright © 2002 by ASME
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Cohen, H., Rogers, G. F. C., and Saravanamuttoo, H. I. H., 1996, Gas Turbine Theory, 4th Ed., Longman Group, Harlow, England.
Bathe, W. W., 1996, Fundamentals of Gas Turbines, 2nd Ed, John Wiley and Sons, New York.
Khartchenko, N. V., 1998, Advanced Energy Systems, Taylor and Francis, Washington, DC.
Wright, I. G., and Stringer, J., 1997, “Materials Issues for High-Temperature Components in Indirectly Fired Cycles,” ASME Paper No. 97-GT-300.


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Schematic of the alternative regeneration cycle
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Performance of various cycles as a function of regenerator pressure drop, with various regenerator effectivenesses (n) shown
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Performance of various cycles as a function of turbine inlet temperature
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The design compromise between engine size and efficiency is a function of regenerator effectiveness (n). The indicated pressure ratios (PRs) have been optimized to yield highest cycle efficiency for each effectiveness.
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Regenerator requirements for the single-shaft configuration at various turbine inlet temperatures, with resulting cycle efficiencies (cyc eff) shown
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Optimum performance of the alternative regeneration cycle usually occurs when the PT is used to supply some of the compressor work requirement in a single-shaft configuration. Calculation is for reference case conditions and overall PR=20.
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Single-shaft alternative regeneration cycle performance for the reference case conditions
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Schematic of a simple cycle incorporating a gas generator and power turbine
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Comparison of various cycle efficiencies for the reference case (turbine inlet temperature=1100°C, combustor and regenerator pressure drops=13.8 kPa, regenerator effectiveness=0.7)
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For lower regenerator effectiveness (n) and larger pressure drops, it is particularly attractive to operate the alternative regeneration cycle in the single-shaft configuration which requires that the power turbine provide some of the compressor work. The overall PR has been optimized for each point shown.



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