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TECHNICAL PAPERS: Gas Turbines: Industrial & Cogeneration

Inlet Fogging of Gas Turbine Engines: Experimental and Analytical Investigations on Impaction Pin Fog Nozzle Behavior

[+] Author and Article Information
Mustapha A. Chaker

Research and Development, Mee Industries, Inc., 204 West Pomona Avenue, Monrovia, CA 91016-4526

Cyrus B. Meher-Homji

Turbomachinery Group, Bechtel Corporation, 3000 Post Oak Blvd., MS 73, Houston, TX 77056-6503

Thomas Mee

Mee Industries, Inc., 204 West Pomona Avenue, Monrovia, CA 91016-4526

J. Eng. Gas Turbines Power 128(4), 826-839 (Sep 18, 2006) (14 pages) doi:10.1115/1.1808429 History: Received October 01, 2002; Revised March 01, 2003; Online September 18, 2006
Copyright © 2006 by ASME
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References

Figures

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Distorted spray plume caused by intentional bending of the impaction pin, 138 bar (2000 psi) operating pressure
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Summary curve showing evaporative efficiency for a range of residence times and Dv90 droplet sizes
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Correlation between theoretical model prediction and experimental data
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Droplet size at different rotational angles for the distorted-plume nozzle measured at 1.3 cm (0.5 in.) from the nozzle. Operating pressure is 138 bar (2000 psi).
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Droplet size at different rotational angles for the distorted-plume nozzle measured at 7.6 cm (3 in.) from the nozzle. Operating pressure is 138 bar (2000 psi).
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Cone angle, height, and width of the conical water sheet at the point of atomization
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Sprinkle effect from a standard Mee nozzle at operating pressures from 34 to 103 bar (500 to 1500 psi). The views are facing the impaction pin. Note how sprinkle lessens with increasing operating pressure.
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Standard Mee nozzle spray plumes at operating pressures from 138 to 207 bar (2000 to 3000 psi). Note the absence of larger droplets (sprinkle) at these operating pressures. One can also clearly see that the atomization process begins well before the conical water sheet contacts the support side of the impaction pin.
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Computational model for droplet evaporation
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Evaporation curves for single droplets showing residence time requirements, ending RH, and final droplet sizes for three ambient conditions
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Experimental wind tunnel, 10.5 m (34.5 ft.) long and capable of velocities up to 25 m/s (4900 ft/min). Used to study droplet kinetics and thermodynamics under conditions similar to gas turbine inlet air ducts.
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Wind tunnel experimental setup
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Fog nozzles manifold used to create saturated air in the wind tunnel. The use of a fog droplet filter makes it possible to achieve an airflow with very close to 100% RH.
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Droplet size measurement in the wind tunnel
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Variation of the droplets size as a function of airflow velocity; measurement were taken at 30°C and 40% RH and at 7.6 cm from the nozzle orifice
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Effect of ambient humidity on droplet size at different axial distances from the nozzle at 138 bar (2000 psi) pressure
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Volume distributions showing total injected water, unevaporated water, and evaporated water for ambient conditions of 45°C (113°F) with 5% RH and one second residence time. The curves on the left (a, c, and e) show the volume frequency, and curves on the right (b, d, and f) provide cumulative volume.
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Volume distributions showing injected water, unevaporated water, and evaporated water for ambient conditions of 15°C (59°F) with 80% RH and one second residence time. The curves on the left (a, c, and e) show the volume frequency and curves on the right (b, d, and f) provide cumulative volume.
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Volume frequency of droplets from nozzles located in a low velocity region (filter house). Residence time is 1.2 s.
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Cumulative volume frequency of droplets from nozzles located in the low velocity region (filter house). Residence time is 1.2 s. Evaporation efficiency is 94.4%.
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Volume frequency of droplets for nozzle located in the high velocity region of the duct (after silencers). Residence time is 0.2 s.
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Cumulative volume frequency of droplets from nozzles located in the high velocity region (after the silencers). Residence time is 0.2 s. Evaporation efficiency is 77%.

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