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TECHNICAL PAPERS: Gas Turbines: Industrial & Cogeneration

Evaluation of Interstage Water Injection Effect on Compressor and Engine Performance

[+] Author and Article Information
I. Roumeliotis1

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

1

Corresponding author.

J. Eng. Gas Turbines Power 128(4), 849-856 (Mar 01, 2004) (8 pages) doi:10.1115/1.2135823 History: Received October 01, 2003; Revised March 01, 2004

The present paper examines the effect of water injection at the compressor inlet or between stages, on its operation. A wet compression model coupled with an engine performance model is used. The wet compression model produces the compressor performance map when water is present and consists of a one-dimensional stage stacking model, coupled with a droplet evaporation model. The effect of water injection on overall performance and individual stage operation is examined. The map-generation procedure is embedded in an engine performance model and a study of water injection effect on overall engine performance is undertaken. The possibility to evaluate the effect on various parameters such as power, thermal efficiency, surge margin, as well as the progression of droplets through the stages is demonstrated. The results indicate that water injection causes significant stage rematching, leading the compressor toward stall and that the performance enhancement is greater as the injection point moves towards compressor inlet.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Compressor map for inlet injection

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Figure 2

Equivalent polytropic efficiency for inlet injection

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Figure 3

Compressor map for third-stage injection

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Figure 4

Compressor map for various injection positions, for 1% of injected water

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Figure 5

Compressor map, with established stall criterion for 1% injected water

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Figure 6

Coupling of stage-stacking model and performance model

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Figure 7

Zooming procedure

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Figure 8

Evaporative profile inside compressor for 5μm diam droplets

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Figure 9

Stages 1 and 15 operating point shift for various injected quantities

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Figure 10

Normalized flow coefficient for First-stage injection

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Figure 11

Normalized flow coefficient for interstage injection

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Figure 12

Compressor operating points for First-stage injection

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Figure 13

Surge margin for First- and Fifth-stage injection

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Figure 14

Gas turbine thermal efficiency and load variation

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Figure 15

EGT and exhaust mass variation

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Figure 16

Thermal efficiency for 2μm and 5μmdiam droplets

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