TECHNICAL PAPERS: Gas Turbines: Industrial and Cogeneration

Key Parameters for the Performance of Impaction-Pin Nozzles Used in Inlet Fogging of Gas Turbine Engines

[+] Author and Article Information
Mustapha A. Chaker

Gas Turbine Division,  Mee Industries Inc., Monrovia, CA 91016

J. Eng. Gas Turbines Power 129(2), 473-477 (Feb 01, 2006) (5 pages) doi:10.1115/1.2364006 History: Received October 01, 2005; Revised February 01, 2006

The application of inlet air fogging to gas turbine engines for power augmentation has become common practice, with more than 1000 installations worldwide, including a large number of advanced gas turbines. In this paper an experimental investigation and empirical analysis of key operating parameters on the performance of impaction pin nozzles will be investigated. To date, no such correlation is available for impaction pin nozzles, which are currently used in about 75% of this type of applications. The correlations are developed from a series of experiments conducted in a wind tunnel equipped with the Malvern Spraytec droplet size measurement system. The conducted analysis covered a wide range of the relevant parameters. Mainly, the water flow rate from the nozzle orifice was (0.00126 to 0.00063 ls1: 0.02 gpm to 0.1 gpm), the operating pressure was (34.5 to 204.1 bars: 500 to 3000 psi), the airflow velocity was (1.5 to 15.2 ms1: 295 to 3000 fpm), the distance between the nozzle orifice and the location of measurement was (0.0127 to 0.508 m: 0.5 to 20 in.). Other parameters such as the plume spray cone angle and the surrounding ambient psychrometric conditions, which may affect the droplet size for impaction pin nozzles, is also discussed.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 2

11m long 25ms−1 velocity wind tunnel

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Figure 6

Variation of droplet size as a function of the operating pressure and the location of the measurement in the spray plume. The distance between the nozzle orifice and the measurement position is 0.075m.

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Figure 7

Variation of the droplets size as function of the airflow velocity, at 30°C and 40% RH. The distance between the nozzle orifice and the measurement position is 0.075m.

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Figure 8

Effect of ambient humidity on droplet size at different axial distances from the nozzle at 38 bars (2000psi) pressure

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Figure 9

Effect of flow rate on droplet size

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Figure 10

Effect of plume width on droplet size as a function of airflow velocity

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Figure 5

Droplet size measurement in the wind tunnel

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Figure 4

Fog nozzles manifold

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Figure 3

Wind tunnel experimental setup

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Figure 1

Impaction pin nozzle



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