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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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Figures

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Schematic of the alternative regeneration cycle
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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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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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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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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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Single-shaft alternative regeneration cycle performance for the reference case conditions
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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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