TECHNICAL PAPERS: Gas Turbines: Industrial and Cogeneration

Inlet Fogging of Gas Turbine Engines—Part II: Fog Droplet Sizing Analysis, Nozzle Types, Measurement, and Testing

[+] Author and Article Information
Mustapha Chaker, Cyrus B. Meher-Homji, Thomas Mee

Gas Turbine Division, Mee Industries, Inc., 204 West Pomona Avenue, Monrovia, CA 91016

J. Eng. Gas Turbines Power 126(3), 559-570 (Aug 11, 2004) (12 pages) doi:10.1115/1.1712982 History: Received December 01, 2001; Revised March 01, 2002; Online August 11, 2004
Copyright © 2004 by ASME
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Impaction-pin droplet size experimental results for still air, operating pressure 2000 psig (138 barg) (a, b); impaction-pin droplet size experimental results for airflow velocity of 900 fpm (4.6 m/sec) operating pressure 2000 psig (138 barg) (c, d); swirl-jet nozzle droplet size experimental results for still air, operating pressure 2000 psig (138 barg) (e, f )
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Data check for repeatability showing consistency in diameters
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(a) Experimental setup, in still air and (b) wind tunnel section showing Malvern Spraytec measurement system for nozzle testing under airflow conditions
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Two droplet measurement histograms showing the importance of the use of both SMD and Dv90. Data is from actual experiments done on nozzles
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Swirl and impaction-pin nozzles
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Visual plume shape of different makes of impaction-pin nozzles at an operating pressure of 138 barg (2000 psig). Mee nozzle (152 micron orifice, 316 stainless steel construction) in the center
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Various impaction-pin nozzles, from 147-micron (on right) to 457-micron orifice diameter (left), operating pressure 138 barg
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Impaction-pin nozzle showing small shading effect from impaction pin
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Opposite view of the nozzle shown in Fig. 6
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Spatial location for experimental testing
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Experimental measurements showing influence of flow velocities and measurement distances on droplet sizes, operating pressure: 138 barg
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(a, b) Experimental results of droplet size distribution in the plume for comparable swirl and impaction-pin nozzles
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Experimental comparisons between impaction and swirl-jet nozzles at varying pressures. Measurements of both Dv90 and D32 have been taken at different locations in the plume. The graph shows that the impaction-pin nozzle provides smaller diameters regardless of where measured
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Plume characteristics of impaction-pin (left) and swirl-jet type nozzles (right) at operating pressure of 137 barg. The smoke-like nature of the impaction-pin nozzle is evident. The straight edge of the swirl-jet nozzle is indicative of the high momentum of the larger droplets, implying a much larger droplet size at the edges as also indicated by the graphs above




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