TECHNICAL PAPERS: Gas Turbines: Controls, Diagnostics, and Instrumentation

Uncertainty Reduction in Gas Turbine Performance Diagnostics by Accounting for Humidity Effects

[+] Author and Article Information
K. Mathioudakis, T. Tsalavoutas

Laboratory of Thermal Turbomachines, National Technical University of Athens, Iroon Plolytechniou 9, Athens 15773, Greece

J. Eng. Gas Turbines Power 124(4), 801-808 (Sep 24, 2002) (8 pages) doi:10.1115/1.1470485 History: Received December 01, 2000; Revised March 01, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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Deviation of modification factors if humid air data are processed by adaptive model with dry air
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Layout of the SULZER TYPE 10 gas turbine and quantities measured for monitoring
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Daily variations of ambient conditions over a period of a week
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Ambient conditions over a period of a week
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Referred measured quantities for low and high humidity level. Points around Instants A▪ and B•, Fig. 9.
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Comparison of predicted and measured differences for operating conditions of low and high ambient humidity (Instants A and B of Fig. 9)
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Health indices deviation for different levels of humidity, when f1,f2,f5,f6, and f7 are estimated from N1, CDP, CDT, EGT, and W2
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Compressor flow capacity evaluated (a) with a standard humidity of 60%, (b) using actual measured humidity
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Compressor flow capacity, resulting from fouling, and the effect of compressor washes
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Power turbine swallowing capacity evaluated (a) with a standard humidity of 60%, (b) using actual measured humidity
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Layout of twin shaft gas turbine, used for constituting a component based performance model
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Measurement deviations: (a) WAR=0.009 (b) IGV fault. Signatures for N1 constant.
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Interrelation of compressor delivery temperature and power output for different relative humidity levels, and related uncertainty bands
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Percentage change of referred quantities for constant referred load
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Percentage change of performance related quantities, in function of water/air ratio. Changes evaluates at constant (a) power output, (b) TIT, (c) EGT.



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