TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Analysis of the Effects of Water Injection on the Performance of a Gas Turbine

[+] Author and Article Information
K. Mathioudakis

Department of Mechanical Engineering, Fluids Section, Laboratory of Thermal Turbomachines, National Technical University of Athens, P.O. Box 64069, 15710 Athens, Greece

J. Eng. Gas Turbines Power 124(3), 489-495 (Jun 19, 2002) (7 pages) doi:10.1115/1.1451755 History: Received November 01, 2000; Revised May 01, 2001; Online June 19, 2002
Copyright © 2002 by ASME
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Schematic of the gas turbine layout studied
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Measured quantities on the single shaft gas turbine
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Measured pressure ratio versus pressure ratio predicted by Eq. (2)
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Pressure ratio estimated using dry gas properties (○) and properties altered by water injection (•). Base load w≅1.2.
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Fuel/air ratio for different TIT and w values. Base load.
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Comparison of measured fuel air ratio changes to values predicted by Eq. (4)
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Dependence of power output on turbine inlet temperature, for dry and wet operation
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Change in output power as a function of water/fuel ratio. Points from test data, line form Eq. (5) with Δṁ/ṁ=0. Base load.
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Operation in the region where IGVs are activated. 75 percent load.
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Efficiency decrease due to water injection. Points from test data and line from Eq. (8).
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Gas turbine specific power versus pressure ratio for constant TIT. The “flat” region is indicated.
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Variation of the ratio of turbine power to output power, over a range of operating loads




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