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Research Papers: Gas Turbines: Industrial & Cogeneration

Development and Validation of a Computational Code for Wet Compression Simulation of Gas Turbines

[+] Author and Article Information
M. Bagnoli, M. Bianchi, F. Melino

DIEM, University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy

P. R. Spina

ENDIF, University of Ferrara, Via Saragat, 44100 Ferrara, Italy

It should be observed that, considering a spray, the injected droplets are characterized by a certain diameters distribution. In order to represent this distribution some parameters, such as Sautern mean diameter (SMD) (defined as the ratio of total injected droplets volume to surface area), mean diameter, etc., can be used.

J. Eng. Gas Turbines Power 130(1), 012004 (Jan 11, 2008) (8 pages) doi:10.1115/1.2771563 History: Received October 16, 2006; Revised October 17, 2006; Published January 11, 2008

In this paper, a calculation code, developed in house by the authors, able to evaluate the performance of a gas turbine with all possible fogging strategies (high pressure fogging, overspray, and interstage injection) is presented and discussed. The code has a flexible structure and can be applied to evaluate the performance of every commercial gas turbine model. The aim of the calculation code is to overcome the limits of the most widespread commercial software, especially with regard to the two phase flow compression process simulation. The calculation code was validated on results available in the literature showing a good agreement with experimental and theoretical results.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Scheme of a water droplet exchanging heat and mass with the surrounding air

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Figure 2

Model adopted for compressor stage wet compression calculation

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Figure 3

Main program (MAIN) flow chart

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Figure 4

Generalized stage characteristics ψp*=Fψ(ϕ*,SF) and experimental data points (17)

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Figure 5

Generalized stage efficiency curve (17)

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Figure 6

Power relative variation versus injected water to air ratio: experimental data (circle marker), Utamura (6) calculation (red dotted line), and IN.FO.G.T.E. code calculation (blue continuous line)

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Figure 7

Efficiency relative variation versus injected water to air ratio: experimental data (circle marker), Utamura (6) calculation (red dotted line), and IN.FO.G.T.E. code calculation (blue continuous line)

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Figure 8

Evaporated water to injected water ratio through the compressor for a GE F9E gas turbine: Utamura (6) calculation (red dotted line) and IN.FO.G.T.E. code calculation (blue continuous line)

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Figure 9

Normalized flow coefficient change at the stage inlet as calculated by White and Meacock (10) (red dotted lines) and by IN.FO.G.T.E. code (blue continuous lines) versus stage number and water to air ratio: 1% (a), 2% (b), and 5% (c)—Reference: 15°C, 1.013bar, 100% RH, DD=5μm

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Figure 10

Compressor pressure ratio change as calculated by White and Meacock (10) (red dotted line) and by the developed calculation code (blue continuous line) versus water to air ratio

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