Research Papers: Gas Turbines: Industrial & Cogeneration

Setup of an Experimental Facility for the Investigation of Wet Compression on a Multistage Compressor

[+] Author and Article Information
R. Bettocchi, M. Morini, M. Pinelli, P. R. Spina, M. Venturini

Dipartimento di Ingegneria, Università degli Studi di Ferrara, via G. Saragat, 1 44122 Ferrara, Italy

G. Torsello

Dipartimento SSG, R.S.E. SpA, via Rubattino, 54 20134 Milano, Italy

J. Eng. Gas Turbines Power 133(10), 102001 (May 04, 2011) (8 pages) doi:10.1115/1.4002947 History: Received July 30, 2010; Revised October 26, 2010; Published May 04, 2011; Online May 04, 2011

At present, inlet fogging and wet compression are two of the most widely used approaches to enhance gas turbine performance, especially during hot seasons. However, potentially negative effects of these practices on long-term operational integrity of gas turbines should be evaluated carefully; in particular, wet compression may lead to the erosion of first compressor stages due to the impact of water droplets within the flow at compressor intake. This issue is still controversial in technical literature since only limited historical field operating data and information are available. Therefore, a test facility was specifically set up in the laboratories of the University of Ferrara, to evaluate the effects of wet compression on a small-size compressor. This paper presents the experimental facility developed for wet compression investigation and some preliminary results.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Overview of the experimental facility

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Figure 2

Available measured parameters

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Figure 3

Side and front view of the injector

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Figure 4

Mean velocity profile at 50 mm and 200 mm from injector nozzle (drag flow velocity=2 m/s)

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Figure 5

Mean droplet diameter at 50 mm and 200 mm from injector nozzle

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Figure 6

Number of droplets per second at 50 mm and 200 mm from injector nozzle

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Figure 7

Injection system calibration

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Figure 8

Compressor performance maps

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Figure 9

Compressor driving torque

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Figure 10

Compressor isentropic efficiency and total pressure ratio versus corrected mass flow rate

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Figure 11

Compressor inlet and outlet temperatures during a 3 h test (1 injector; n∗=1.00)



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