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Research Papers

Prediction of Evaporative Effects Within the Blading of an Industrial Axial Compressor

[+] Author and Article Information
Charles Matz

 ALSTOM (Switzerland) Ltd., Brown Boveri Strasse 7, CH-5401 Baden, Switzerlandcharles.matz@power.alstom.com

Giovanni Cataldi, Wolfgang Kappis

 ALSTOM (Switzerland) Ltd., Brown Boveri Strasse 7, CH-5401 Baden, Switzerland

Gerd Mundinger

 ABB Turbosystems Ltd., Bruggerstrasse 71a, CH-5401 Baden, Switzerlandgerd.mundinger@ch.abb.com

Stefan Bischoff

 ABB Turbosystems Ltd., Bruggerstrasse 71a, CH-5401 Baden, Switzerlandstefan.bischoff@linde-kryotechnik.ch

Eivind Helland

 ABB Turbosystems Ltd., Bruggerstrasse 71a, CH-5401 Baden, Switzerlandeivind.helland@zurich.com

Matthias Ripken

 Technische Universität Dresden, Helmholtzstrasse 14, D-01062 Dresden, Germanymatthias.ripken@power.alstom.com

J. Turbomach 132(4), 041013 (May 05, 2010) (11 pages) doi:10.1115/1.3149285 History: Received October 19, 2008; Revised November 03, 2008; Published May 05, 2010; Online May 05, 2010

The results of a compressor flow-analysis code calibration study for estimating the effects of water evaporation within the blade rows of industrial axial compressors are presented. In this study, a mean-line code was chosen for the calibration tool due to its accepted use during preliminary design studies, at which time during the compressor design process one would logically consider power augmentation through wet compression. The calibrated code features a nonequilibrium thermodynamic single-droplet evaporation model augmented with an empirical splashing model, which, as input, uses measurements of droplet spectra data taken on water injection nozzles in an intake rig configured with realistic length scales. In addition, a wetted-airfoil-surface flow-angle deviation model is applied to predict changes in compressor stage characteristics, which, in turn, affect the inlet mass flow of the compressor. The test vehicle for calibration was a 50 Hz Alstom industrial gas turbine. Once calibrated, the code was successfully utilized to predict wet-compression effects for three additional like-family Alstom gas turbines operating at constant speed while under full load. The effects modeled by the code include bleed supply pressure suck-down and bleed temperature cool-down effects, as well as compressor inlet mass flow and power consumption effects.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 18

Appreciable water stain on the suction side of blade row 7 of a 60 Hz unit

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Figure 1

Evaporating droplet depicting heat and mass fluxes

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Figure 2

Single-droplet model first attempt: No radiation heat transfer from walls of the electric furnace modeled

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Figure 3

Single-droplet model second attempt: Radiation heat transfer from walls of the electric furnace modeled

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Figure 4

Inertial effect of droplet of a certain size striking airfoil pressure surface

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Figure 5

Differential blade surface element showing droplet impact frequency from a droplet of a certain size

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Figure 9

Modeling of mass flow at 100% ambient relative humidity

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Figure 10

Modeling of mass flow at 80% ambient relative humidity

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Figure 11

Compressor axial water distribution at 100% ambient relative humidity

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Figure 12

Compressor axial water distribution at 80% ambient relative humidity

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Figure 15

Interstage temperature data utilized to predict bleed-cavity cool-down effects

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Figure 16

Compressor power consumption comparison

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Figure 17

Compressor axial water distribution on a 60 Hz field unit

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Figure 6

Schematic of virtual evaporation device

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Figure 7

h-s diagram detailing entropy decreases from evaporation

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Figure 8

Schematic of mean-line boundary conditions

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Figure 13

Modeling of bleed supply pressure at 100% ambient relative humidity

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Figure 14

Modeling of bleed supply pressure at 80% ambient relative humidity

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Figure 19

Water stain on the suction side of blade row 8 of a 60 Hz unit

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Figure 20

Absence of water stains on blade row 9 of a 60 Hz unit

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