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TECHNICAL PAPERS: Gas Turbines: Industrial and Cogeneration

Water Injection Effects on Compressor Stage Operation

[+] Author and Article Information
I. Roumeliotis

Laboratory of Thermal Turbomachines,  National Technical University of Athens, Iroon Polytechniou 9, Athens 15773, Greecejroume@ltt.ntua.gr

K. Mathioudakis

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

J. Eng. Gas Turbines Power 129(3), 778-784 (Aug 28, 2006) (7 pages) doi:10.1115/1.2718223 History: Received June 12, 2006; Revised August 28, 2006

In the present paper, experimental work concerning the effect of water injection on a compressor stage is presented. The effect on compressor stage performance and stability is examined for water injection up to 2%. The behavior of the airflow in the blade rows is examined through aerodynamic measurements. The results indicate that although the water injection appears to not have any significant effect on the flow pattern and to stage pressure rise and stall margin, there is a measurable effect on compression efficiency, which seems to result mainly from losses of a mechanical nature and water acceleration. The efficiency degradation is proportional to the water ratio entering the engine.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Compressor stage and nozzle manifold

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Figure 2

Droplet trajectories calculation for inlet bellmouth

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Figure 3

Experimental setup

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Figure 4

Effect of measurement tubing plugging on stage exit static pressure and effect of air purging

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Figure 5

Comparison of measured versus calculated via water to air ratio stage inlet temperature

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Figure 6

Stage map for dry and wet operation (1% water ratio)

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Figure 7

Total static pressure rise coefficient for water injection up to 1.5%

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Figure 8

Total-total pressure rise coefficient for water injection up to 1.5%

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Figure 9

Effect of water injection on stall margin for 1.5% of injected water ratio

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Figure 10

Compressor inlet pressure profile for dry and wet operation (water ratio 1.5%)

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Figure 11

Rotor relative angle turn for 2% water injection ratio

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Figure 12

Total pressure loss coefficient for 2% of injected water ratio

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Figure 13

Stator absolute exit angle for 1.3% of injected water

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Figure 14

Corrected consumed power for dry and wet operation

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Figure 15

Increase of consumed power versus inlet water ratio for a throttling position

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Figure 16

Decrease of compression isentropic efficiency versus stage inlet water ratio

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